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Results 1411 to 1440 of 4551:

Intraspecific structural signs of curly silver fir (Abies alba Mill.) growing in the Ukrainian CarpathiansOriginal Paper

Ivan Sopushynskyy, Ruslan Maksymchuk, Yaroslav Kopolovets, Sezgin Ayan

J. For. Sci., 2020, 66(7):299-308 | DOI: 10.17221/79/2020-JFS

The aim of this paper is to present the intraspecific differentiation of the curly silver fir (Abies alba Mill.) by the wood structure growing in the Ukrainian Carpathians. To find the morphological distinctions by using the silvicultural and biometric methods, 50 silver fir trees with anomalous wavy-relief stemwood formations were investigated. The trees aged from 94 to 132 years were characterised by the diameter at breast height of 32-59 cm. The length of the wave-grained stemwood varied from 6 to 11.5 m. The amplitude of the wood fibre waves varied from 4.4 to 24.1 mm. The smallest values of the amplitude of the wave-grained wood corresponded to the smaller wavelengths. The significant differences in the wood density and annual growth between the silver fir trees with the straight-grained and wave-grained stem wood were determined. The number of annual rings in 1 cm of the curly silver fir was 27.1% lower and 22.7% higher than the same characteristics for the straight-grained stem wood. The obtained linear equation described the relationship between the number of annual rings in 1 cm and the basic wood density of the silver fir with the straight-grained wood. The aesthetic features of the curly silver fir stem wood were discussed in the subject area of a new niche of exclusive wood products.

The effect of a sudden temperature decrease on selected physiological indices in the common carpOriginal Paper

N Hodkovicova, J Mares, P Sehonova, J Blahova, M Faldyna, H Modra, F Tichy, J Caha, A Vrankova, Z Svobodova

Vet Med - Czech, 2020, 65(8):346-357 | DOI: 10.17221/67/2020-VETMED

The objective of the study was to evaluate stress invoked by a temperature decrease in the common carp (n = 56). After acclimatisation to laboratory conditions at a temperature of 27.8 ± 1.0 °C, the fish (n = 28) were transferred to 16.8 ± 1.0 °C water (group T2; temperature difference Δ -11 °C); the rest of the fish were kept at the original water temperature (group T1). The examination of individual fish was made after 6, 12, 24 and 48 hours (h). The impact on the haematological and biochemical indices was evaluated. Furthermore, the effect on the food content passage speed was investigated and a histopathological examination was performed. The changed haematological indices in the T2 group returned to the T1 values 48 h after a temperature decrease, except for the neutrophil-lymphocyte ratio which was found to be higher in all the T2 samplings. Most of the monitored biochemical indices decreased in the T2 group and some of them remained that way at 48 hours. On the contrary, the liver enzymes increased in the T2 group at 48 hours. The passage of food through the digestive tract was mostly finished after 48 h for both groups. However, in the warmer water, the intestine was empty in 71.4% cases after 24 h already, while in the T2 group, the food content passage was only completed in 14.3% of the fish at the same time. Local gill and skin necrosis, and mononuclear cell infiltration were found in the T2 group. A sudden change in the temperature can affect various parameters of the common carp, however, these changes can mostly be eliminated within 48 hours.

In vitro pharmacokinetics/pharmacodynamics evaluation of marbofloxacin against Staphylococcus pseudintermediusOriginal Paper

Y Quah, N Boby, SC Park

Vet Med - Czech, 2020, 65(3):116-122 | DOI: 10.17221/82/2019-VETMED

This study aimed at determining the in vitro antibacterial activity of a clinically achievable marbofloxacin (MAR) concentration against the clinical isolate S. pseudintermedius in an in vitro dynamic model simulating the in vivo pharmacokinetics of dogs. The in vitro PK/PD (pharmacokinetic/pharmacodynamic) model that mimics the single daily doses of MAR (half-life, 8 h) was simulated. An inoculum (108 cfu/ml) of clinical isolate S. pseudintermedius (MIC = 0.0625 μg/ml) was exposed to monoexponentially decreasing concentrations of MAR with simulated AUC24 h/MIC varied from 34.81 h to 696.15 h. Every two hours, the multiple sample colony forming units were determined. The result of this study demonstrated that the clinically achieved MAR concentrations at AUC24 h/MIC ratios of 348.08 and 696.15 h produced a pronounced reduction in the bacterial counts and prevented the re-growth of the clinical isolate S. pseudintermedius. However, further study, considering the strains with different susceptibility levels, is recommended.

Regional heterogeneity among non-operating earnings quality, stock returns, and firm value in biotech industryOriginal Paper

Joe-Ming Lee

Agric. Econ. - Czech, 2019, 65(1):10-20 | DOI: 10.17221/24/2018-AGRICECON

This paper analyses regional heterogeneity under the discretionary measures of non-operating earnings quality and stock returns on firm value in Taiwan's biotech industry during 2008-2015. An econometric framework based on panel smooth transition regression models is employed in a non-linear panel data model. The results show that biotech firms near the bottom threshold for operating income have low-quality non-operating earnings and those near the upper threshold demonstrate the opposite. Investors who exclusively focus on stock returns are thus likely to miss important information about the quality of earnings.

The effect of agronomic measures on grain yield of winter wheat in drier conditionsOriginal Paper

Petr Vrtílek, Vladimír Smutný, Tamara Dryąlová, Lubomír Neudert, Jan Křen

Plant Soil Environ., 2019, 65(2):63-70 | DOI: 10.17221/472/2018-PSE

The objective of this study was to evaluate the effect of a year of cultivation and three agronomic measures (pre-crop, soil tillage, application of fungicides) on the yield of winter wheat grown in the crop rotation without the livestock production. The results from the years 2011-2017, except for the year 2012, from the ®abčice Field Experimental Station (49°01'20''N, 16°37'55''E) were evaluated. The soil texture is clay loam soil and the soil type is fluvisol. In the field trial, winter wheat was grown after two pre-crops (winter wheat, pea). Two soil tillage technologies, namely the conventional tillage - CT (ploughing - at a depth of 24 cm) and the minimum tillage - MT (shallow loosening - at a depth of 15 cm) were used. Two fungicide treatments against leaf and spikelet diseases were used, and they were compared to the non-treated variants. The obtained results showed that the grain yield of winter wheat was statistically influenced not only by a year of cultivation, but also by the pre-crop, the application of fungicides, and mostly by the interaction of these factors with the soil tillage. The importance of pea as a suitable pre-crop for winter wheat was confirmed as the grain yield was higher compared to winter wheat as a pre-crop by an average of 0.49 t/ha. It was also found that the MT is a more appropriate technology than the CT, on average by 0.12 t/ha over the six years. The importance of fungicide treatment was also confirmed, where the grain yield of winter wheat was higher by 0.26 t/ha compared to the non-treated variant. The presented results brought a new knowledge for winter wheat management practice in dry conditions.

