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Results 2401 to 2430 of 4598:

Common carp (Cyprinus caprio) and European catfish (Sillurus glanis) from the Danube River as sources of fat soluble vitamins and fatty acidsOriginal Paper

Mona STANCHEVA, Albena MERDZHANOVA, Diana A. DOBREVA, Lyubomir MAKEDONSKI

Czech J. Food Sci., 2014, 32(1):16-24 | DOI: 10.17221/31/2013-CJFS

The total content of fat soluble vitamins and their percentages in the recommended daily intake for humans per 100 g portion, fatty acids composition, the atherogenic (IA) and thrombogenicity (IT) indices in two freshwater fish species - Common carp (Cyprinus carpio) and European catfish (Sillurus glanis) were investigated. Retinol contents in fresh edible tissues of the Common carp and European catfish were found to be 30.8 ± 3.4 mg/100 g wet weight (ww) for the Common carp 30.8 ± 3.4 µg/100 g ww and 1.9 ± 0.1 µg/100 g ww for the European catfish, cholecalciferol contents 14.8 ± 1.0 and 3.1 ± 0.1 µg/100 g ww, and α-tocopherol contents 2764.5 ± 44.0 and 2182.5 ± 31.5 µg/100 g ww, respectively. The sum of monounsaturated FA accounted for 50.02% (catfish) and 23.15% (carp). Polyunsaturated FA (PUFA) showed a higher level in the carp (36.75%) and a lower one in the catfish (21.64%). Both fishes are good sources of cholecalciferol in terms of the recommended daily intake of vitamins established in Bulgaria. Three fat soluble vitamins, n-3 PUFAs content, and IA value were higher in carp. IT values were similar for both species.

Effects of vitamin D3 on expression of defensins, Toll-like receptors, and vitamin D receptor in liver, kidney, and spleen of Silky FowlOriginal Paper

S.M. Li, L.H.Ouyang, D.G. Zhou

Czech J. Anim. Sci., 2013, 58(1):1-7 | DOI: 10.17221/6519-CJAS

The expression of avian β-defensins (AvBDs), Toll-like receptors (TLRs), and vitamin D receptor (VDR) following in vivo vitamin D3 injection was studied. Healthy 90-day Silky Fowls were abdominally injected with vitamin D3 or untreated. Real-time PCR analyses revealed that injection of vitamin D3 significantly (P < 0.05) up-regulated the expression of TLRs (TLR2, TLR5), VDR, AvBDs (AVBD-6, GAL-1), and 24-hydroxylase (CYP24A1) in the tissues (liver, spleen, and kidney) at various times 8-24 h post injection. These results suggest that expression of VDR, AvBDs, and TLRs seems to be induced by vitamin D3 and it was concluded that the tissues expressing TLRs and VDR respond to vitamin D3 and in turn upregulate these tissues cellular functions to synthesize AvBDs. Intraperitoneal injection of vitamin D3 likely resulted in enhancing the expression of AvBDs, TLRs, and VDR, which providedinsight into factors important for the control of the innateimmune response in the chickens.

The role of nitric oxide synthase isoforms in aged porcine oocytesOriginal Paper

J. Nevoral, T. Krejčová, J. Petr, P. Melicharová, A. Vyskočilová, M. Dvořáková, I. Weingartová, E. Chmelíková, L. Tůmová, K. Hoąková, V. Kučerová-Chrpová, M. Sedmíková

Czech J. Anim. Sci., 2013, 58(10):453-459 | DOI: 10.17221/6994-CJAS

In the sphere of reproductive biotechnologies, the demand for sufficient numbers of high-quality oocytes is still increasing. In some cases, this obstacle is overcome by in vitro prolonged cultivation. However, a prolonged oocyte culture is accompanied by changes called ageing. Ageing is manifested by spontaneous parthenogenetic activation, programmed cell death or lysis. Various substances, such as caffeine or dithiothreitol, have been tested for ageing suppression. In this respect, research into gasotransmitters (hydrogen sulphide, carbon monoxide, and nitric oxide) has currently been intensified. The objectives of the present study were to localize nitric oxide synthases (NOS) and to evaluate NOS inhibition of aged porcine oocytes. We demonstrated the presence of NOS isoforms in oocyte cultivation prolonged by 24, 48, and 72 h. After 72 h of prolonged cultivation, NOS inhibition by the non-specific inhibitor L-NAME or the specific inhibitor aminoguanidine caused suppression both of programmed cell death and lysis. Although NOS amount rapidly decreased after the 72-h cultivation, changes induced by NOS inhibition were statistically significant. We can presume that NOS play an important physiological role in porcine oocyte ageing.

Selenite and selenate affect the fatty acid profile in in vitro incubated ovine ruminal fluid containing linseed oilOriginal Paper

