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Results 961 to 990 of 5716:

The control of soil-borne fungal pathogens in grapevine nurseries in Türkiye and their impact on sapling qualityOriginal Paper

Nurdan Gungor Savas

Plant Protect. Sci., 2024, 60(3):241-257 | DOI: 10.17221/94/2023-PPS

In the production of grafted vines, losses are caused by fungal pathogens during callus forming or after planting in the soil. To control or reduce natural soil-born fungal infections in nurseries, certain applications were conducted in the sapling cultivation stage to analyse the efficacy of cyprodinil + fludioxonil, fluopyram + tebuconazole active substances, and Trichoderma harzianum biological preparation: 1103 Paulsen rootstock and Vitis viniferea L. cv. In the study, Sultana cultivars were stored in fungicide suspensions for 60 min before and after grafting. After grafting, the saplings were divided into (i) cutting + sawdust (ii) cutting + sawdust + soil application groups and transferred to the callus room. After nine months in the nursery, the plants were uprooted, classified as diseased or healthy, and analysed for morphological and molecular diagnosis of fungal species, isolation incidence, and sapling quality and yield. Boeremia exigua var. exigua was isolated for the first time from cuttings during grapevine sapling production and was first registered in NCBI Genbank. After callus development, Fusarium solani was most frequently isolated pathogen in the roots (21.5%); cyprodinil + fludioxonil reduced the Ilyonectria sp. isolation rate in both shoots and roots. Botryosphaeria dothidae and I. liriodendri pathogens were not detected in disease and healthy cyprodinil + fludioxonil treated saplings. The highest sapling yield was observed in fludioxonil + cyprodinil, cutting + sawdust + soil (78.75%) and cutting + sawdust (70.63%) applications.

Cryopreservation of early-stage male Black Sea trout (Salmo trutta labrax) germ cells and comparison of the whole tissue and enzymatically isolated cellsOriginal Paper

Ege Güngör, Aygül Ekici, Merve Erçin, Selda Oktayoğlu, Taiju Saito, İlker Keskin

Czech J. Anim. Sci., 2024, 69(8):331-343 | DOI: 10.17221/71/2024-CJAS


The high plasticity, or the ability to differentiate into various cell types, and capacity to become both gametes of early-stage germ cells (eGCs) allows them to be used for the long-term storage and recovery of genetic information. In this study, species-specific protocols (isolation period, enzymatic separation solution, incubation period, appropriate cryoprotectant, and cryopreservation protocol) were established for the isolation and long-term preservation of Black Sea trout eGCs. In addition, the difference between the application of cryopreservation to the whole gonad tissue and to the enzymatically separated cells has been shown in terms of viability and the number of cells obtained. According to the cell count made from the histological sections of the testicular tissue throughout the year, the period with the highest concentration of eGCs in the tissue is between May and June. To identify the optimal enzymatic dissociation solution, we subjected testicular tissues to digestion using various combinations of trypsin (T) and collagenase (C) (0.3–0.5% T and 0.1–0.3% C). Our findings revealed that the 0.3% C provided the highest yield of viable cells (90.9%). We cryopreserved the enzymatically dissociated cells (EDCs) using six different cryoprotectants (Dimethyl sulfoxide, Glycerol, and CryoSOfree™, in both L-15 and phosphate-buffered saline – PBS mediums). Additionally, whole tissue exclusively with CryoSOfree™. After storing the samples at –152 °C for two years, the group of EDCs cryopreserved in L15+Glycerol exhibited the highest viability at 93.3%. Meanwhile, the whole tissue group yielded the greatest number of cells per ml after thawing, with a count of 33 210 000 cells. When considering both the viability (91.11%) and the number of cells obtained (33 210 000 cells/ml), the whole tissue cryopreservation group outperformed all the other methods.

Molecular identification of yellow rust resistance genes in some wheat and triticale cultivars and their resistance to Puccinia striiformis f.sp. triticiOriginal Paper

Emad Mahmood Al-Maaroof*, Sarkawt Hama Salih Ali

Czech J. Genet. Plant Breed., 2024, 60(4):223-236 | DOI: 10.17221/39/2024-CJGPB

Yellow rust (YR), caused by Puccinia striiformis f.sp. tritici (Pst), is a global threat to wheat production. In this study the response of 46 wheat and triticale cultivars to Pst at the adult plant stage (APS) was evaluated during two successive growing seasons at Sulaimania, Iraq. Also, we used a molecular analysis to find the yellow rust resistance (Yr) genes present in the individual cultivars. The results revealed large differences in the response to Pst between the cultivars. Most of the cultivars were susceptible to YR; the mean coefficients of infection (CI) varied from 0.23 in cv. Sarah to 83.33 in Hsad. High resistance levels were found in Al-Wand, Kalar 1, Rezan, and Sarahat APS, while Al-Rashid, Charmo, Faris 1, Maaroof, Rabiea, and Iratom displayed moderate resistance. The level of Yellow rust infection was higher in 2023 than in 2022 in most tested cultivars. Molecular analysis revealed the highest number of Yr genes (Yr2, Yr5, Yr7, Yr9, Yrvav, Yr15, Yr24, Yr26, and Yr32) in the cv. Al-Wand, followed by Sulaimani 2 with eight Yr genes (Yr2, Yr5, Yr7, Yr9, Yr15, Yr24, Yr26, and Yr32). Only one Yr gene was found in Iratom and Tamuz 3. Yr2 was the most frequently identified gene, present in the majority of tested cultivars (87%), followed by Yr7 (76%) and Yr9 (74%), respectively.