Boron content in soils under increasing magnesium and sulphur doses in a field experimentOriginal Paper

Gabriela Mühlbachová, Pavel Čermák, Martin Káą, Radek Vavera, Miroslava Pechová, Kateřina Marková

Plant Soil Environ., 2020, 66(7):366-373 | DOI: 10.17221/221/2020-PSE

The three-year field experiment (2015-2017) with graded doses of magnesium (Mg) and sulphur (S) was carried out at the Humpolec experimental station (49.5546239N, 15.3485489E; Czech Republic). The interactions between boron (B), Mg and S in the soil were studied. No boron was applied into soils. Contents of B, S and Mg in the soil were determined by the Mehlich 3 and NH4 acetate methods. The crop rotation was: spring barley-oilseed rape-winter wheat. Three Kieserite doses (S and Mg fertiliser) were applied. Sulphur treatments were 10-20-40 kg S/ha to cereals and 20-40-80 kg S/ha to oilseed rape. The doses of Mg were: 13-26-52 kg Mg/ha to cereals and 26-52-104 kg Mg/ha to oilseed rape. A significant gradual decrease of B-Mehlich 3 was observed under Kieserite treatments during the experiment (from 1.24 mg B/kg in control in the 1st year to 0.92 mg B/kg in the 3rd year). On the contrary, B-NH4 acetate contents in soils remained similar during 2015-2017 in control soils (0.33-0.39 mg B/kg) and significantly decreased under Kieserite treatments, namely by 55-57% in 2016 and by 43-48% in 2017. A significant decrease of B content in soils was noted since the second year of experiment after oilseed rape. The boron contents in soils were affected in several ways - by adsorption of B on magnesium oxides and other substances, exchange with SO42- anions and possible leaching, and also by the uptake by grown crops, mainly oilseed rape.

Study on the associative effects of different proportions of soybean pod, alfalfa and concentrate on the diets at different ratio of concentrate to roughage in vitroOriginal Paper

Jiu Yuan, Xinjie Wan, Guoshun Chen

Czech J. Anim. Sci., 2020, 65(10):389-401 | DOI: 10.17221/165/2020-CJAS

This study aimed to determine the associative effects (AEs) of 28 feed combinations of concentrate/soybean pod/alfalfa at different concentrate-roughage ratios that were incubated for 72 h in single tubes (120 ml) which were added 30 ml rumen buffered fluid. The gas production (GP) at 0, 2, 4, 6, 9, 12, 24, 36, 48, 72 h was recorded. A single exponential equation was applied to calculate the GP parameters a (rapid GP), b (slow GP), a + b (GP potential) and c (rate constant of slow GP that can reflect the specific process of GP, rapid and slow GP and GP rate). The AEs were calculated by 72 h GP and weighted estimation value of each combination. After 72 h incubation, pH, volatile fatty acids (VFA) and ammonia nitrogen (NH3-N), dry matter digestibility (DMD), organic matter digestibility (OMD) were determined the incubation fluid and residues. The single-factor AE index (SFAEI) and multiple-factor AE index (MFAEI) were computed. The results showed that the groups 50 : 50 : 0, 40 : 60 : 0, 60 : 20 : 20, 60 : 10 : 30, 50 : 30 : 20, 50 : 20 : 30, 40 : 50 : 10, 30 : 55 : 15, 30 : 40 : 30, 20 : 65 : 15, 20 : 50 : 30 had higher GP72 h, a, b, DMD, OMD, NH3-N, in addition, higher AE of GP, DMD, OMD, total VFA and NH3-N than those of the other groups (P < 0.05 or P < 0.01), especially the group 30 : 55 : 15 was optimal. In conclusion, in vitro data reveal reliable fermentability and the highest SFAEI and MFAEI occurred when concentrate, soybean pod and alfalfa were combined at the ratios of 50 : 50 : 0, 40 : 60 : 0, 60 : 20 : 20, 60 : 10 : 30, 50 : 30 : 20, 50 : 20 : 30, 40 : 50 : 10, 30 : 55 : 15, 30 : 40 : 30, 20 : 65 : 15, 20 : 50 : 30.

Lungworm infections in dogs from Central EuropeOriginal Paper

V. Cabanova, Z. Hurnikova, M. Miterpakova, K. Dirbakova, A. Bendova, P. Kocak

Vet Med - Czech, 2018, 63(8):367-372 | DOI: 10.17221/24/2018-VETMED

Angiostrongylus vasorum and Crenosoma vulpis are parasites in the respiratory tract of domestic and wild carnivores. Recently, an increasing number of lungworm infections in dogs has been recognized in Europe. In this report, the results of the first copro-epidemiological study of A. vasorum and C. vulpis in dogs from Slovakia are presented. The Baermann technique and the modified flotation method with zinc sulphate solution (specific gravity 1.2) was used for lungworm detection. In addition, conventional PCR was performed for species confirmation. The majority of lungworm infections were found in the eastern part of the country. A relatively high prevalence (4.13%) of A. vasorum was detected in different parts of Slovakia. Infection was detected most frequently incidentally in asymptomatic dogs. Within this study, crenosomosis was detected for the first time in dogs from Slovakia. Since one infected dog had no travel history, the case is considered autochthonous. An autochthonous case report of angiostrongylosis in a Hanoverian hound puppy from central Slovakia is also described.