M. Czauderna, J. Kowalczyk, M. Marounek

Czech J. Anim. Sci., 2013, 58(7):328-341 | DOI: 10.17221/6863-CJAS

The influence of selenite (SeIV) or selenate (SeVI) added to ovine ruminal fluid containing linseed oil (LO) on the profile of fatty acids (FA), particularly conjugated linoleic acid (CLA) isomers, was investigated. The ruminal fluid was incubated in vitro at 39°C under CO2 either alone (the control fluid) or with LO (3.3 mg/ml) or with a combination of LO with either a low (0.167 μg/ml) or high (1.67 μg/ml) level of Se as SeIV or SeVI. LO added to ruminal fluids also provides an extra source of energy. The tubes with the examined fluids were removed after 0, 6, 12, 18, or 24 h of in vitro incubation and then analyzed to determine the FA levels. The lower and higher concentration of SeIV in the fluids with the LO revealed negligible effect on the concentration of the sum of the CLA isomers (∑CLA) in the fluid compared with the fluid with LO alone. The addition of a higher amount of SeIV to the fluid containing LO usually decreased the concentration of ∑CLA compared with the fluid containing the lower concentration of SeIV and LO. The concentration of c9t11c15C18:3 (cLNA) in the fluids with LO, irrespective of the presence of extra Se, increased throughout the incubations, although the addition of SeIV or SeVI to the fluids containing LO numerically reduced the increase of the concentration of cLNA compared with the fluid with LO alone. The concentration sum of the C18:1 isomers (ΣC18:1) in the control fluid numerically decreased throughout the incubations, while LO added to the fluid increased the concentration of ΣC18:1 throughout the incubations. LO added to the fluid, irrespective of the presence of SeIV or SeVI, significantly increased the concentration of ΣC18:1 compared with the control fluid and the fluids with SeIV or SeVI. The concentrations of C16:0 and C18:0 in the control fluid and the fluids containing SeIV or SeVI numerically increased throughout the incubations and were usually lower than in the fluids containing LO without or with SeIV or SeVI. The concentration of C18:3n-3 decreased throughout the incubation of the fluids containing LO, irrespective of the presence of SeIV or SeVI. LO added to the fluids, irrespective of the presence of SeIV or SeVI, increased the concentration of C18:2n-6 compared with the control fluid and the fluids with SeIV or SeVI. The higher concentration of SeIV or SeVI in the fluid with LO most efficiently increased the concentration of c5c8c11c14c17C20:5 compared with the control fluid or the fluids containing LO, irrespective of the presence of the lower concentration of SeIV or SeVI. LO added to the fluid, irrespective of the presence of SeIV or SeVI, increased the concentration of polyunsaturated FA compared with the control fluid or the fluids containing SeIV or SeVI.

Antioxidant potential of Moringa oleifera leaf extract for the stabilisation of butter at refrigeration temperatureOriginal Paper

Muhammad NADEEM, Muhammad ABDULLAH, Imtiaz HUSSAIN, Saima INAYAT, Arshad JAVID, Yasir ZAHOOR

Czech J. Food Sci., 2013, 31(4):332-339 | DOI: 10.17221/366/2012-CJFS

The antioxidant potential of a leaf extract of Moringa oleifera Lam. (Moringaceae) - LEMO was studied for the stabilisation of butter at refrigeration temperature. LEMO was obtained by extracting the ground and dried leaves with 80% ethanol at room temperature for 48 hours. LEMO was added into butter at three different concentrations, i.e. 400 ppm (T1), 600 ppm (T2), and 800 ppm (T3) and compared with a treatment which was not supplemented with LEMO, i.e. control (T0). The addition of LEMO at all three levels did not have any effect on butter composition. Free fatty acids, peroxide value and p-anisidine value (AnV) of T2 after 90 days of storage were 0.10%, 0.71 meq/kg and 14.85 as compared to the control 0.16%, 1.24 meq/kg and 28.85, respectively. Peroxide value of the control and T2 in Schaal oven test after 5 days in oven was 8.19 and 2.99 meq/kg, respectively. Induction period and overall acceptability score of the control and T2 were 6.35 h, 8.91 h and 7.6, 7.2, respectively. The results of this study suggest that LEMO at 600 ppm may be used for reasonable storage stability of butter at refrigeration temperate with acceptable sensory characteristics.

Market value assessment of hops by modeling of weather attributes

M. Pavlovic, V. Pavlovic, C. Rozman, A. Udovc, D. Stajnko, D. Wang, M. Gavric, S. Srecec

Plant Soil Environ., 2013, 59(6):267-272 | DOI: 10.17221/831/2012-PSE

The effect of major weather factors on the quality of hops in Slovenia from 1994 to 2009 is analyzed and discussed. For this purpose, the three main varieties, namely Savinjski golding, Aurora and Bobek were merged into a model variety which we called Virtual. Through assessment of correlation coefficients, we tried to find specific times of the year when the weather conditions affect the alpha-acid content with a view toward prediction. The most significant time periods of weather that influenced the alpha-acid contents of hops during the growing season are identified as attributes of air temperatures calculated during the interval from the 24th to the 31st week (T2431; r = -0.92;P < 0.01), as attributes of rainfall and sunshine duration calculated during the interval from the 25th to the 29th week (R2529; r = 0.83; P < 0.01 and S2529, r = -0.76; P < 0.01), and as attributes of air humidity calculated during the interval from the 28th to the 33rd week (RH2833; r = 0.77; P < 0.01).

Genetic and environmental parameters estimation for milk traits in Slovenian dairy sheep using random regression modelOriginal Paper

A. Komprej, ©. Malovrh, G. Gorjanc, D. Kompan, M. Kovač

Czech J. Anim. Sci., 2013, 58(3):125-135 | DOI: 10.17221/6669-CJAS

(Co)variance components for daily milk yield, fat, and protein content in Slovenian dairy sheep were estimated with random regression model. Test-day records were collected by the ICAR A4 method. Analysis was done for 38 983 test-day records of 3068 ewes in 36 flocks. Common flock environment, additive genetic effect, permanent environment effect over lactations, and permanent environment effect within lactation were included into the random part of the model and modelled with Legendre polynomials on the standardized time scale of days in lactation. Estimation of (co)variance components was done with REML. The eigenvalues of covariance functions for random regression coefficients were calculated to quantify the sufficient order of Legendre polynomial for the (co)variance component estimation of milk traits. The existing 13 to 24% of additive genetic variability for the individual lactation curve indicated that the use of random regression model is justified for selection on the level and shape of lactation curve in dairy sheep. Four eigenvalues sufficiently explained variability during lactation in all three milk traits. Heritability estimate for daily milk yield was the highest in mid lactation (0.17) and lower in the early (0.11) and late (0.08) lactation. In fat content, the heritability was increasing throughout lactation (0.08-0.13). Values in protein content varied from the beginning toward mid lactation (0.15-0.19), while they rapidly increased at the end of lactation (0.28). Common flock environment explained the highest percentage of phenotypic variability: 27-41% in daily milk yield, 31-41% in fat content, and 41-49% in protein content. Variance ratios for the two permanent environment effects were the highest in daily milk yield (0.10-0.27), and lower in fat (0.04-0.08) and protein (0.01-0.10) contents. Additive genetic correlations during the selected test-days were high between the adjacent ones and they tended to decrease at the extremes of the lactation trajectory.