How does urbanisation affect agricultural economic resilience? Evidence from ChinaOriginal Paper

Ruihan Wang, Zheng Lu, Chunyu Tang

Agric. Econ. - Czech, 2024, 70(10):513-526 | DOI: 10.17221/207/2024-AGRICECON

As an important path to breaking the urban-rural dual system and promoting agricultural modernisation in China, the process of urbanisation might have a strong influence on promoting agricultural economic resilience (AER). Using panel data from provincial-level administrative regions of China’s mainland, we constructed a novel indicator system to measure AER, and employ the system generalised method of moments model to examine the impact of urbanisation on AER and the moderating roles of land transfer and heterogeneous human capital. Our study yielded three notable findings. First, the urbanisation process can significantly enhance AER. This finding remained robust after conducting multiple robustness tests and addressing endogeneity using the instrumental variable method. Second, the influencing mechanism analysis results indicated that land transfer and human capital had significant moderating roles, and the level of land transfer and educational improvement can enhance the positive impact of urbanisation on AER, while the migratory human capital weakened this positive effect. Third, the heterogeneity analysis revealed regional differences in the impact of urbanisation on AER, demonstrating that the promotional effect of urbanisation was much greater in the major grain-producing areas. Our study offers a new perspective and evidence for researchers and policymakers investigating how to enhance AER.

Biochar distribution mode in soil affects the vegetative peanut growth, nitrogen uptake and nitrogen-fixing bacteria activityOriginal Paper

Xiangzhu Wang, Man Wu, Chengbin Sun, Miao Liu, Liyu Yang, Haiyan Liang, Qi Wu, Pu Shen

Plant Soil Environ., 2024, 70(12):783-798 | DOI: 10.17221/228/2024-PSE

Biochar plays an important role in agricultural production as it can improve soil fertility, promote nutrient adsorption and enhance plant growth. However, the distribution of biochar in the soil significantly impacts its application effect. In order to investigate the impact of non-uniform biochar distribution on soil nutrient uptake, root shape, peanut development, and the makeup of soil microbial communities, we carried out greenhouse peanut pot studies. This experiment followed a completely randomised design with four treatments, each with three replications. The four treatments were as follows: no biochar application (B0); concentrated biochar application near seeds (B1); relatively concentrated surface application of biochar (B2), and uniformly dispersed application of biochar (B3). The findings demonstrated that, compared to the no-biochar scenario, the aboveground and root nitrogen uptake was significantly (P < 0.05) improved by the B2 treatment, increasing by 42.79% and 51.39%, respectively, compared to the control group. Additionally, it reduced the concentrations of NO3-N and NH4+-N in the soil. The B2 treatment also significantly (P < 0.05) increased the net photosynthetic rate and aboveground dry matter weight, increasing by 196.85% and 53.96%, respectively, compared to the B0 treatment. The B1 and B3 treatments also demonstrated a higher promoting effect. The growth of the root system and the quantity of root nodules were promoted by the addition of biochar. The number of root nodules in the B2 treatment was 72.22% higher than that in the control group. In terms of microbial and bacterial communities, the addition of biochar increased the number of nitrogen-fixing bacteria to a certain extent, while the relative abundance of soil bacterial communities showed no significant differences. In general, the non-uniform distribution of biochar in the soil significantly affected peanuts’ vegetative growth and developmental effects. The relatively concentrated surface application of biochar treatments contributes to improving plant nutrient uptake and root system development. This provides a more effective application method for agricultural personnel to apply biochar fertiliser in the future.

Application of the physical properties of local cowpea varieties in the development of a multi-variety cowpea cleanerOriginal Paper

Babatunde Olusola Adetifa, Elizabeth Ayobami Olumomi, Taiwo Moses Samuel, Ayoola Abiola Babalola

Res. Agr. Eng., 2024, 70(2):82-91 | DOI: 10.17221/51/2023-RAE

Cowpea, an annual legume widely grown and consumed in Nigeria, has been observed to contain between 27–33% impurities when freshly harvested and threshed. This poses a threat to humans when consumed and in large-scale agricultural processing. Therefore, this study is aimed at developing and evaluating the performance of a multi-variety cowpea cleaner (MVCC). Using standard methods, some selected engineering properties of the cowpea varieties were examined and used in the design of the MVCC. The cowpea had a moisture content of 8–14%, depending on the locations and varieties. Other properties investigated include the length, width, thickness, sphericity, geometric mean diameter, unit volume, arithmetic mean diameter, aspect ratio, surface area, unit weight, true density, terminal velocity, and angle of repose. The MVCC comprised the hopper, winnower, cleaning unit, fan assembly, and frame. The performance of the MVCC was also evaluated. The efficiency of separating good products of honey, drum, and Sokoto White beans was 95, 91, and 84%, respectively, while separating bad products was 87, 94, and 96%, respectively.

Does the payment method matter in online shopping behaviour? Study on the Romanian market of vegetables during the pandemic crisisOriginal Paper

Ioan-Sebastian Brumã, Cristina Cautisanu, Lucian Tanasã, Simona-Roxana Ulman, Meda Gâlea, Alexandra Raluca Jelea

Agric. Econ. - Czech, 2024, 70(1):34-47 | DOI: 10.17221/314/2023-AGRICECON


The present study, centred on customer online shopping behaviours, aims at analysing the frequency of vegetable acquisition and its main determining factors, while considering different methods of payment, i.e. cash, debit card, and bank transfer on the Romanian market. Using data obtained from a questionnaire applied nationwide, a descriptive analysis and logistic regression were performed. An immature market in terms of digitalisation, characterised by the customers’ mistrust in online bank transfers, but also in products sold online was observed. In addition, the income, education, gender, and size of the household appeared to be significant in relation to the frequency of online orders for vegetables. Moreover, our results indicated that a higher customer readiness for a high price, large quantity, and a monthly delivery subscription comes bundled with a higher frequency of acquisition in the case of bank transfers. Our findings are especially focusing on the vegetable local producers’ promotion process, with its main desideratum of properly responding through adaptation to the continuously changing customers’ requirements, particularly when special contexts like the pandemic appear. Accordingly, our paper intended to offer several concrete responses in this regard, indicating some possible paths for better managing the communication process on the vegetable market.