Suckling piglet coccidiosis on farms in the Czech Republic - A pilot studyOriginal Paper

D Sperling, H Karembe, J Vanhara, B Hinney, A Joachim

Vet Med - Czech, 2020, 65(10):427-434 | DOI: 10.17221/62/2020-VETMED

Suckling piglet coccidiosis is a common diarrhoeal disease of unweaned pigs caused by Cystoisospora suis with previously reported herd prevalences of 60% and more. The parasite quickly spreads in affected herds and causes malabsorption and a reduced and uneven body weight gain. The only drug currently licenced for the control of porcine cystoisosporiasis is toltrazuril, which suppresses parasite development and the corresponding diarrhoea. A recent study detected high prevalences of C. suis on swine farms in Austria, Germany, Spain and the Czech Republic independent of the treatment. Here, the situation in the Czech Republic is evaluated in more detail. In total, faecal samples from 161 litters (two samples/litter in the second and third week of life) from 17 farms (250-2 000 sows) were examined for the presence of C. suis oocysts by autofluorescence and for faecal consistency. An accompanying questionnaire revealed details on the herd management and treatments. Eight farms applied toltrazuril on the 3rd, 4th or 5th day of life. Overall, 70.6% of the farms and 32.2% of the litters were positive for C. suis at least once, 39.4% in the untreated litters (n = 76) and 24.8% in the treated litters (n = 85). Diarrhoea occurred on eight farms (six with the toltrazuril treatment) in 11.9% of the untreated and 2.5% of the treated litters. This study shows that coccidiosis is still common in Czech swine farms and that treatment in the recommended time frame may reduce the diarrhoea, but cannot interrupt the parasite's life cycle. Some type of effective disinfection, which may have contributed to a more effective parasite control, was not in place in any of the farms.

Efficiency of a modified plastic tank as a bio-degradation system in Sub-Saharan African countriesOriginal Paper

Chibuzo Stanley Nwankwo, Chigozie Francis Okoyeuzu, Ikpeama Ahamefula

Res. Agr. Eng., 2020, 66(3):89-96 | DOI: 10.17221/21/2020-RAE

The efficiency of three modified plastic digesters (3.6 m3 each) using food waste for biogas generation in cooking food was evaluated. The experiment was laid out based on a completely randomised design. A plastic tank was modified as a biodegradation system for food waste digestion to generate a biogas. The biochemical and chemical oxygen demand ranged from 44.58 to 49.62% and 130.42 to 139.20%, respectively, before digestion, but decreased significantly (P < 0.05) after digestion. The pH of the fermenting slurry fluctuated (6.24-6.86) and an average biogas of 0.574 m3 (505-601 L.day-1) per day was generated from the three experimental waste proportions which would be sufficient to cook three meals per day for 3 to 4 people. The methane gas significantly increased (P < 0.05) while the carbon-dioxide significantly decreased (P < 0.05) at the peak of the biogas production. The generated biogas significantly cooked (P < 0.05) faster than kerosene, but not faster than liquefied petroleum gas. The flammable biogas generation and high significant (P <0.05) percentage change in the physico-chemical properties of the wastes after digestion implied high efficiency performance of the digesters modified from the plastic tanks.

The physical and mechanical properties of potato (Solanum tuberosum L.) tubers as related to the automatic separation from clods and stonesOriginal Paper

Ghasem Abedi, Shamsollah Abdollahpour, Mohammad Reza Bakhtiari

Res. Agr. Eng., 2019, 65(3):77-84 | DOI: 10.17221/24/2018-RAE

In the current research, some of the mechanical and physical properties of two industrial varieties of potato tubers that have a prominent role in the mechanised separation process from clods and stones were investigated. These properties include the physical dimension, mass, volume, sphericity, surface area, density, projected areas and Young's modulus. In addition, the static coefficient of friction and rolling resistance for tubers on five surface materials were determined. The tuber's size positively affected the physical and mechanical properties of the tubers. The frictional properties of the tubers were affected by the tuber size, the surface type, and the interaction between them. The results showed that most of the apparent properties for the Sante variety were greater than those of the Marfona variety. The static coefficient of friction for the tubers on a wood surface was the maximum and was the minimum value on a galvanized sheet, but for the tuber's rolling resistance, the results were inversed. The results proposed that the automatic separation of the potato tubers from the impurities using the properties of the crop is possible.

The structure of subpopulations of stallion spermatozoa after thawing differs between good and poor freezersOriginal Paper

Filipa Bubeníčková, Jiří ©ichtař, Linda Nováčková, Jitka Sirohi, Ondřej ©imoník

Czech J. Anim. Sci., 2020, 65(11):403-410 | DOI: 10.17221/127/2020-CJAS

The aim of this study was to evaluate differences in the presence of sperm subpopulations in frozen-thawed semen in stallions with different freezability. The motility of individual spermatozoa of 24 stallions from 15 breeds was evaluated using computer-assisted sperm analysis (CASA) immediately after thawing (T0) and after 30 min of incubation (T30). In accordance with our previous studies, samples were initially divided based on their total motility into categories of good (GF) and poor (PF) freezers. K-means cluster analysis of kinematic parameters of spermatozoa was used to divide motile sperm (n = 57 630) into three subpopulations. Analysis of variance was used to evaluate differences in the subpopulations between GF and PF stallions at the times of incubation T0 and T30. Statistically significant differences were found in most kinematic parameters between PF and GF stallions as well as between the times of incubation T0 and T30 (P < 0.05). Spermatozoa of good freezers are represented more frequently in the fast and medium fast subpopulations and are faster and more linear than those of poor freezers (P < 0.05). Sperm from PF stallions were more strongly affected by longer incubation. The percentage of sperm in the fast and medium fast subpopulations was lower in samples from PF stallions, but assessment of the motility parameters in particular sperm subpopulations revealed that these sperm had good velocity. Poor freezer samples had lower sperm quality due to a reduced total proportion of motile sperm, and these samples were more sensitive to prolonged time after thawing. Thus, an efficient sperm selection method or a special insemination technique should be used for obtaining doses from stallions with poor freezability. Our study showed that the CASA system and cluster analysis are promising tools for better understanding the significant differences in the individual stallion freezability, and further research should be focused on their application in the field.

