Template-Type: ReDIF-Article 1.0 Author-Name: H. Krejčová Author-Workplace-Name: Institute of Animal Science, Prague-Uhříněves, Czech Republic Author-Name: J. Přibyl Author-Workplace-Name: Institute of Animal Science, Prague-Uhříněves, Czech Republic Author-Name: J. Přibylová Author-Workplace-Name: Institute of Animal Science, Prague-Uhříněves, Czech Republic Author-Name: M. Štípková Author-Workplace-Name: Institute of Animal Science, Prague-Uhříněves, Czech Republic Author-Name: N. Mielenz Author-Workplace-Name: University of Halle-Wittenberg, Germany Title: Genetic evaluation of daily gains of dual-purpose bulls using a random regression model Abstract: Daily gains of 8 243 dual-purpose bulls from 100 to 400 days of age during the years 1971 to 2007 were analyzed by random regression models. Orthogonal Legendre polynomials (LP) of degree 4 were applied to daily gains calculated at 30-day intervals over the test period. Fixed curves were estimated within the station-year-season of birth. The models also included a fixed station-year-season of weighing, animal additive genetic effects and animal permanent environmental effects. The peak daily gain was attained between 230 and 280 days of age, which corresponded to the period of the lowest variance in daily gains. Heritability estimates of daily gain were in the range of 0.014 to 0.043. The reliability of composite trait - cumulative gains over the entire period was 0.87. Genetic correlations between gains at different ages were high for adjacent ages and decreased with increasing difference in ages. Correlations of permanent environmental effects were high for adjacent ages, but became negative for ages that were far apart, indicating the possibility of compensatory growth. The phenotypic correlations were close to zero. The correlations for cumulative daily gains were higher than those for individual daily gains. Keywords: daily gains, curve, random regression, heritability, correlation, bulls Journal: Czech Journal of Animal Science Pages: 227-237 Volume: 53 Issue: 6 Year: 2008 DOI: 10.17221/360-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/360-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-200806-0001.txt Handle: RePEc:caa:jnlcjs:v:53:y:2008:i:6:id:360-CJAS Template-Type: ReDIF-Article 1.0 Author-Name: E. Hradecká Author-Workplace-Name: Agricultural Faculty, South Bohemian University in České Budějovice, Czech Republic Author-Name: J. Čítek Author-Workplace-Name: Agricultural Faculty, South Bohemian University in České Budějovice, Czech Republic Author-Name: L. Panicke Author-Workplace-Name: FBN Dummerstorf, Germany Author-Name: V. Řehout Author-Workplace-Name: Agricultural Faculty, South Bohemian University in České Budějovice, Czech Republic Author-Name: L. Hanusová Author-Workplace-Name: Agricultural Faculty, South Bohemian University in České Budějovice, Czech Republic Title: The relation of GH1, GHR and DGAT1 polymorphisms with estimated breeding values for milk production traits of German Holstein sires Abstract: : We analysed the relations of estimated breeding values (EBV) of 315 German Holstein sires to their genotypes in growth hormone gene (GH1), growth hormone receptor gene (GHR) and acylCoA-diacylglycerol acyltransferase 1 (DGAT1). The strong relation of DGAT1 K232A to the estimated breeding values for milk production traits has been confirmed, when allele DGAT1K was connected with higher milk fat yield, milk fat and milk protein content, while allele DGAT1A increased milk yield and milk protein yield. The effect of DGAT1 genotype explained from 4.70% of variability of EBVs for fat yield to 31.90% of variability of EBVs for fat content. The evaluation of GH1 127 Leu/Val and GHR 257 SNP polymorphisms did not reveal an association of their polymorphism with EBVs for milk production traits, except the EBVs of GHRG/GHRG homozygotes for fat yield, which were significantly lower. The effect of GH1 or GHR genotype explained only a negligible portion of variability of EBVs (R2 < 1.00% in most cases). Keywords: bovine, GH1, GHR, DGAT1, milk production, breeding value, Holstein Journal: Czech Journal of Animal Science Pages: 238-246 Volume: 53 Issue: 6 Year: 2008 DOI: 10.17221/362-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/362-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-200806-0002.txt