Corporate social responsibility and the relationship to stakeholders in large agricultural holdings in the Czech RepublicOriginal Paper

Marie ©impachová Pechrová, Ondøej ©impach

Agric. Econ. - Czech, 2024, 70(4):155-164 | DOI: 10.17221/369/2023-AGRICECON


Corporate social responsibility (CSR) is also implemented in agriculture, where larger agricultural holdings have a higher influence. We focused on them and situated our study to a country with a large average farm acreage – the Czech Republic. The aim of the paper is to assess to what extent large agricultural holdings perceive socially responsible behaviour as being important and how it is manifested in their relationship to the stakeholders and the behaviour in economic, social and environmental areas using Carroll’s pyramid and concept of 3 ‘P’. It is also examined if the higher perception of CSR influences the assets. Firms were grouped according to the perceived CSR by a cluster analysis. The highest economic responsibility in cluster 1 corresponded to the relatively high value of the assets, but the highest was in cluster 2 and 3 with important legal and ethical responsibilities. Cluster 4 had the lowest CSR, the same as the value of the assets, but further investigation is needed. The most important stakeholders were the owners and employees, but also the range of activities was provided for the locals. CSR and the importance of the stakeholders in large Czech agricultural holdings were highly perceived, especially on an economic level and in the social area.

Temporal changes of soil characteristics on Lítov spoil heap, Czech RepublicOriginal Paper

Enkhtuya Enkhtaivan, Oldøich Vacek, Petra Vokurková, Marko Spasiæ, Radim Va¹át, Ondøej Drábek

Soil & Water Res., 2024, 19(3):133-143 | DOI: 10.17221/17/2024-SWR

This study aimed to examine the changes in selected soil properties at Lítov spoil heap (Sokolov, Czech Republic) and compare the current situation with the situation described twenty years ago. A total of 110 soil samples were taken at Lítov at the same sites as in 1998. The analyses of basic soil characteristics involved: exchangeable soil pH (pHKCl), organic carbon content (Cox), quality of humic substances (A400/A600), exchangeable acidity (Ea), and two types of aluminium contents in the soil. Changes in all soil characteristics between 1998 and 2018 were statistically evaluated, compared, and visualized using Geographical Information Systems (GIS). We have observed an increase of pHKCl, Cox and a slight improvement in humus quality compared to the results from 1998. The temporal changes of soil characteristics were evident in the whole area, and the influence of reclamation methods was also pronounced. Soil development close to the regional common natural conditions was found in the area where agricultural reclamation measures (i.e., covering with topsoil) were carried out. Furthermore, afforestation – mainly by deciduous trees – supported the improvement of soil characteristics favourable for plant growth. High pyrite content and marshland were identified as the main causes that led to vegetation cover mortality.

Effect of the combination of nitrapyrin and gamma-aminobutyric acid on soil nitrogen transformation characteristics and rice yieldOriginal Paper

Furong Xiao, Chen Feng, Dongpo Li, Lili Zhang, Yonghua Li, Yandi Du, Yan Xue, Ping Gong, Yuchao Song, Ke Zhang, Yiji Zhang

Plant Soil Environ., 2024, 70(8):509-522 | DOI: 10.17221/95/2024-PSE

When 2-chloro-6-(trichloromethyl) pyridine (nitrapyrin) is applied alone, it typically does not significantly increase crop yield. Therefore, we combined gamma-aminobutyric acid (GABA) with nitrapyrin to address the limitations of nitrapyrin in enhancing yield. We conducted indoor incubation experiments and pot experiments in Chernozem and Calcic Kastanozem, respectively. The results demonstrated that GABA exerted an influence on the effectiveness of nitrapyrin by altering its degradation rate. In Chernozem, GABA accelerated nitrapyrin degradation, whereas, in Calcic Kastanozem, the results were the opposite. The pot experiment results showed that the combination of nitrapyrin and GABA increased rice total biomass by 5%, grain yield by 18 ± 2%, and plant nitrogen (N) uptake by 9 ± 1% compared to nitrapyrin applied alone. The increase in yield was attributed to the combined effect of nitrapyrin and GABA, which elevated root biomass and leaf area. In contrast, the effect of GABA on yield through altering the degradation rate of nitrapyrin was weaker. Therefore, the combination of nitrapyrin and GABA combined with urea increases rice yields in Chernozem and Calcic Kastanozem. The aim of this endeavour was to foster the development of a novel fertiliser product that offers both favourable agronomic outcomes and environmental benefits.

The impact of parity, litter size and birth weight variations within a litter on piglet pre-weaning performanceReview

Nqobile Lungile Buthelezi, Bohani Mtileni, Khathutshelo Agree Nephawe, Peter Ayodeji Idowu, Mamokoma Catherine Modiba, Hezekiel Mpedi, Takalani Judas Mpofu

Czech J. Anim. Sci., 2024, 69(7):255-268 | DOI: 10.17221/36/2024-CJAS

Sows are selected for their prolificacy. Therefore, assessing difficulties that can be associated with large litters is crucial. This review aims to highlight the factors that can affect reproductive performance such as breed, parity, litter size, environment, and nutrition. Understanding these factors can help producers make informed decisions about sow management and other aspects. Higher within-litter variation is the result of  a  high number of piglets born. It has been determined that large litter sizes pose a risk to animal welfare in the pig industry. Moreover, large litters bring more piglets with low birth weight leading to high pre-weaning losses. Lighter littermates struggle to get enough colostrum due to the competition with heavy littermates, which lowers their chances of survival causing high mortality. Larger litters may cause greater stress and discomfort of the sow. Therefore, applying stress-free environment and treating the sow with anti-inflammatory compounds may enhance the sow performance and consequent survival of piglets. The litter size is positively correlated with the variation in birth weight within a litter, while the average weight at birth is negatively related to litter size. Producers should therefore focus on potential management strategies that can improve piglet performance, survival and welfare such as proper supervision and adequate colostrum intake. This review highlights the historical development of the pig industry and literature on the variation in piglet weight at birth within a litter, factors influencing weight at birth, and the potential effects on the piglet performance before weaning. Also, the difficulties amongst large litters and possible strategies for managing survival in large litters were also reviewed.