Palm date (Phoenix dactylifera) seeds: A rich source of antioxidant and antibacterial activitiesOriginal Paper

Abuelgassim Omer Abuelgassim, Mohamed Abdellatif Eltayeb, Farid Shokry Ataya

Czech J. Food Sci., 2020, 38(3):171-178 | DOI: 10.17221/269/2019-CJFS

Two varieties of palm date seeds (PDS), Sukkari and Khalas, were examined for their antioxidant and antibacterial activities. Total phenol content was 2 014.37 ± 212.05 and 2 060.40 ± 176.0 mg GAE 100 g-1 dry weight (DW); and total flavonoid content was 83.98 ± 1.10 and 94.97 ± 1.36 mg QE 100 g-1 DW for Sukkari and Khalas, respectively. PDS extracts showed potential scavenging activity against ABTS, DDPH, and hydroxyl radical; the calculated IC50s were 431.17 ± 12.45, 400 ± 10.87 and 680 ± 18.12 µg for Sukkari, and 476 ± 20.25, 302.24 ± 14.08 and 284.18 ± 11.62 µg for Khalas, respectively. PDS extracts did not show potential activity against superoxide anion. Both extracts showed a high percentage of reducing power as the calculated FRAP (ferric reducing antioxidant power) concentrations were 12.66 ± 1.08 and 16.14 ± 1.94 mmol ascorbic acid equivalent 100 g-1 for Sukkari and Khalas, respectively. Bacillus subtilis showed a remarkable sensitivity to PDS extracts; the inhibition zones were 21 ± 0.82 and 22 ± 0.67 mm for Sukkari and Khalas, respectively. PDS extracts possess good antioxidant and antibacterial activity, and therefore PDS could be effectively used as a natural source of antioxidants and to be detected against gram-positive bacteria.

Effects of fermented Caragana korshinskii on the intramuscular fat content and expression of FABP3, UBE3C, ADRB3, LIPE, and SCD in different muscles of Tan sheepOriginal Paper

Xiaochun Xu, Tingda Liu, Shanshan Fan, Wenping Ma, Wenjuan Chen, Xiu Zhang

Czech J. Anim. Sci., 2020, 65(4):145-152 | DOI: 10.17221/231/2019-CJAS

The aim of this study was to investigate the effects of fermented Caragana korshinskii on the intramuscular fat content and varied expression of the intramuscular fat deposition-related genes FABP3, UBE3C, ADRB3, LIPE, and SCD among four muscle tissues (m. psoas, gluteus, quadriceps, and supraspinatus) of Tan sheep. Twenty-eight male animals of similar age (270 ± 10 days) and weight (24.6 ± 1.06 kg) were randomly divided into a control group (fed the basal diet) and an experimental group (fed the same diet except 10% of corn stalks were replaced with fermented C. korshinskii). Soxhlet petroleum-ether extraction and quantitative real-time PCR were applied to evaluate the fat content and gene expression in tissues, respectively. We observed a significant improvement (P < 0.05) in the intramuscular fat contents in the m. gluteus and supraspinatus of treated sheep compared to those of non treated sheep. The FABP3 mRNA level was markedly higher (P < 0.05) in the m. quadriceps and supraspinatus of treated sheep than in the control sheep. UBE3C mRNA levels were significantly decreased in the m. gluteus, quadriceps, and supraspinatus (P < 0.05) of treated sheep compared with those of the control sheep. ADRB3 mRNA levels were significantly lower (P < 0.05) in the m. psoas, gluteus, and supraspinatus of sheep fed fermented C. korshinskii than in the control group, whereas LIPE mRNA levels were significantly increased (P < 0.05) in the m. gluteus and quadriceps of sheep fed fermented C. korshinskii. The SCD mRNA levels in m. psoas, quadriceps, and supraspinatus of sheep fed fermented C. korshinskii were significantly higher than those of the control group (P < 0.05). Our results indicated that fermented C. korshinskii could partially replace the roughage used in Tan sheep feed, and its substitution affected the intramuscular fat content and altered the expression of intramuscular fat deposition-related genes. The present study lays a solid foundation for further exploring the utilization of C. korshinskii in ruminant husbandry.

Efficiency of some conservation treatments for soil erosion control on unallowable slopes of skid trailsOriginal Paper

Akbar Mazri, Aidin Parsakhoo, Mohsen Mostafa

J. For. Sci., 2020, 66(9):368-374 | DOI: 10.17221/61/2020-JFS

The aim of this study was to determine the suitable conservation treatments to control water erosion from skid trails in ShastKalate forests. Two longitudinal slopes of 20-40% and > 40% were considered as critical slopes for skid trails. Treatments of water diversion ruts, water diversion ruts filled with slash and stones were implemented on each slope. A rubber bar was installed at the end of the slope to convert runoff into collectors. Sampling was done during rainfall events in autumn and winter seasons. Findings indicated that the treatment of water diversion ruts filled with slash was better than the other treatments in the control of sediment and soil loss, especially in the slope class of 20-40%. In the slope class of > 40%, there was not any significant difference between treatments in sediment and soil loss control, but generally water diversion ruts filled with slash and stones were better in soil erosion control than water diversion ruts. In both slope classes, the rainfall intensity of 0.11 mm.h-1 (2.64 mm in 24 h) was the threshold of soil erosion on skid trails. The control of water erosion of soil on skid trails by the operation of water diversions is a suitable treatment for conserving skid trails.