Use of sawdust, coco soil and pumice in hydroponically grown strawberryOriginal Paper

E. Marinou, A. Chrysargyris, N. Tzortzakis

Plant Soil Environ., 2013, 59(10):452-459 | DOI: 10.17221/297/2013-PSE

Strawberry (Fragaria × ananassa Duch.) plants were grown hydroponically in different ratio of sawdust (Saw-100), coco soil (Coc-100) and/or pumice (Pum-100) mixtures. Leaf number doubled in plants grown in Saw-100 while runners (stolons) number increased up to 70% in plants grown in Coc-100 compared with the control treatment (Pum-100). Fruit number increased (up to 50%) in plants grown in Pum-100. Leaf stomatal conductance, photosynthetic rate and internal concentration of CO2 differentiated according to the plant vegetative or reproductive stage and/or substrate medium. Leaf and stem fresh weight as well as leaf area was increased (up to 32, 24 and 44%, respectively) in case of Coc-100 compared with the Saw-100 or Pum-100. Plant yield was doubled when Pum-Saw (50-50) was used compared with the Saw-100, which is due to the reduced fruit number produced rather than the difference in fruit fresh weight. Substrate affected fruit quality parameters. The present findings highlight the putative use of organic medium i.e. Sawdust on top of the widely used coco soil as substrate medium in strawberry culture.

Characterization of M. laxa and M. fructigena isolates from Hungary with MP-PCR

Sz. Sződi, H. Komjáti, Gy. Turóczi

Hort. Sci. (Prague), 2012, 39(3):116-122 | DOI: 10.17221/216/2011-HORTSCI

Monilinia laxa (Monilia laxa), Monilinia fructicola (Monilia fructicola) and Monilinia fructigena (Monilia fructigena) are the causal agents of brown rot on pome and stone fruits in Hungary. Forty-five isolates collected from different hosts, different years in several orchards were used for characterization of the M. laxa and M. fructigena population in Hungary. The isolates were identified on species level based on morphological and molecular biological methods; out of these 24 were M. laxa, 20 were M. fructigena and 1 was M. fructicola. Populations of the three Monilinia species were studied with microsatellite primers and the degree of genetic diversity within the species was measured. The population structure analysis revealed that genetic diversity within M. laxa subpopulations was HS= 0.1599, while within M. fructigena subpopulations was HS= 0.2551. The total genetic diversity was HT= 0.3846, while genetic diversity between M. laxa and M. fructigena subpopulations was DST= 0.1771. No clustering relationship was observed among isolates by the different years or hosts.

Intraday variation of metabolic key indicators in serum of dairy cows between week 2 antepartum and week 12 postpartumOriginal Paper

S. Wiedemann, K. Horstmann, M. Piechotta, U. Meyer, G. Flachowsky, M. Kaske

Czech J. Anim. Sci., 2013, 58(8):343-350 | DOI: 10.17221/6900-CJAS

Metabolic diseases during early lactation in dairy cows can be routinely diagnosed assessing key indicators in blood. The objectives of the present study were to characterize the impact of interindividual along with intraday variation on specific metabolites and to investigate the effect of the sampling time point relative to calving. Serum samples of four high-yielding, clinically healthy, multiparous dairy cows (body weight 589 ± 27 kg) were obtained in 3-h intervals during 24-h intervals throughout the transition period and early lactation (week -2 antepartum (ap), weeks 1, 2, 3, 5, 7, and 12 postpartum (pp)). The lowest intraday variation (less than 15%) as indicated by relative coefficients of variation (CV) was found for glucose, cholesterol, and aspartate aminotransferase (AST). Intraday variation characterized by a CV between 15 and 30% was typical of urea, β-hydroxybutyrate (BHB), total bilirubin, and non-esterified fatty acids (NEFA). The highest intraday variation (CV > 30%) was assessed for insulin. Week relative to calving had significant influence on interindividual means of BHB, NEFA, insulin, and cholesterol in blood, but did not affect the interindividual variation of all parameters investigated. No significant intraday variation patterns were found. It is concluded that the considerable intraday variation of especially BHB and NEFA has to be taken into account in herd health monitoring for estimating the proportional outcome in respect to animals exceeding thresholds for specific metabolic key parameters.

Long term effects of different soil tillage systems on maize (Zea mays L.) yields

®. Videnović, M. Simić, J. Srdić, Z. Dumanović

Plant Soil Environ., 2011, 57(4):186-192 | DOI: 10.17221/443/2010-PSE

The effects of three tillage systems: no-tillage (NT), reduced tillage (RT) and conventional tillage (CT), and three levels of fertilization (0, 258 and 516 kg/ha NPK (58:18:24)), on the maize yield during ten years (1999-2008) were analyzed on the chernozem soil type in Zemun Polje, Serbia. Statistical analyses showed significant effects of all three factors i.e., year, soil tillage and amount of fertilizers, and their interactions on the maize yield. The ten-year averages showed that the highest yields were observed with CT (10.61 t/ha), while the averages with RT and NT were lower (8.99 t/ha and 6.85 t/ha, respectively). The results of the influence of the amount of the applied fertilizers on maize yield showed that the lowest yield was in the zero level of fertilization 7.71 t/ha, while the yield was raised when the 258 kg/ha and 516 kg/ha NPK were applied (9.18 t/ha and 9.56 t/ha, respectively). Analyzing the influence of the soil tillage systems on maize production with respect to the amounts of applied fertilizers, this research revealed the benefits of CT under the presented agroecological conditions, irrespective of the level of applied fertilizer.