Control of odour and gaseous emissions from livestock buildings: Recent research and developmentsReview

Roger Jay Lamadrid De Vela

Res. Agr. Eng., 2024, 70(4):181-197 | DOI: 10.17221/55/2024-RAE

One major challenge in the continuous growth of the livestock industry is the increased emission of odorous gases, which is not just a nuisance but also a cause of serious health and environmental concerns. Several strategies which aim to: (i) reduce the formation of odorous gases; (ii) enhance dispersion of odour; (iii) capture odour and gases to prevent escape to the environment; and (iv) reduce odour and gaseous concentrations, are developed. These are achieved with the use or employment of one or more of: (i) diet manipulation techniques; (ii) additives and adsorbents; (iii) covers; (iv) shelterbelts or windbreaks; (v) ventilation systems; (vi) biofilters; and (vii) air scrubber. The advantages and limitations of each of these strategies are discussed in this review in order to guide the choice of which strategy to use in a specific livestock application. Moreover, this review also discusses potential researchable areas in the field of odour control in livestock facilities.

Comparison of the machine learning and AquaCrop models for quinoa cropsOriginal Paper

Rossy Chumbe, Stefany Silva, Yvan Garcia

Res. Agr. Eng., 2023, 69(2):65-75 | DOI: 10.17221/86/2021-RAE

One of the main causes of having low crop efficiency in Peru is the poor management of water resources; which is why the main objective of this article is to estimate the amount of irrigation water required in quinoa crops through a comparison between the machine learning and AquaCrop models. For the development of this study, meteorological data from the province of Jauja and descriptive data of quinoa crops were processed and a simulation period was established from June to December 2020. From the simulation carried out, it was determined that the best model to predict the required irrigation water is the Adaptive Boosting (AdaBoost) model in which it was observed that the mean and standard deviation of the AdaBoost models (mean = 19.681 and SD = 4.665) behave similarly to AquaCrop (mean = 19.838 and SD = 5.04). In addition, the result of ANOVA was that the AdaBoost model has the best P-value indicator with a value of 0.962 and a smaller margin of error in relation to the mean absolute error (MAE) indicator with a value of 0.629. Likewise, it was identified that, for the simulation period of 190 days, 472.35 mm of water was required to carry out the irrigation process in red quinoa crops.

Potential of mixed Picea abies (L.) Karst. and Pinus sylvestris L. forests in lowland areas of Central BohemiaOriginal Paper

Pavel Brabec, Jakub Brichta, Zdenìk Vacek, Stanislav Vacek, Václav ©imùnek, Vojtìch Hájek

J. For. Sci., 2023, 69(11):470-484 | DOI: 10.17221/76/2023-JFS

Mixed forests play a key role in terms of stability, production potential, and adaptation to climate change. In addition, the studied Norway spruce [Picea abies (L.) Karst.] and Scots pine (Pinus sylvestris L.) belong to the most economically important tree species in Europe. The objectives were to determine the effect of the species composition of these two tree genera on the production, structure, diversity, and growth of mixed stands at lower elevations in the Czech Republic. Based on dendroecological samples, research was also carried out on the influence of climatic factors and climate change on the radial growth of these trees of interest. Mixed forests showed higher timber production by 29.8% compared to spruce and pine monocultures. The production of mature stands ranged from 328 to 479 m3·ha–1. Spruce achieved higher radial growth, but its growth variability was higher than that of pine. Compared to precipitation, temperatures had a greater influence on the radial growth of both tree species, especially in the growing season. In terms of diversity, mixed stands achieved significantly higher structural differentiation and overall diversity compared to monospecific variants. Mixed stands can achieve higher production potential, diversity, and especially resistance to climatic extremes in the lowland regions of the Czech Republic. The differences between mixed stands and monocultures, i.e. the effect of tree species mixing, depend on the appropriate proportions of tree species and their spatial pattern.

Antifungal effect of fresh and stored olive mill wastewater and its ethyl acetate extract against plant pathogenic fungiOriginal Paper

Raja Jarboui, Mona Saber Azab, Hallouma Bilel, Shaima M.N. Moustafa

Plant Protect. Sci., 2024, 60(1):65-79 | DOI: 10.17221/91/2023-PPS

Olive mill wastewater (OMW) has serious environmental implications due to its high organic matter content, particularly its phenolic compounds. Using OMW in crop protection has been suggested as an environmentally friendly alternative to reduce the impact of chemical pesticides on human health and the environment. This study aimed to investigate the antifungal activity of fresh and stored OMW, as well as its ethyl acetate extract, against several phytopathogenic fungi: Syncephalastrum racemosum, Paramyrothecium roridum, Fusarium oxysporum, and Verticillium dahliae. OMW was stored at 25 °C and 45 °C for three months, and both fresh and stored OMW were used in non-sterile, sterile, and centrifuged conditions. Phenolic and flavonoid compounds were extracted and identified by high-performance liquid chromatography (HPLC) analysis. Results showed that fresh OMW and its derivative compounds significantly inhibited the studied fungi. In contrast, OMW storage, sterilization, and centrifugation increased the mycelium growth of the fungi, particularly S. racemosum, which demonstrated relative resistance to stored OMW and its ethyl acetate extract. During storage, some phenolic and flavonoid compounds disappeared (resorcinol and vanillic acid), while the concentration of others increased (gallic acid, chlorogenic acid, and quercetin). This work highlights the potential use of fresh OMW as a bio-agent to protect plants from fungal diseases.