Rapid detection of microbial contamination in UHT milk: practical application in dairy industryFood Analysis, Food Quality and Nutrition

Martina KRAČMAROVÁ, Hana STIBOROVÁ, ©árka HORÁČKOVÁ, Kateřina DEMNEROVÁ

Czech J. Food Sci., 2018, 36(5):357-364 | DOI: 10.17221/24/2018-CJFS

Microbial quality of ultra-high temperature (UHT) milk is usually ascertained by a total bacterial count (TBC) cultivation. But this is time consuming, so there is a tendency to search for faster and simpler methods. We compared three instruments, focusing on shortening the detection time and their suitability for practical use in dairy plants. Two of them, RapiScreen Dairy 1000 and Promilite III, detect microbial contamination by measuring adenosine triphosphate bioluminescence; the third, GreenLight, is based on oxygen consumption analysis. In the laboratory experiments, samples of UHT milk, were spiked with low concentration of microorganisms and then the level of microbial contamination was evaluated using the above-mentioned instruments together with cultivation method as a control. The instruments were also applied in a dairy plant to test 182 real samples. All investigated methods determined microbial quality faster than the TBC, but in some cases false positive and false negative results were obtained. Therefore, precise testing including optimizing pre-incubation time for bacteria enrichment is needed prior to industrial use.

Biochemical profile of urine in guinea pigs (Cavia porcellus)Original Paper

H Cernochova, A Hundakova, E Bardi, Z Knotek

Vet Med - Czech, 2020, 65(10):445-450 | DOI: 10.17221/32/2020-VETMED

Guinea pigs are common patients in veterinary clinics. Knowledge of the urine composition is necessary for the evaluation of their health. We, therefore, analysed the urine of fifty guinea pigs, thirty-two males, and eighteen females, aged between four months and seven years. None of these guinea pigs showed clinical signs of urinary tract diseases. The urine samples were obtained as part of a preventive check-up, during a regular dental check-up or another minor procedure. The urine was acquired by spontaneous micturition after inducing a short-term, light isoflurane anaesthesia. A macroscopic evaluation of the urine samples and a urine dipstick test were used for the preliminary examination. The average pH was determined to be 8.5 ± 0.5, and in three animals, moderate glycosuria was detected using the urine dipsticks. No urobilinogen, ketone bodies, haemoglobin, or blood traces were present in any of the samples. Severe proteinuria was detected in all the samples. The samples were subsequently evaluated in a laboratory for the following values: specific gravity 1 024.40 ± 1.83 kg/m3, osmolality 601.14 ± 52.28 mOsm/kg, total protein 290.16 ± 34.73 mg/l, albumin 12.04 ± 1.92 mg/l, glucose 0.77 ± 0.20 mmol/l, urea 217.60 ± 24.23 mmol/l, creatinine 3.98 ± 0.48 mmol/l, bilirubin 9.63 ± 1.73 μmol/l, calcium 6.14 ± 0.40 mmol/l, phosphorus 4.95 ± 1.30 mmol/l, magnesium 9.86 ± 0.57 mmol/l, sodium 49.15 ± 6.67 mmol/l, potassium 152.21 ± 10.62 mmol/l, chloride 51.14 ± 5.81 mmol/l, activity of gamma-glutamyltransferase 0.72 ± 0.14 μkat/l, alkaline phosphatase 0.56 ± 0.11 μkat/l and lactate dehydrogenase 0.68 ± 0.14 μkat/l. The descriptive values of the urine biochemical parameters of guinea pigs were determined for the first time in this study.

Effects of different N, P, K and Ca levels on tomato yield, quality and fertiliser use efficiencyOriginal Paper

Feng Qu, Jiao Zhang, Xueqiang Ma, Junzheng Wang, Zixing Gao, Xiaohui Hu

Plant Soil Environ., 2020, 66(11):569-575 | DOI: 10.17221/498/2020-PSE

The experiment aimed to obtain a quadratic regression mathematical model of the comprehensive evaluation score of yield, quality, and four macroelements (N, K, P and Ca). The suitable nutrient solution was chosen and verified via computer simulation of the model and the highest comprehensive score in all treatments. Results showed that P, K and Ca had a positive effect on the comprehensive evaluation value of tomato, whereas N showed a negative effect. The optimal formula calculated using the regression equation could promote high-yield and high-quality tomato. The single-plant yield, soluble protein, vitamin C, total sugar, lycopene, and elemental utilisation of K and Ca in the tomato were 13.93, 78.95, 3.29, 20.98, 51.91, 16.69 and 24.14% higher than those in the special formula treatment of Japanese Yamazaki tomato, respectively. In summary, the optimal nutrient solution formula of tomato cultivation was obtained, in which the N, P, K and Ca levels were 24.83, 4.50, 9.49 and 5.73 mmol/L, respectively.

Relationships between soil physicochemical properties and nitrogen fixing, nitrifying and denitrifying under varying land-use practices in the northwest region of ArgentinaOriginal Paper

Carolina Pérez-Brandan, Annabel Meyer, José M. Meriles, Jorgelina Huidobro, Michael Schloter, Silvina Vargas-Gil

Soil & Water Res., 2019, 14(1):1-9 | DOI: 10.17221/192/2017-SWR

The aim of this study was to evaluate the response pattern of diazotrophic microbes, denitrifiers and nitrifiers to different types of land use management, such as soybean monoculture (M) during 5 and 24 years (M5 and M24) and soybean-maize rotation (R) during 4 and 15 years (R4 and R15) in two subsequent years at the time point of flowering. Soil samples from a site recently introduced into agriculture (RUA) and a pristine soil under native vegetation (NV) were used as controls. Abundances of different functional groups of microbes were assessed using the direct quantification of marker genes by quantitative real-time PCR using extracted DNA from rhizosphere samples. In addition, soil chemical and physical properties were analysed and correlated with the abundance data from the functional microbial groups under investigation. Overall, the results indicate that the abundance of nifH genes was higher under R treatments compared to M treatments. The abundance of ammonium monooxygenase genes amoA (AOA) was generally higher under rotation systems and decreased under M24. RUA evidenced a negative effect on the establishment and development of AOA communities. The influence of land use on nirS abundance was inconsistent. However, R treatments showed a high abundance of nirK genes compared to M treatments. In both growing seasons, the abundance of nosZ genes was higher under NV compared with the other treatments. Furthermore, M24 treatment was related to strongly changed chemical and physical soil properties compared with the other sites. As expected, soil samples from RUA showed the strong dynamics of measured parameters indicating the high sensitivity of soils under transition to environmental parameters. Our results also indicated that the long-term crop rotation modified the abundance of the investigated microbial groups compared to the monoculture and increased soil chemical and physical quality. Therefore, our results provide evidence for a stimulatory effect of the long-term crop rotation on the abundance of microbes involved in N transformation.