Chemical composition and in sacco ruminal degradation of tropical trees rich in condensed tanninsOriginal Paper

Z. Belachew, K. Yisehak, T. Taye, G.P.J. Janssens

Czech J. Anim. Sci., 2013, 58(4):176-192 | DOI: 10.17221/6712-CJAS

The study was aimed at determining the chemical composition, in sacco ruminal dry matter and organic matter degradability of leaves and fruits of tropical condensed tannin rich multipurpose tree species (MPTS). The MPTS studied were Ekebergia capenesis, Ficus sycomorus, Maesa lanceolata, and Rhus glutinosa. Chemical composition of dry matter (DM), crude protein (CP), crude ash (CA), ether extract (EE), crude fibre (CF), neutral detergent fibre (NDF), non-fibre carbohydrates (NFC), and condensed tannin (CT) was determined. In sacco rumen degradability was measured using three rumen fistulated Holstein Friesian-Boran cross steers at 0, 6, 12, 24, 48, 72, and 96 h. The DM and organic matter (OM) degradability data were fitted to the equation Y = a + b(1 - e-ct). The values for each chemical constituent ranged 5.43-11.49% (CA), 7.97-17.06% (CP), 1.57-31% (EE), 12.20-27.5% (CF), 5.84-39.30% (NFC), and 7.2-16.72% (CT). Ekebergia capensis leaves had the greatest values for slowly degradable fraction (b), effective degradability (ED), and rate of degradation (c) in DM (P < 0.001) whereas E. capensis fruit had significantly the greatest soluble fraction (a), potential degradability (b), and effective degradability (ED) values as compared to the a, PD, and ED values in the fruits of other plants(P < 0.001). Yet in OM degradation kinetics, the greatest and least values of potential degradability (PD) were recorded for F. sycomorus (89.89%) and E. capensis (55.90%) leaves (P < 0.001). Similar to the rapidly soluble fraction a, ED was found to be the greatest in fruits as compared to leaves of the plants (P < 0.001). Generally variation of plant parts led to significant differences in chemical composition, DM, and OM degradability and the degradable parameters. The leaves and fruits recorded more than 60% DM and OM degradability at 24 h, which implied that they were all greatly degradable in the rumen.

Effect of age at first calving on longevity and fertility traits for Holstein cattleOriginal Paper

L. Zavadilová, M. ©típková

Czech J. Anim. Sci., 2013, 58(2):47-57 | DOI: 10.17221/6614-CJAS

Effects of age at first calving (AFC) on functional longevity of Czech Holstein cows and their reproduction traits in the first lactation were analyzed using the first lactation data of 605 538 Holstein cows first calved from 1993 to 2008. Three classes were formed for AFC: low age class (16-24 months), average age class (25-30 months), and high age class (33-46 months). Effects of AFC on length of productive life (LPL), days open (DO), days between calving and first service (CTFS), and days between first service and conception in the first lactation (FSTC) were estimated by survival and linear model analyses. It was found that LPL was on average slightly shorter for cows with higher AFC who showed also a lower proportion of higher lactations and tended to longer DO and longer CTFS in the first parity. The results of survival analysis indicate that cows with higher AFC had a tendency to shorter LPL (risk of culling 1.118) and to longer DO (risk of conception 0.758), CTFS (risk of conception 0.757), and FSTC (risk of conception 0.754) in comparison with cows with lower AFC. When the effect of fertility traits on LPL was analyzed, it was found that longer DO, CTFS, and FSTC were connected with a lower risk of culling (0.132, 0.183, 0.206) regardless of the particular AFC group. In linear model analysis, the effects of AFC group were estimated from two datasets, where the second dataset included also the missing values of fertility traits. It was found that the cows group with the highest AFC showed worse values of fertility traits (16.75, 19.69, 20.46 days) than the cows groups with lower AFC. Results of all analyses showed that a high AFC is connected with worse cow's fertility at the first lactation and with lower cow's LPL.

Novel SNPs of the porcine TRIP12 are associated with water holding capacity of meatOriginal Paper

H.T.P. Loan, E. Murani, S. Maak, S. Ponsuksili, K. Wimmers

Czech J. Anim. Sci., 2013, 58(11):525-533 | DOI: 10.17221/7048-CJAS

Degradation of proteins during maturation of meat, mediated by the calpain/calpastatin system and the ubiquitination system, largely affects the tenderness and the water holding capacity (WHC) of meat. The thyroid hormone receptor interacting protein 12 (TRIP12) is known as a HECT domain-containing E3 ubiquitin-protein ligase that recognizes protein substrates for ubiquitination. This study aims to identify polymorphisms of the TRIP12 gene and to evaluate the relationship between genotype, transcript abundance, and meat quality traits in pigs. Two synonymous SNPs (XM_003484315.1:c.2211T>C, c.4957A>C) were identified that segregated among animals of herds of the breed German Landrace (DL, n = 269) and the commercial crossbreed of Pietrain × (German Large White × German Landrace) (PiF1, n = 300). Statistical analysis revealed associations between TRIP12 polymorphisms and the organismal traits related to water holding capacity, i.e. conductivity 45 min postmortem (CON1, P < 0.1) and pH 24 h postmortem (pH24, P < 0.1). Haplotype analysis revealed consistent effects on muscle CON1 in the two populations (P < 0.1). Carriers of the minor alleles C at the two polymorphic sites tended to have higher transcript abundance as well as higher water holding capacity. The integrated analysis of genotypic and haplotypic variation, transcript abundance, and technological parameters of WHC indicates that the XM_003484315.1:c.2211T>C and c.4957A>C of TRIP12 are in linkage disequilibrium with a causal factor located in a cis-regulatory region, which affects in the first instance gene expression and in the second traits related to water holding capacity. Our results provide statistical-genetical evidence supporting TRIP12 as a functional candidate gene for water holding capacity of porcine M. longissimus dorsi.