Dietary levels of soluble and insoluble fibre sources for young slow-growing broilersOriginal Paper

Nayanne Rodrigues de Oliveira, Fabiana Ramos dos Santos, Maura Regina Sousa Silva, Isadora da Silva Rissato, Geyniane Carvalho Roque, Carollynne Martins Silva, Hemylla Sousa Santos Barros, Nathan Ferreira da Si

Czech J. Anim. Sci., 2024, 69(4):139-154 | DOI: 10.17221/84/2023-CJAS

This study aimed to evaluate the effects of dietary levels of soluble and insoluble fibre on the performance and digestive development of slow-growing broilers during the starter period. A total of 400 one-day-old Isa LabelTM male chicks were used that were distributed in a completely randomized factorial design 2 × 2 + 1 (inclusion of 2% or 4% of corncobs as a source of insoluble fibre IF and citrus pulp as a source of soluble fibre (SF); and a control treatment) with eight replicates of 10 birds each. The addition of IF to diets improved the weight gain and feed conversion of broilers at 7 and 21 days of age. Both fibre sources added to diets resulted in higher relative weights of proventriculus + gizzard, liver, small and large intestine. The diets containing an SF source presented positive effects on the duodenal mucosa. In addition, positive effects on the caecal villus to crypt ratio were observed in broilers fed diets containing different types of fibre. It is concluded that dietary inclusion of IF up to 4% maintains the performance, nutrient metabolism and improves the development of the proventriculus + gizzard in slow-growing broilers. However, for improving the morphological and histomorphological parameters of slow-growing broilers in the starter phase the addition of SF sources is recommended.

Effects of medium-chain fatty acids on growth performance, microbial attributes, and fat deposition in broiler chickenReview

Hew Wei Ee, Suriya Kumari Ramiah, Saminathan Mookiah, Zulkifli Idrus

Czech J. Anim. Sci., 2024, 69(4):119-128 | DOI: 10.17221/175/2023-CJAS

Poultry are monogastric animals that share a fat tissue structure that is strikingly comparable to the fat in animal feed. This indicates that the kind and source of fat in animal diets can significantly impact the accumulation and composition of fatty tissue in the resulting carcass. Hence, feeding (or dietary) manipulation is one of the best and commonly employed management strategies to improve of gut health and function in broiler production. Medium-chain fatty acids (MCFAs) are fatty acids with six to twelve carbon atoms that are prevalent in coconut and palm kernel oils. Much research is being conducted on nutritional approaches to enhance gut health and lower the usage of antibiotics in poultry farming. The use of MCFAs as an antibiotic substitute has been shown to have significant positive effects on broilers’ health and performance due mainly to their short pathways of absorption and oxidation. However, the fatty acid makeup of these feed additions may vary, and the results are sometimes inconsistent. Although supplementing hen diets with MCFAs can lower intermuscular and abdominal fat, the precise mechanics are not entirely understood. The distinct metabolic roles of fatty acids in chickens are linked to both the degree of saturation and the length of the chain. Detailed information on the effect of MCFAs on the growth performance, antimicrobial properties, and fat deposition in broiler chickens are summarised.

Improving photosynthesis and the ascorbate-glutathione cycle of own-root and grafted-root chrysanthemums by brassinolide under drought stressOriginal Paper

Peng Ming Yang, Rui Jiao Yang, Song Tao He

Hort. Sci. (Prague), 2024, 51(1):59-67 | DOI: 10.17221/177/2022-HORTSCI

Many studies have demonstrated that brassinolide improves the drought tolerance of plants. This study aims to test whether the drought tolerance of chrysanthemums can be improved by brassinolide and to clarify the underlying physiological mechanism. An own-root chrysanthemum and a corresponding grafted-root line (Artemisia annua rootstock) were treated with brassinolide under three water levels in a randomised complete block design with five replications. The results showed that brassinolide increased the relative water content, net photosynthetic rate, chlorophyll (Chl) fluorescence parameters, Rubisco, ascorbate peroxidase, glutathione reductase, dehydroascorbate reductase and monodehydroascorbate reductase activities, ascorbate/dehydroascorbate, glutathione/oxidised glutathione and dry mass, and reduced the H2O2 content in the own-root and grafted-root chrysanthemums, especially under drought stresses. The magnitude of the changes to the parameters was greater in the own-root line than in the corresponding grafted-root line under brassinolide treatment. The above parameters showed significant differences (P < 0.05) between the brassinolide chrysanthemums and the corresponding non-brassinolide chrysanthemums under drought stresses. This might be the physiological mechanism of improved drought tolerance by brassinolide in chrysanthemums.

Influence of daily feed ration on growth and condition of juvenile pikeperch (Sander lucioperca) reared in a recirculating aquaculture system (RAS)Original Paper

Tomá¹ Pìnka, Oleksandr Malinovskyi, Jitka Koláøová, Václav Kuèera, Tomá¹ Policar

Czech J. Anim. Sci., 2024, 69(6):230-242 | DOI: 10.17221/33/2024-CJAS


The study tested the effect of daily feed ration (DFR: 0.5%, 0.75%, 1.0%, 1.25%, and 1.5% of fish biomass) on juvenile pikeperch (Sander lucioperca) with an initial body weight of 21.5 ± 5.1 g and total length of 144.5 ± 8.5 mm. The pikeperch were fed floating feed at 8-hour intervals for a duration of 84 days. By the end of the experiment, the group fed DFR of 1.5% exhibited the highest body weight (51.5 ± 16.1 g) and total length (188.2 ± 17.8 mm). The weight heterogeneity, measured as the coefficient of variation (CV), ranged between 30.29 and 33.24%. The specific heterogeneity rate (SHR) ranged from 304.44 to 334.94‰/day. The group with DFR of 1.0% exhibited the highest degree of heterogeneity. Minor fin erosion was observed in the caudal fin by the end of the experiment. No significant differences were revealed in selected biochemical parameters indicating the liver, spleen, and intestinal function. All the fish tested were adequately fed, being provided sufficient nutrients for the proper growth of pikeperch. The DFR of 1.5% was evaluated as the most favourable. This amount of feed supported a higher number of values for Fulton’s coefficient (FC), specific growth rate (SGR), thermal growth rate (TGR), fish weight heterogeneity, growth of total fish biomass (BG), and optimum level of biochemical parameters in blood plasma.