Effect of heat-shock pre-treatment on tomato plants infected by powdery mildew fungusOriginal Paper

Vladimíra Noľková, Barbora Mieslerová, Lenka Luhová, Jana Piterková, Ondřej Novák, Martina ©pundová, Aleą Lebeda

Plant Protect. Sci., 2019, 55(1):31-42 | DOI: 10.17221/24/2018-PPS

The effect of plant heat-shock (HS) pre-treatment (40.5°C, 2 h) on Pseudoidium neolycopersici development in the susceptible and moderately resistant Solanum spp. genotypes was studied together with biochemical responses (endogenous concentrations of salicylic (SA), jasmonic (JA), abscisic acid (ABA), and peroxidase (POX) activity). In HS pre-treated S. lycopersicum, an acceleration of pathogen, chlorosis and necrosis development, strong SA, JA accumulation, and increased POX activity were detected. In S. chmielewskii, HS pre-treatment caused a slight suppression of pathogen development, increase in JA, ABA concentrations, and POX activity. HS accelerated and strengthened the development of symptoms and biochemical responses to the infection in the susceptible genotype in contrast to moderately resistant genotype with a robust defence response to an infection per se.

Co-administration of vitamin E and selenium in vivo and in vitro ameliorates the toxic effects caused by ivermection and doramectinOriginal Paper

AE Ahmed, MA Al-Kahtani, AM Khalil, AS Alshehri, AA Elghoneimy, ESI Elbehairi, MY Alfaifi, AA Shati, KS Morsy, MA Alshehri, HI El-Mekkawy, AA Elmansi

Vet Med - Czech, 2020, 65(2):71-83 | DOI: 10.17221/74/2019-VETMED

Avermectins are used in animals and humans for their broad-spectrum effects against parasites causing cytotoxicity and damage to the cellular DNA. In this study, we examined the toxicological changes of ivermectin (IVM) and doramectin (DME) with or without the co-administration of vitamin E (Vit. E) and selenium (Se). The drugs used were for animal use. Twenty-five adult male rats were divided into five groups. Group 1 (control) was given saline, Group 2 was given IVM (0.2 mg/kg b.w.), Group 3 was given IVM and Vit. E/Se (80/1.6 mg/kg b.w., respectively), Group 4 received DME (0.2 mg/kg b.w.), and Group 5 received DME and Vitamin E/Se. Both IVM and DME were given by subcutaneous injections whereas Vit. E and Se were given orally. All the treatments were given once per week throughout the eight weeks. Although the doses were off-label use, they were given in a long-term course to unveil their toxicity effects in a clear manner and the response of the amelioration. By 24-h after the 8th week, the rats were sacrificed. Their blood was sampled for the haematological and serobiochemical examinations. Histopathological changes and caspase-3 were determined in the hepatic and renal tissues. The histopathological findings showed that Vit. E and Se reduced the cellular changes induced by IVM or DME, indicating that Vit. E and Se protect against both types of avermectins, and that DME was safer than IVM. The cytotoxicity was assessed on a human embryo kidney (HEK) and skin cells by the SRB/IC50 method and AO/EB (acridine orange-ethidium bromide) staining. Both IVM and DME caused apoptosis in the cultured HEK more than in the skin cells (80% vs. 30%, respectively). The cellular apoptosis in response to the IVM was more than that of DME, and the use of Vit. E and Se reduced the cytotoxicity as observed by caspase-3, in vivo, and IC50, in vitro.

Generation of doubled haploid lines from winter wheat (Triticum aestivum L.) breeding material using in vitro anther cultureOriginal Paper

Osama Zuhair Kanbar, Csaba Lantos, Paul Karumba Chege, Erzsebet Kiss, Janos Pauk

Czech J. Genet. Plant Breed., 2020, 56(4):150-158 | DOI: 10.17221/113/2019-CJGPB

We investigated the anther culture (AC) efficiency of thirteen F4 combinations of winter wheat (Triticum aestivum L.). The genotype dependency was assessed during the induction of the androgenic entities, i.e. embryo-like structures (ELS), regenerated-, green-, albino-, and transplanted plantlets. The number of green plantlets per 100 anthers (GP/100A) varied from 0.36 to 24.74 GP/100A with a mean of 8.31 GP/100A. Albino plantlets (AP) occurred in each combination, ranging from 0.20 to 22.80 AP/100A with an average value of 5.59 AP/100A. Between 25-87.76 doubled haploid (DH) plants per 100 acclimatised plantlets (DH/100ADP), depending on the combination, with a mean of 59.74% were recovered. We have found the highest DH production in the combinations Béres/Midas, Kalász/Tacitus, Béres/Pamier, and Premio/5009. This improves remarkably the choice of basic genetic material in subsequent crossing programmes. These observations emphasise the usability and efficiency of in vitro AC in producing a large number of DH lines for breeding and the applied researches of winter wheat. Although albinism was found in each combination, it was mitigated by the in vitro AC application.

Choice feeding in fattening pigs: Effect of diets differing in nutrient density on feeding behaviour and fattening performanceOriginal Paper

Josef Pichler, Christiane Schwarz, Martin Gierus, Karl Schedle

Czech J. Anim. Sci., 2020, 65(7):247-257 | DOI: 10.17221/111/2020-CJAS

The aim of this study was to determine the proportion of feed consumed by pigs when they had the choice to meet their nutrient requirements offering a low (LND) or a high (HND) nutrient dense diet on animal performance and feeding behaviour. In total 120 barrows and gilts were allotted to three dietary treatments (LND, HND and a feed choice group, FC). Diets were calculated to keep a constant ratio of megajoule net energy (MJ NE) to nutrient standardised ileal digestible (SID) lysine, SID methionine and cysteine, SID threonine, SID tryptophan, Ca, available P and Na. Pigs of the feed choice treatment that could choose between LND and HND chose an energy content between 13.3 and 13.6 MJ ME or rather 10.1 and 10.4 MJ NE. The ratio between LND and HND changed during the growing period to a higher percentage of HND (26.2% : 73.8% in the starter, 22.0% : 78.0% in the grower and 20.0% : 80.0% in the finisher phase). No differences between barrows and gilts were detected regarding the selected diet. As a result, similar zootechnical performance data were observed for HND and FC, whereas LND led to a declined (P < 0.05) performance. Regarding the feeding behaviour no differences in the parameters meal size and daily feeder visits between LND and HND (P > 0.1) were observed. However, within the FC treatment more and greater meals were consumed (P < 0.05) at the HND feeder compared to the LND feeder. Pigs of modern genetics still have the ability to cover their nutrient requirements choosing between diets differing in nutrient density without impairing performance. Furthermore, the results give no indication for the necessity of different energy levels in diets for sexed pigs.