Effects of Aroclor 1254 on LH and 17,20β-P secretion in female Prussian carp (Carassius gibelio Bloch) in the spawning seasonOriginal Paper

M. Socha, M. Sokołowska-Mikołajczyk, P. Szczerbik, J. Chyb, P. Epler

Czech J. Anim. Sci., 2013, 58(8):375-380 | DOI: 10.17221/6904-CJAS

The effects of Aroclor 1254 on the secretion of luteinizing hormone (LH) and 17,20β-dihydroxy-4-pregnen-3-one (17,20β-P) in female Prussian carp (Carassius gibelio Bloch) at the time of their natural spawning were determined. Aroclor 1254 at doses of 0.01, 0.1, and 1 mg/kg body weight was dissolved in 500 ml of oil and was administered three times intraperitoneally or rectally to female Prussian carp every 24 h for three days. Blood samples were collected after 3 days of Aroclor 1254 administration to determine the LH and 17,20β-P concentrations using ELISA. At 6, 12, and 24 h after injection of gonadotropin-releasing hormone analogue (GnRH-A) blood samples were collected for stimulated LH secretion determination. Aroclor 1254 administered intraperitoneally (0.1 and 1 mg/kg)and rectally (0.01 and 1 mg/kg) significantly increased spontaneous LH secretion. In the case of GnRH-A-stimulated LH release, Aroclor 1254 (administered intraperitoneally only) at concentrations of 0.1 and 1 mg/kg significantly decreased gonadotropin release. The intraperitoneal injections of the lowest tested concentration of Aroclor 1254 also significantly decreased 17,20β-P secretion. The results show that Aroclor 1254 can affect the reproductive system of Prussian carp by changing the secretion of two very important hormones, LH and 17,20β-P, at the time of natural spawning.

Determination of fluoride in plant material using microwave induced oxygen combustion

Emanuel ©ucman, Jiří Bednář

Czech J. Food Sci., 2012, 30(5):438-441 | DOI: 10.17221/480/2011-CJFS

Fluorine is essential in human and/or animal nutrition, thus it is important to know its concentration in a diet. One of the important sources of fluorine for humans is tea, containing relatively high amounts of this trace element. A method for fluoride determination in various kinds of tea using microwave supported sample preparation in a high pressure oxygen atmosphere followed by potentiometry with a fluoride ion-selective electrode were described. The parameters of the microwave device for such combustion procedure were checked and optimised in order to find settings ensuring complete sample combustion and/or absorption of the analyte in the absorption solution. For the ion-selective electrode measurement, the technique of standard addition was chosen. The Nernstian slope of the fluoride ion-selective electrode was measured and calculated in the concentration range in which the potential of samples occurred. Concentrations of fluorides in tea in the range from 24.5 mg/kg to 254.5 mg/kg were found. In order to check the accuracy of the method certified reference materials were used. The precision expressed as the relative standard deviation ranged from 3.7% to 15.9%. The method is fast, accurate and reliable for this kind of analysis.

Genetic variability for coloured caryopses in common wheat varieties determined by microsatellite markersOriginal Paper

Milena MUSILOVÁ, Václav TROJAN, Tomáą VYHNÁNEK, Ladislav HAVEL

Czech J. Genet. Plant Breed., 2013, 49(3):116-122 | DOI: 10.17221/160/2012-CJGPB

Products made from wheat are the most important components of the human diet, and could also become a source of functional foods and feed ingredients, e.g. minerals, vitamins and/or phytochemicals. The caryopses of certain wheat genotypes contain antioxidants, i.e. anthocyanins or carotenoids, which cause purple, blue or yellow coloration. The first step before the introduction of these traits into individual wheat cultivars is the characterization of relationships and the possibility of new gene combinations. In this study, relationships among 24 genotypes with different types of caryopsis colour were investigated by means of microsatellite markers. Using 44 SSR (Simple Sequence Repeat) markers it was possible to detect a total of 184 alleles; on average, approximately 4 alleles were detected at a microsatellite locus. Using a set of 5 SSR markers (Xgwm636, Xbarc077, Xwmc262, Xgwm397 and Xwmc219) with PIC (polymorphic information content) values higher than 0.70, it was possible to differentiate among all the genotypes analysed. A dendrogram was created on the basis of all SSR markers, and showed that the genotypes were divided into two groups. Three, and one genotype with purple and blue caryopsis, respectively, belonged to one cluster, while the remaining twenty formed the second, greater cluster, which was subdivided into 2 sub-clusters: one of them involved genotypes with blue caryopses, and the other those with yellow and red caryopses. The genotype of tall wheatgrass (Thinopyrum ponticum), as a possible donor of genes responsible for blue caryopses, was also classified. These results can be used in wheat breeding programmes aimed at the selection of functional foodstuffs.