In vitro antifungal activity and mechanism of action of carvacrol against Sclerotinia sclerotiorum (Lib.) de Bary

Lei Yang, Xue Ma, Lijun Wang, Guogen Yang, Lijun Zhou, Zhilin Zhang, Xiaomeng Li

Plant Protect. Sci., 2024, 60(2):172-180 | DOI: 10.17221/121/2023-PPS

This study aimed to examine the antifungal effects of nine monoterpenes on Sclerotinia sclerotiorum via the mycelial growth rate method. The effects of carvacrol on the morphological structures of hyphae were investigated by scanning electron microscopy (SEM). The oxalic acid (OA), total protein contents, and the activity of cell wall-degrading enzymes, including chitinase, cellulase and β-1,3-glucanase, were assessed. The results showed that the antifungal rates of carvacrol, thymol and eugenol reached 100% at a concentration of 400 mg/L, and the EC50 values of carvacrol, thymol, and eugenol were 43.40, 56.22, and 86.63 mg/L, respectively. The treatment of S. sclerotiorum with carvacrol had no significant effect on sclerotia formation, but the mycelial surface was shrivelled, uneven and broken, with cytoplasm flowing out. The OA content of S. sclerotiorum was significantly reduced to 133.78 µg/mL after treatment with carvacrol. Additionally, the total protein content of S. sclerotiorum mycelia in the carvacrol treatment group was significantly reduced to 15.67 µg/mL compared with that of the control group, and the activity of cellulase in the carvacrol treatment group was significantly higher than that in the control group.

Overgrazing strongly impedes the natural regeneration of the endemic Boswellia species on Socotra IslandOriginal Paper

Salem Hamdiah, Klemen Eler, Kay Van Damme, Fabio Attorre, Dario La Montagna, Michele De Sanctis, Mohammed Shaneyehen, Mohammed Amar, Theodore Danso Marfo, Petr Madìra

J. For. Sci., 2024, 70(5):249-263 | DOI: 10.17221/3/2024-JFS

Frankincense trees (Boswellia spp.) worldwide are affected by a number of threats, including global warming and changing land management practices. On the Socotra Archipelago (Yemen), which harbours eleven endemic Boswellia species, grazing is generally assumed to be one of the main threats preventing natural regeneration. To test the impact of overgrazing on natural regeneration, we established an in situ experiment on four different Boswellia taxa in different areas of Socotra Island. Mortality and the height increment of seedlings were measured for a period of two/three years in five plots excluded from grazing (fenced) and in five paired control (unfenced) plots. Each plot was 50 m × 50 m in size and contained several adult trees as a source of viable seeds. Our results show that seedling mortality was significantly higher, and seedling height increment generally (4 out of 5 sites) lower in open compared to fenced plots. In the fenced plots, the number of seedlings for all species reached up to 772, with 560 surviving seedlings. In comparison, the control plots reached up to 296 seedlings, with 176 seedlings surviving after 2–3 years. The results of our experimental study indicate that grazing directly threatens the natural regeneration of the endemic Boswellia on Socotra Island. However, seedling mortality remained relatively high inside the exclosures as well, which indicates that even without the pressure of livestock grazing, other impacts remain a challenge for the future conservation of the archipelago's unique frankincense trees.

Molecular, morphological and phytochemical characterization of some watermelon (Citrullus lanatus L.) genotypesOriginal Paper

Ömer Faruk Coºkun, Osman Gülºen

Hort. Sci. (Prague), 2024, 51(3):189-201 | DOI: 10.17221/5/2023-HORTSCI

Watermelon (Citrullus lanatus L.) is grown in tropical and temperate regions and an economically important crop. Characterization studies of watermelon may provide valuable information for breeding and research programs. The objectives of this study were to determined of morphological, phytochemical, genetic diversity and population structure among the watermelons. Morphological and phytochemical variations including sugar contents were determined in 96 watermelon genotypes grown in the field. The average number of fruits per plant was determined as 2.52 ± 0.06, and the average yield was determined as 6.2 ± 0.11 kg/m2. The mean total sugar was determined as 6.27 ± 0.12 %, and the lowest value was measured in genotype 234 (1.1%); the highest value was measured in genotype number 184 (8.66%). A total of 62 SSR (Simple Sequence Repeat) primers were used in the molecular characterization study. The similarity coefficients among the 96 genotypes varied between 0.23 and 0.99. This study indicates that there is a wide morphological and sugar parameters variation among watermelon genotypes but narrow molecular genetic diversity. It also provides useful information for watermelon breeding studies.

Phytochemical, antioxidant activity, and thermal stability of Clitoria ternatea flower extractsOriginal Paper

Sy-Yu Shiau, Yuhan Wang, Yanli Yu, Songling Cai, Qian Liu

Czech J. Food Sci., 2024, 42(4):284-294 | DOI: 10.17221/68/2024-CJFS


The demand for beneficial, safe natural pigments is growing. Clitoria ternatea (CT) flowers are a promising source of natural blue colours and bioactive compounds. This study extracted intact CT flowers (CTFs) and their powders (CTFPs) with distilled water at various temperatures (30–90 °C) and durations (30–180 min). The total anthocyanin content (TAC) and total phenolic content (TPC) of the CT extracts were analysed by using the pH differential and Folin-Ciocalteu methods, respectively. The antioxidant activity was expressed as the ability to scavenge DPPH (2,2-diphenyl-1-picrylhydrazyl) radicals. The results showed that different sample types significantly (P < 0.05) influenced the TAC, TPC, and antioxidant activity. The optimal TAC and TPC extraction for CTF was at 90 °C for 90 min, and for CTFP at 90 °C for 30 min. Using hot water instead of 60% alcohol organic solvent was feasible for extracting the phytochemicals, particularly with CTF. Ultrasound-assisted extraction was notably effective for anthocyanins from intact flowers. Higher heating temperatures and pH values increased the anthocyanin degradation rate constants, while a higher pH decreased the activation energy. Thus, blue aqueous CT flower extracts, rich in phytochemicals and antioxidants, have the potential for use in foods and nutraceuticals with neutral and acidic pH values.