The efficacy of fenbendazole against tapeworm infections in the common carp (Cyprinus carpio L.) in Veµké Blahovo pondsOriginal Paper

Michal Madzunkov, Stanislav Navratil

Vet Med - Czech, 2019, 64(5):231-236 | DOI: 10.17221/28/2018-VETMED

A survey of the pond system in Veµké Blahovo, Dunajská Streda district, Slovak Republic, confirmed the occurrence of tapeworms in carp with a prevalence of 63.5% and mean intensity of 1.7 ± 2.72. The species Khawia sinensis and Atractolytocestus huronensis were identified. We attempted to reduce the occurrence of tapeworms using a medicated feed mixture (granules) with 1% fenbendazole as active substance under controlled conditions. Faeces collected from carp (K2) were examined and the presence of tapeworm eggs was confirmed by the flotation method. Positive carp were divided into three groups; each group, labelled F1 to F3, included 15 individuals. The carp were placed in concrete pools (storage ponds) nourished by fish pond water at the peak of the vegetation period from August 7-17, 2015. The medicated feed mixture was administered to the first two groups (F1 and F2), while the third group was fed with a non-medicated feed mixture and served as the control (F3). A single dose was administered to the F1 group; tapeworm prevalence 24 hours after administration in the F1 group was 26.66% with a mean intensity of 1.3 ± 0.57. The F2 group was fed three times in total with 24-hour intervals between feeding. Tapeworm prevalence 24 hours after the last administration in the F2 group was 13.33% with a mean intensity of 2.0 ± 0.77. The prevalence in the control group was 66.66% with a mean intensity of 2.2 ± 1.62. Khawia sinensis tapeworms responded well to fenbendazole, while A. huronensis tapeworms responded poorly and, despite repeated administration of the active substance, this species remained attached to the intestinal mucosa. When compared with the control group, the reduction in the number of tapeworms was statistically significant (P ≤ 0.05) in the F2 group; however, it was not statistically significant in the F1 group.

Ovarian follicle dynamics and hormonal changes during early pregnancy in Saanen goatsOriginal Paper

I Dogan, MB Toker, S Alcay, D Udum Kucuksen

Vet Med - Czech, 2020, 65(1):8-17 | DOI: 10.17221/65/2019-VETMED

This study is aimed at describing the ovarian follicular dynamics, corpora lutea and their hormonal control during early pregnancy in Saanen goats. The ovaries of pregnant goats (n = 10) were monitored daily for follicles (≥ 2 mm) and corpora lutea by transrectal ultrasound over the 35 days after mating. Blood samples were collected by jugular venipuncture at the time of ultrasonography and were analysed for the concentrations of oestradiol (E2) and progesterone (P4), inhibin, FSH (follicle-stimulating hormone) and LH (luteinizing hormone). The pattern of follicular growth was characterised by five (n = 2; 20 %), six (n = 5; 50 %) and seven (n = 3; 30 %) follicular waves during early pregnancy. The first corpora lutea (size 6.8 ± 0.4 mm, mean + SEM) were detected at 5.0 ± 0.3 days after the mating with a maximum diameter (12.2 ± 0.3 mm) observed on day 24.0 ± 1.1 of pregnancy. The dominant follicle diameter of waves 1 and 4, and the duration of waves 1-4 and 7 were maximal during the early pregnancy period (P < 0.05). In addition, the inter-wave interval of the 5 waves was significantly (P < 0.05) longer compared to the six and seven inter-wave intervals (7.0 ± 0.1, 5.8 ± 0.1 and 5.0 ± 0.2 days, respectively). Although the number of small and medium-sized follicles did not differ with the days post-breeding, the number of large-sized follicles in the same period significantly decreased between 16 and 26 days and was negatively correlated with the period of pregnancy (P < 0.05). The plasma LH and E2 concentrations were negatively correlated with the P4 concentration. The inhibin concentrations were negatively correlated with FSH, but positively correlated with the number of large-sized follicles. These results indicate that ovarian follicular growth during the first 35 days of pregnancy in goats was characterised by a wave-like pattern and there was a close relationship between the number of FSH peaks and the number of follicular waves.

Haematological reference intervals in captive African Grey parrots (Psittacus erithacus)Original Paper

H Gaspar, F Bargallo, J Grifols, E Correia, ML Pinto

Vet Med - Czech, 2021, 66(1):24-31 | DOI: 10.17221/15/2020-VETMED

The African Grey parrot (Psittacus erithacus) is one of the most popular avian pets in exotic animal practice. In this study, blood samples (n = 459) from healthy African Grey parrots (n = 239) were collected for haematological testing. Reference intervals were determined according to the guidelines of the American Society of Veterinary Clinical Pathology with the Reference Value Advisor (v2.1) freeware. The calculated reference intervals (RIs) were: packed cell volume 38-59%; haemoglobin 105-154 g/l; RBC 2.3-3.3 106/µl; MCV 145.5-199.7 fl; MHC 38.3-55.6 pg; MCHC 232-313 g/l; WBC 2.7-12.6 103/µl; heterophils 1.2-10.2 103/µl; lymphocytes 0.8-4.3 103/µl; monocytes 0.0-0.6 103/µl; basophils 0.0-0.1 103/µl; eosinophils 0.0-0.2 103/µl. To the best of our knowledge, this is the first study in psittacines to use such a high number of birds and samples to establish haematological species-specific RIs, providing a valuable tool to professionals dealing with the health of African Grey parrots.