Inhibition of c-Jun N-terminal kinase (JNK) suppresses porcine oocyte ageing in vitroOriginal Paper

M. Sedmíková, J. Petr, A. Dörflerová, J. Nevoral, B. Novotná, T. Krejčová, E. Chmelíková, L. Tůmová

Czech J. Anim. Sci., 2013, 58(12):535-545 | DOI: 10.17221/7088-CJAS

Oocyte ageing is a complex of processes that occur when matured in vitro oocytes are, after reaching the metaphase II stage, exposed to further in vitro culture. Aged oocytes remaining at the metaphase II stage undergo spontaneous parthenogenetic activation, or cellular death, through apoptosis (fragmentation) or lysis. The key factor in apoptotic pathway regulation is c-Jun-N-terminal kinase (JNK), stress kinase from the mitogene-activated protein kinase (MAPK) family. To investigate the effect of JNK inhibition on porcine oocytes ageing, cleavage rate, and embryonic development after parthenogenetic activation, DNA fragmentation, and pro-apoptotic factor Bax expression, we cultured in vitro matured oocytes for another 1-4 days in the presence of a JNK inhibitor. The inhibition of JNK significantly protected the oocytes from fragmentation (0% of fragmented oocytes under JNK inhibition vs. 13.4% of fragmented oocytes in the control group, 2nd day of ageing) and increased the percentage of parthenogenetically activated oocytes (82 vs 57.7%, 2nd day of ageing). The embryonic development of oocytes parthenogenetically activated after 24 h of ageing was influenced by JNK inhibition as well. The percentage of oocytes at the morula stage, after seven days of cultivation, was significantly increased when oocytes aged in the presence of a JNK inhibitor (42.5%) by comparison to the percentage of oocytes exposed to ageing in an inhibitor-free medium (23.3%). DNA fragmentation was significantly suppressed by JNK inhibition from the 1st day of ageing, but the expression of pro-apoptotic factor Bax in the oocytes was not influenced. On the basis of our experiments, we can conclude that JNK inhibition suppresses apoptosis and DNA fragmentation of aged oocytes and improves their embryonic development following the parthenogenetic activation. However, to completely eliminate all ageing related processes is insufficient.

Early performance of cv. Jonagold apple on M.9 in five tree training systems

Y. Ozkan, K. Yildiz, E. Küçüker, Ç. Çekiç, M. Özgen, Y. Akça

Hort. Sci. (Prague), 2012, 39(4):158-163 | DOI: 10.17221/35/2012-HORTSCI

The effects of five training systems on tree growth, fruit yield and some fruit characteristics were assessed in Jonagold apple cv. grafted on M.9 rootstock. The trees were trained in one of five ways: slender spindle (SS; 4,761 trees/ha), vertical axis (VA; 2,857 trees/ha), hytec (HT; 1,904 tree/ha) and two different tree densities of super spindle (L-Super S with 5,000 trees/ha; H-Super S with 10,000 trees/ha). Trunk cross-sectional area (TCA) was higher in HT and VA than SS, L-Super S and H-Super S in the 4th year. While HT had the highest cumulative yield/tree, the lowest cumulative yield was observed in H-Super S. Although HT had the highest yield/ tree, it ranked the last in cumulative yield efficiency (CYE) due to high TCA. The highest (CYE) was measured in trees trained as L-Super S. When cumulative yields (CY)/ha were evaluated, the yield advantage of high density planting was clearly evident for the first three cropping years. H-Super S systems (10,000 trees/ha) had the highest CY/ha and achieved a yield of 91.24 t/ha in year 4. HT (1,904 trees/ha) had the lowest CY/ha (33.46 t). Training systems had no consistent effect on average fruit diameter, weight, firmness, soluble solid and titratable acidity.

Aboveground biomass of substitute tree species stand with respect to thinning - European larch (Larix decidua Mill.)

J. Novák, M. Slodičák, D. Duąek

J. For. Sci., 2011, 57(1):8-15 | DOI: 10.17221/24/2010-JFS

This study is focused on substitute European larch stands in the Kruąné hory Mts. (northern part of the Czech Republic). Research was conducted within larch thinning experiment Kalek (780 m a.s.l. in the category Piceeto-Fagetum oligo-mesotrophicum - Calamagrostis villosa). Results showed that the aboveground biomass of the investigated substitute unthinned larch stand represented approximately 102 thousand kg of dry matter per ha at the age of 20 years. Stemwood (ca 59%) is the most important part of the aboveground biomass. Needles, live and dead branches accounted approximately for 6%, 17% and 11%, respectively, and stem bark only for 7%. At the age of20 years, the investigated substitute unthinned larch stand accumulated: nitrogen - 307 kg, phosphorus - 21 kg, potassium - 136 kg, calcium - 122 kg, magnesium - 53 kg per hectare. Thinning with consequent removal of aboveground biomass may result in nutrient losses. Especially, the removal of whole tree biomass by thinning for chipping in areas previously degraded by acid deposition may result in calcium and magnesium deficiency because of their low content in forest soil. On the other hand, thinning supported faster growth of trees left after thinning and consequently faster biomass and nutrient accumulation. Our results supported the recommendation that the use of biomass from thinning for chipping should be limited to stemwood only and the remaining aboveground biomass (mainly needles and branches) should be left in the forest ecosystem for decomposition in conditions of the historically disturbed area of the Kruąné hory Mts.

Animal welfare of barrows with different antemortem lairage times without foodOriginal Paper

P. Roldan-Santiago, D. Mota-Rojas, I. Guerrero-Legarreta, P. Mora-Medina, F. Borderas-Tordesillas, A.D. Alarcon-Rojo, S. Flores-Peinado, H. Orozco-Gregorio, R. Martinez-Rodriguez, M.E. Trujillo-Ortega

Vet Med - Czech, 2013, 58(6):305-311 | DOI: 10.17221/6866-VETMED

This study evaluated the effect of five different periods of antemortem lairage without food on the energy metabolism, gas exchange, mineral and blood acid-base balances of 1174 hybrid barrows, which were divided into six treatment groups according to the lairage period: 130 barrows were considered for the evaluation of the baseline levels (GB); 214 had 0 h of lairage (R0); 228 had 4 h of lairage (R4); 204 had 8 h of lairage (R8); 192 had 12 h of lairage (R12); and 206 had 24 h (R24). In all groups, increasing lairage periods triggered a significant reduction (P < 0.05) in pH, accumulation of lactic acid and percentage of hematocrit. These findings led to the conclusion that antemortem lairage periods longer than 4 h cause hyperglycaemia, hypercalcaemia, hyperlactataemia, hyperkalaemia, hyponatraemia, acidosis, and more severe dehydration in barrows.