Anti-diabetic effect of rice extract constituents through the molecular inhibition of α-amylase and α-glucosidase activityOriginal Paper

Subhashini Ramakrishnan, Thomas Jebastin, Sumathy Raj, Ariyamuthu Ramathilaga, Rithik Selvaraj, Najat A. Bukhari A., Ashraf Atef Hatamleh, Anis Ahamed

Plant Soil Environ., 2024, 70(11):683-694 | DOI: 10.17221/150/2024-PSE

Carbohydrate digestive enzymes like α-amylase and α-glucosidase can be used to treat and manage diabetes. By inhibiting these enzymes, carbohydrate digestion slowed down, lowering the level of glucose entry into the bloodstream and preventing postprandial hyperglycemia. However, the effectiveness of current antidiabetic agents is limited due to their adverse effects. Therefore, the current study explored natural inhibitors from the methanol extract of rice to combat this issue. Through an integrated approach, four different rice cultivars were analysed and found that red rice methanol extract compounds stigmasterol and 1,2-benzenedicarboxylic acid interacted with α-amylase and α-glucosidase. Additionally, further research on stigmasterol directs the structure-activity relationship studies that aid in managing diabetic conditions.

Agribusiness resilience during the COVID-19 pandemic: The role of credit constraintsOriginal Paper

Ekin Ayse Özsuca

Agric. Econ. - Czech, 2024, 70(12):591-605 | DOI: 10.17221/56/2024-AGRICECON

This paper investigates the effect of pre-COVID credit constraints and the moderating role of government support on agribusiness resilience following the outbreak of COVID-19. Using a dataset covering 42 countries, we provide empirical evidence on how firm characteristics and credit constraints affect agribusinesses’ likelihood of survival and performance during the pandemic. On the enterprise level, size, foreign ownership and gender of the manager are found to display a statistically significant relationship with closure and sales performance. The findings reveal that pre-existing credit constraints tended to magnify the negative impacts of the pandemic. Specifically, agribusinesses with better access to finance were less likely to experience a decline in sales and exit from the market and, hence, were in a better position to withstand pandemic-induced shock. The results further highlighted the positive role of government support on agribusiness resilience, whereas obtaining government aid was found to have no significant effect on moderating the link between financial conditions and resilience. Finally, the results showed that financially constrained agribusinesses are more likely to suffer from liquidity/cash flow problems and experience overdue financial obligations during the pandemic. In coping with their liquidity shortfalls, these agribusinesses were less likely to access formal credit and more likely to delay payments to suppliers/workers.

Evaluation of Streptococcus species isolated from subclinical sheep mastitis by molecular methods and determination of virulence factors and antimicrobial resistance genesOriginal Paper

V Ozavci, HT Yuksel Dolgun, S Kirkan, Y Seferoglu, Z Semen, U Parin

Vet Med - Czech, 2023, 68(9):359-367 | DOI: 10.17221/42/2023-VETMED

Streptococcus (S.) species are important pathogens that cause mastitis in sheep. The study aimed to examine Streptococcus species in sheep milk with subclinical mastitis, assessing their prevalence, antimicrobial resistance, and virulence genes. A total of 200 milk samples were collected from sheep farms in İzmir’s five districts. Out of 32 (28.6%) Streptococcus isolates identified by phenotypic methods, 25 were genotypically identified as S. uberis, 5 as S. agalactiae, and 2 as S. dysgalactiae. Disk diffusion was used to determine the antimicrobial resistance of the isolates. PCR was employed to identify antimicrobial resistance and virulence genes in the isolates. The highest resistance was found for cloxacillin (100%), and the highest sensitivity was found for florfenicol (84%). The most common resistance gene combination was tetM+tetS (3/32) for S. uberis in 9.4%. A total of five virulence genes were detected. GapC+sua (56.2%) constituted the most common gene pattern. The highest virulence gene gapC was detected in 78.1% (25/32) of the isolates. The cylE gene was not detected (0%) in the isolates. Streptococcus species may play a role in mastitis in sheep, emphasising the need for meticulous hygienic milking practices.


Dietary biochar as a feed additive for increasing livestock performance: A meta-analysis of in vitro and in vivo experimentOriginal Paper

Novia Qomariyah, Andi Ella, Salfina Nurdin Ahmad, Yenni Yusriani, Mohammad Miftakhus Sholikin, Tri Rachmanto Prihambodo, Yuli Retnani, Anuraga Jayanegara, Elizabeth Wina, Idat G. Permana

Czech J. Anim. Sci., 2023, 68(2):72-86 | DOI: 10.17221/124/2022-CJAS


The present study aimed to evaluate the use of biochar as a feed additive on nutrient utilization and livestock performance by employing a meta-analysis method. Various in vitro and in vivo studies regarding the effects of biochar on rumen fermentation, nutrient disappearance, total gas, methane production, microbial population, feed intake, growth performance, blood constituents, nutrient digestibility and nitrogen retention were tabulated in a database. Data were analysed using the mixed model method in which the different studies were considered as random effects while the biochar addition was treated as a fixed effect. The addition of biochar reduced methane production (quadratic pattern; < 0.05), but increased the total gas production (< 0.001). Addition of biochar decreased (quadratic pattern; < 0.05) volatile fatty acids and acetic acid in the in vitro rumen fermentation data. In the in vivo data, a reduction in feed conversion ratio (quadratic pattern; < 0.05), as well as a reduction (< 0.05) in the feed intake parameters of dry matter, organic matter, crude protein, and neutral detergent fibre were observed with biochar addition. Ammonia production and propionic acid tended to increase linearly (< 0.05) with the biochar supplementation. The biochar supplementation increased (< 0.05) the nutrient digestibility (dry matter, organic matter, crude protein, neutral detergent fibre) and nitrogen retention. In conclusion, biochar supplementation of ruminant diet modulates rumen fermentation by increasing propionic acid but decreasing methane emissions, and enhances livestock performance by increasing nutrient digestibility, growth performance as well as nitrogen retention.