Antifungal activity of microbial nanoparticles derived from Chaetomium spp. against Magnaporthe oryzae causing rice blastOriginal Paper

Jiao Jiao Song, Kasem Soytong, Somdej Kanokmedhakul, Kwanjai Kanokmedhakul, Supattra Poeaim

Plant Protect. Sci., 2020, 56(3):180-190 | DOI: 10.17221/41/2019-PPS

The Magnaporthe oryzae isolate PO2 was proven to cause rice blast var. PSL 2 in this study. Chaetomium elatum, Chaetomium lucknowense and Chaetomium brasiliense were antagonised to M. oryzae. The hexane extract of C. brasiliense gave the highest inhibition of the spore production with an ED50 of 35 ppm, the EtOAC extract of C. lucknowense inhibited the spore production at 57 ppm and the EtOAC extracts of C. elatum inhibited the spore production at 106 ppm. The nano-CLM (C. lucknowense) inhibited the spore production at 5.24 ppm, the nano-CBH (C. brasiliense) inhibited the spore production at 6.86 ppm and the nano-CEE (C. elatum) inhibited the spore production at 7.89 ppm. The rice leaves treated with nano-CBH from C. brasiliense produced Sakuranertin and Oryzalexin B as seen on the thin layer chromatography where the Rf value was 0.08 assumed to be Sakuranertin, and the Rf value of 0.28 supposed to be Oryzalexin B. It was found that the nanoparticles act as elicitors to induce immunity in rice plants through the production of phytoalexin.

Presence and antimicrobial resistance of coagulase-negative staphylococci isolated from animals in a Veterinary Teaching Hospital in CyprusOriginal Paper

H Sukur, OM Esendal

Vet Med - Czech, 2020, 65(5):191-198 | DOI: 10.17221/166/2019-VETMED

Coagulase-negative staphylococci (CoNS) are a group of commensal microorganisms residing on the skin and mucous membranes of both humans and animals. Until recently, they have been regarded as non-pathogenic to livestock and companion animals, but since then, their clinical importance in veterinary medicine has increased with the discovery of their potential pathogenic roles in animals causing skin and soft tissue infections together with spontaneous abortions and mastitis. Scientific data concerning the presence of CoNS in North Cyprus are very limited. Therefore, the purpose of the study reported herein was to investigate the presence and antimicrobial resistance patterns of CoNS species isolated from various animals presented at the Veterinary Teaching Hospital in North Cyprus between July 2018 and 2019. Staphylococci were isolated from 37.0% (87/235) of the samples submitted, within which 60.9% (53/87) and 39.1% (34/87) were identified as coagulase-positive staphylococci (CoPS) and coagulase-negative staphylococci (CoNS), respectively. Among the CoNS, S. chromogenes was the most predominantly isolated species (14/34, 41.2%), followed byS. capitis (5/34, 14.7%) and S. simulans (4/34, 11.8%). Of these 34 CoNS, 24 (70.6%) and 10 (29.4%) were identified as MRCoNS and MSCoNS, respectively. The CoNS isolates showed relatively high levels of resistance towards amoxicillin/clavulanic acid (19/34, 55.9%), tetracycline (14/34, 41.2%) and penicillin (13/34, 38.2%). In conclusion, the presence of CoNS, especially MRCoNS, and the detection of multiple drug resistant (MDR) species with a high prevalence were regarded as being important since they might limit and have negative effects on the therapeutic treatment options of staphylococcal infections in animals, and might have both public and veterinary concerns.

Entomopathogenic nematodes: can we use the current knowledge on belowground multitrophic interactions in future plant protection programmes? - ReviewReview

Anamarija Jagodič, Stanislav Trdan, ®iga Laznik

Plant Protect. Sci., 2019, 55(4):243-254 | DOI: 10.17221/24/2019-PPS

Plants under herbivore attack emit mixtures of volatiles that can attract the natural enemies of the herbivores. Entomopathogenic nematodes (EPNs) are organisms that can be used in the biological control of insect pests. Recent studies have shown that the movement of EPNs is associated with the detection of chemical stimuli from the environment. To date, several compounds that are responsible for the mediation in below ground multitrophic interactions have been identified. In the review, we discuss the use of EPNs in agriculture, the role of belowground volatiles and their use in plant protection programmes.

Cost analysis of drying process by studying its kinetic parameters: A new study in Mexican chilliesOriginal Paper

José Carrera-Escobedo, Oscar Cruz-Domínguez, César Guzmán-Valdivia, Victor Carrera-Escobedo, Mario García-Ruiz, Héctor Durán-Muñoz

Czech J. Food Sci., 2020, 38(6):375-387 | DOI: 10.17221/96/2020-CJFS

The drying process of vegetables is a widely used technique for food conservation. However, this process can be expensive, and the cost highly depends on the ventilation, drying temperature and drying characteristics of the chillies. The contribution of this new study was to obtain the drying kinetics parameters of two different types of Mexican Capsicum annuum (Puya and Mulato) and model it at different temperatures with two different ventilation levels. The aim of this study is to provide a method to analyse the cost of the drying process by studying its drying kinetics parameters. The experimental results were fitted to Weibull distribution and Newton's model, obtaining an adequate numerical fit at different drying temperatures. The Weibull distribution demonstrates to be a better fit than Newton's model. Drying kinetics parameters were also studied by a diffusive model with effective diffusivity. The effect of temperature on the diffusivity was described by the Arrhenius equation with activation energy of 49.7 kJ mol-1 for Puya and 24.1 kJ mol-1 for Mulato. The ventilation effect on chilli drying kinetics parameters was qualitatively assessed. As expected, the ventilation effect improved the drying rate and reduced the drying time, and consequently the cost of the drying process was reduced. In addition, a new method is presented to evaluate the cost of the drying process considering the kinetic parameters obtained. This new method allows evaluating the cost of the drying process in a simple way and with little experimental work. Consequently, it is possible to greatly reduce the cost of the drying process.

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