Silicon content in beers from Korean market and estimation of its alimentary uptakeOriginal Paper

Je-Hyuk LEE, Kang Hun CHOI, Se Rom PARK, So A. SHIN, Soon Ah KANG, Ki-Hyo JANG

Czech J. Food Sci., 2013, 31(4):382-389 | DOI: 10.17221/369/2012-CJFS

Silicon content of Korean domestic beer was approximately 13.2 mg/l, which was 142% higher than 9.24 mg/l in imported beer. The contents of Ca and Mg were in the range of 31-33 mg/l and 39-41 mg/l, respectively, which were similar in Korean domestic and imported beers. Through beer ingestion, the men's average Si intake was approximately 24.3 mg/day, which was 195% higher than the women's average Si intake (12.4 mg/day). In addition, it was found that 20-29 aged men and women took approximately 33.7 and 25.1 mg/day of Si, respectively, which are higher Si intakes through beer ingestion as compared to other age ranges. As to people in other age-ranges, the women's Si intake through beer ingestion was half that of men's. Domestic beer-1 and beer-2 had 8.50 and 6.45 Si μg/won of Si content per unit price, respectively. Taken together with these results, it was estimated that the more expensive the price of beer, the lower the Si content per unit price. Therefore, it is supposed that the cheap Korean domestic beer is an effective supplier of Si, the beer being considered the major resource for Si intake by humans inKorea.

Assessing the impact of management practices on gas emissions and N losses calculated with denitrification-decomposition modelOriginal Paper

A. Syp, A. Faber, D. Pikuła

Plant Soil Environ., 2015, 61(10):433-437 | DOI: 10.17221/15/2015-PSE

The study presents the impact of management practices on greenhouse gas emissions (GHG) and nitrogen (N) losses calculated with a denitrification-decomposition model. Two cropping systems were analysed. The first rotation (A) consisted of potato, winter wheat, spring barley and corn. The second (B) included potato, winter wheat, spring barley and clover with grasses mixture. In A1 and B1 scenarios, fluxes were estimated on the basis of mineral fertilizers input, whereas in A2 and B2 scenarios the assessment of emissions was made with regards to manure. The results indicated that the application of manure in A rotation led to the increase of nitrous oxide (N2O) emission, N leaching, N surplus, crop yields, and the decrease of nitrogen use efficiency higher than in B rotation. Additional doses of manure in A2 scenario increased the potential of the accumulation of soil organic carbon (SOC) and global warming potential (GWP) by 157%. In B2 scenario, SOC augmented more than three-fold but GWP increased only by 10%. The N losses and GHG emissions could be minimised by controlling N application through the implementation of nutrient management plan in which N doses are defined based on the crop needs and soil quality.

Overcoming the legacy of the past? Analyzing the modes of governance used by the Polish agricultural producer groupsOriginal Paper

Volker BECKMANN, Ilona M. OTTO, Rong TAN

Agric. Econ. - Czech, 2015, 61(5):222-233 | DOI: 10.17221/190/2014-AGRICECON

The cooperative movement in Poland has a long but difficult history, which has caused farmers to have an aversion to cooperatives. Nonetheless, in the early 1990s, the first farmers' cooperative marketing organizations, which were called agricultural producer groups, appeared in the market. These groups are bottom-up, voluntary organizations the primary purpose of which is to jointly sell their members' output. In this paper, it is investigated why the new forms of governance, namely cooperative arrangements, were chosen, and we evaluate the implications of these choices on the market success of these groups. Empirical data were collected from 62 producer groups in one Polish province. We found that the groups were typically functioning as associations, unions, and limited liability companies. The factors that had an impact on the choices made were the number of members and the specific investment per member. Additionally, if the initial investment level was low, not only set-up and operational costs but also tax considerations played a role in the decision. Therefore, we argue that the new bottom-up cooperatives, which are theoretically suitable when the start-up capital is high or the number of members is large, will gradually be recognized and accepted in the market despite the fact that these cooperatives have a "bad reputation" caused by the socialist legacy. The new cooperative development trend confirms this argument.

Management of maize stand height using growth regulatorsOriginal Paper

Tomáą SPITZER, Petr MÍ©A, Jan BÍLOVSKÝ, Jan KAZDA

Plant Protect. Sci., 2015, 51(4):223-230 | DOI: 10.17221/105/2014-PPS

Effect in reducing maize plant height using growth regulators ethephon, chlormequat chloride (CCC), CCC + ethephon, and mepiquat chloride + prohexadione-Ca was studied in field experiments during 2010 and 2011. It was found that maize plant height could be reduced by as much as 125 cm (49% of control) using a double application of ethephon (576 g a.i./ha) at growth stages BBCH 18-19 and BBCH 34-36. The other growth regulators displayed weak or no influence. An optimum level of shortening was achieved using ethephon (576 g a.i./ha) at BBCH 34-36 (reducing plant height by 40-90 cm), but it is necessary to count upon yield loss of 0.5-0.6 t/ha.