Effects of selenomethionine on the growth and physiological characteristics of Scrophularia ningpoensis seedlingsOriginal Paper

Xiaoqing Zhang, Yi Luo, Changjuan Shan

Plant Soil Environ., 2024, 70(3):176-187 | DOI: 10.17221/381/2023-PSE

In order to provide a theoretical basis for the application of organic selenium (Se) in the production and cultivation of Scrophularia ningpoensis Hemsl. We investigated the effects of selenomethionine (SeMet) on the growth and physiological characteristics of S. ningpoensis seedlings. The results showed that SeMet significantly improved the antioxidant capacity by enhancing the activities of antioxidant enzymes such as superoxide dismutase (SOD), peroxidase (POD), catalase (CAT) and ascorbate peroxidase (APX) in the leaves of S. ningpoensis, which significantly reduced the content of malondialdehyde (MDA) and hydrogen peroxide (H2O2), as compared to the control. SeMet also significantly improved the water metabolism by increasing the transpiration rate, stomatal conductance, water use efficiency (WUE), relative water content, and water saturation deficit of S. ningpoensis leaves. Moreover, SeMet significantly enhanced photosynthetic performance by decreasing non-photochemical quenching (NPQ) and increasing the soil and plant analyser development (SPAD) value, net photosynthetic rate, PSII actual photochemical efficiency Y(II), photochemical quenching (qP), PSII photochemical effective quantum yield (Fv'/Fm') and apparent electron transport rate (ETR). Meanwhile, SeMet significantly improved the plant’s height, basal diameter, root/shoot ratio and dry weight of shoots and roots in S. ningpoensis. Various SeMet 30 and 60 mg/L SeMet concentrations demonstrated better effects on the growth and physiological characteristics of S. ningpoensis. The above results indicate that appropriate concentrations of SeMet can enhance the growth of S. ningpoensis and can be improved by increasing its antioxidant capacity, water metabolism, and photosynthetic performance. This provides a theoretical foundation for using organic selenium in growing and producing S. ningpoensis.

Characteristics of powdery mildew [Sawadaea bicornis (Wallr.) Miyabe] influence on the photosynthetic process in Norway maple (Acer platanoides L.) seedlingsShort Communication

Anna Alexeyeva, Kyrylo Holoborodko, Iryna Ivanko, Olexandr Zhukov, Iryna Loza

J. For. Sci., 2024, 70(1):31-39 | DOI: 10.17221/30/2023-JFS

The article presents the results of research on the impact of Sawadaea bicornis (Wallr.) Miyabe on the state of photosynthetic apparatus in Acer platanoides L. seedlings using a technique of chlorophyll fluorescence induction (ChlF) measurement, which at the present time can be implemented through the use of biosensors. The research was conducted in September 2022 in the territory of the Botanical Garden of Oles Honchar Dnipro National University. To diagnose a violation of the native chlorophyll photosynthesis in fresh leaves of A. platanoides, a portable fluorometer 'Floratest' was used (the selected spectral range for fluorescence intensity measurement was 670–800 nm). The research was carried out on fresh leaves of Norway maple seedlings both not unaffected and affected with powdery mildew. Analysis of the data obtained indicates a high sensitivity of the parameters of chlorophyll fluorescence induction to damage by the disease regardless of environmental conditions of local growth of A. platanoides seedlings. The high informativeness of induction changes in chlorophyll fluorescence in the structural organisation of chloroplasts in Norway maple leaves determined by the parameters Fo, Fm, Fv, Fv/, Fv/Fm, (FmFst)/Fst, (Fp)/Fv was revealed. This study demonstrated the effectiveness of using the studied chlorophyll fluorescence parameters to detect severe stress in Norway maple seedlings caused by powdery mildew exposure when the fungus affects more than 50% of the leaf blade area. It is further necessary to conduct dynamic studies throughout the growing season to determine the effectiveness of using these parameters to detect mild stress in the early stages of infection.

The nurse sow system ‒ A natural process of handling large litters: A reviewReview

Joab Malanda Osotsi, Gabriella Novotni-Danko, Peter Balogh

Czech J. Anim. Sci., 2024, 69(3):89-101 | DOI: 10.17221/158/2023-CJAS

Reproductive performance in pig production has gained genetic momentum resulting in large litters. Several strategies have been used to raise the number of piglets to address the challenge of a large litter size. This review provides a rationale for employing the nurse sow system as a biological way of handling large litters, exploring its step-by-step processes and its selected impacts. By exposing these steps, pig farmers will use the information to pinpoint their weak points in the chain and customize the procedures to meet their farm-specific goals for improved productivity. The nurse sow system helps to maximize pre-weaning survival by boosting the overall worth of low birth weight piglets. When piglets weaned per sow/year are used as a performance benchmark, nurse sows weaning double litters become economically advantageous. Extended time in lactation for nurse sows gives them an ample time for their uterus to involute before the next pregnancy. However, nurse sows lose their body reserves reflected in backfat thickness from high milk production. Prolonged confinement in lactation deteriorates the physical condition of nurse sows, resulting in leg ulcers and teat damage. Additionally, piglets are more distressed when taken away from their biological sow to a new sow.

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