Two different methods for screening of bile salt hydrolase activity in Lactobacillus strainsFood Microbiology and Safety

Pavla Sedláčková, ©árka Horáčková, Tiange Shi, Michaela Kosová, Milada Plocková

Czech J. Food Sci., 2015, 33(1):13-18 | DOI: 10.17221/299/2014-CJFS

Bile salt hydrolase (BSH) activity of intestinal bacteria (including lactobacilli) is one of the indirect ways of decreasing a cholesterol level in human body. Tested Lactobacillus strains were isolated from various sources (faeces of fully breast-fed infants, cow's colostrum, cow's raw milk cheeses, and cow's raw milk) and identified by genotypic and phenotypic methods. All strains, including three commercial probiotic strains and six culture collection strains, were subsequently tested for their BSH activity via two methods - thin layer chromatography (TLC) and plate assay. Among all the 59 Lactobacillus strains, 15 strains were shown to be BSH positive by TLC method and only 8 of them by plate assay. Most of the BSH positive strains (9 strains) were isolated from faeces. Differences between BSH activities for sodium salts of cholyltaurine and cholylglycine were demonstrated. The TLC method was shown to be more sensitive compared to the plate assay for BSH activity determination.

Evaluation of the morphologic method for the detection of animal and herbal content in minced meatFood Technology and Economy, Engineering and Physical Properties

Javad Sadeghinezhad, Bahador Hajimohammadi, Farkhondeh Izadi, Fatemeh Yarmahmoudi, Rocco Latorre

Czech J. Food Sci., 2015, 33(6):564-569 | DOI: 10.17221/167/2015-CJFS

The quantitative and qualitative accuracy of the routine histological method for the determination of unauthorised animal and herbal content in minced meat was to evaluated. Laboratory adulterated minced beef meat; each containing 5, 10, 15 and 20% of soya and chicken gizzard was prepared. Then each sample was divided into three parts and four paraffin embedded blocks were prepared from each part. The sections were stained using haematoxylin and eosin, toluidine blue and Masson's trichrome. The histological examination revealed the soya and gizzard tissues clearly in all the samples. The histometrical analysis showed that there was no significant difference between the estimated percentages of both additive tissues and the real related percentages. Overall, neither was there any significant difference between the data of the three parts of each sample and the real percentages. The findings of the present research suggest the histological technique as an effective method for qualitative and quantitative evaluations of minced meat.

Nitrogen leaching and residual effect of barley/field bean intercroppingOriginal Paper

M. Mariotti, A. Masoni, L. Ercoli, I. Arduini

Plant Soil Environ., 2015, 61(2):60-65 | DOI: 10.17221/832/2014-PSE

Cereal/legume intercropping may improve resource use efficiency in agroecosystems and increase yield per unit surface area and yield stability. Two field bean (Vicia faba L.) and four barley (Hordeum vulgare L.) cultivars were mono- and intercropped (additive design) in a 2-year lysimeter experiment on a sandy loam soil. The aim was to test the effect of the cropping system on dry matter and N yield of forage, the residual effect on the subsequent ryegrass crop (Lolium multiflorum Lam. westerwoldicum), and NO3-N leaching in the rotation. Land equivalent ratios were 1.65 for dry matter and 1.67 for N yield, indicating a clear advantage of the intercrop over sole crops. Both species suffered from competition, especially in terms of N resources, but barley was less affected. Nitrate leaching was the lowest from intercrop. Preceding crop significantly affected dry matter, N content and NO3-N leaching of ryegrass. Field bean sole crop gave the highest benefits to ryegrass in terms of forage dry matter and N content, but also the highest NO3-N leaching, followed by the intercrop and the barley sole crop. Barley/field bean intercropping may be an effective strategy to reduce land requirements, N leaching losses and fertilizer inputs, thereby increasing the sustainability of farming systems.

The effect of herbicides on the content of glycoalkaloids in the leaves and tubers of potatoOriginal Paper

K. Zarzecka, M. Gugała, A. Sikorska

Plant Soil Environ., 2015, 61(7):328-331 | DOI: 10.17221/314/2015-PSE

The aim of the studies was to determine the effect of the used herbicides and their mixtures on the level of glycoalkaloids (TGA) in the leaves and tubers of three edible potato cultivars. The studied factors were: I - three cultivars: Cekin, Satina and Tajfun. II - five ways of care: 1. mechanical care - the control object and four objects using herbicides Command 480 EC, Afalon Dispersion 450 SC and Stomp 400 SC. The content of glycoalkaloids both in the leaves and in the tubers of the edible potato significantly depended on the genotype. The highest content of TGA characterised the cv. Cekin - 623.5 mg/kg and 67.21 mg/kg of fresh weight (FW), respectively, while the smallest was found in cv. Satina - 339.3 mg/kg and 33.60 mg/kg of FW, respectively. Herbicides used in the experiment caused the increase of the content of glycoalkaloids compared to the tubers from the control object. However, a significantly higher concentration of TGA was stated after using the mixture of herbicides Command 480 EC + Afalon Dispersion 450 SC and Stomp 400 SC + Afalon Dispersion 450 SC.

Experimental research on phytomass suitable for production of biogasOriginal Paper

M. Pastorek, J. Kára, Z. Pastorek

Res. Agr. Eng., 2015, 61(3):129-133 | DOI: 10.17221/74/2013-RAE

The structure of the dry material plant is made up of a cell tissues system. The walls of the cells are formed by cellulose and lignin, ingredients difficult to biodegrade. Therefore, the aim of the breeders performed a variety of energy plants, providing a high yield of dry matter in the green state. This applies particularly to herbs, grown on agricultural and arable land (for example cereals, maize, sorghum, hemp, amaranthus, mallow, sugar beet, potatoes, fodder crops on arable land, permanent grassland and other). The subject of the experiment was to evaluate selected varieties of maize and sorghum and to determine the suitability of the materials on the device model for anaerobic fermentation mixed with beef slurry, and ferment from the biogas plant. Among the varieties of maize there are the significant differences in the production of biogas in the same conditions. Of the three maize varieties (Fixxif, Saxxo, Benicia), the most powerful was Saxxo.

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