Handle: RePEc:caa:jnlcjs:v:53:y:2008:i:6:id:362-CJAS Template-Type: ReDIF-Article 1.0 Author-Name: A. Matějíček Author-Workplace-Name: Institute of Animal Science, Prague-Uhříněves, Czech Republic Author-Name: J. Matějíčková Author-Workplace-Name: Institute of Animal Science, Prague-Uhříněves, Czech Republic Author-Name: M. Štípková Author-Workplace-Name: Institute of Animal Science, Prague-Uhříněves, Czech Republic Author-Name: O. Hanuš Author-Workplace-Name: Research Institute for Cattle Breeding, Rapotín, Czech Republic Author-Name: V. Genčurová Author-Workplace-Name: Research Institute for Cattle Breeding, Rapotín, Czech Republic Author-Name: J. Kyseľová Author-Workplace-Name: Institute of Animal Science, Prague-Uhříněves, Czech Republic Author-Name: E. Němcová Author-Workplace-Name: Institute of Animal Science, Prague-Uhříněves, Czech Republic Author-Name: T. Kott Author-Workplace-Name: Institute of Animal Science, Prague-Uhříněves, Czech Republic Author-Name: J. Šefrová Author-Workplace-Name: Institute of Animal Science, Prague-Uhříněves, Czech Republic Author-Name: M. Krejčová Author-Workplace-Name: Institute of Animal Science, Prague-Uhříněves, Czech Republic Author-Name: S. Melčová Author-Workplace-Name: Institute of Animal Science, Prague-Uhříněves, Czech Republic Author-Name: I. Hölzelová Author-Workplace-Name: Institute of Animal Science, Prague-Uhříněves, Czech Republic Author-Name: J. Bouška Author-Workplace-Name: Institute of Animal Science, Prague-Uhříněves, Czech Republic Author-Name: J. Frelich Author-Workplace-Name: University of South Bohemia, České Budějovice, Czech Republic Title: Joint effects of CSN3 and LGB genes on milk quality and coagulation properties in Czech Fleckvieh Abstract: The aim of this study was to determine the joint effects of CSN3 and LGB genotypes on parameters of production, quality and coagulation of milk in Czech Fleckvieh cows. Three hundred and twenty-eight Czech Fleckvieh cows were determined for CSN3 (kappa-casein) and LGB (beta-lactoglobulin) genotypes using the PCR-RFLP method, milk quality parameters and coagulation properties. Milk production parameters were obtained from the Official Database of Progeny Testing. Fifteen genotype combinations were detected, with ABAB (21.0%) and AAAB (18.3%) occurring as the most frequent. The observed genes significantly affected the contents of milk protein (crude protein, true protein, casein and whey protein) as well as solid non-fat in milk, casein number and curd quality. BBAA was found to be the genotype with the highest positive impact on most of the milk characteristics evaluated. Whereas ABBB, BBBB, BBAB and ABAB had a positive influence on milk quality and milk coagulation properties, genotypes containing CSN3 allele E had a negative effect. Results presented in this study are applicable in the selection of Czech Fleckvieh cattle. Keywords: cattle, milk protein genes, kappa-casein, beta-lactoglobulin, milk production parameters, coagulation properties Journal: Czech Journal of Animal Science Pages: 246-252 Volume: 53 Issue: 6 Year: 2008 DOI: 10.17221/363-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/363-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-200806-0003.txt Handle: RePEc:caa:jnlcjs:v:53:y:2008:i:6:id:363-CJAS Template-Type: ReDIF-Article 1.0 Author-Name: J. Pozdíšek Author-Workplace-Name: Research Institute for Cattle Breeding, Ltd., Rapotín, Vikýřovice, Czech Republic Author-Name: K. Vaculová Author-Workplace-Name: Agrotest Fyto, Ltd., Kroměříž, Czech Republic Title: Study of wheat (Triticum aestivum L.) quality for feeding ruminants using in vitro and in vivo methods Abstract: : Nutrient digestibility and parameters of nutritive value for ruminants of two winter wheat (Triticum aestivum L.) cultivars were evaluated by means of an in vivo balance trial performed by the regression method on two groups of heifers with an increasing proportion of grain in DM (from 6 to 46%). Sulamit and Rapsodia, chosen on the basis of the in vitro test from a set of 25 cultivars (grown in 2002-2004) reached significant differences in DM fermentability in vitro (by 43.7-78.6 ml/g DM, P < 0.05). In vivo digestibility of crude protein, nitrogen-free extract, organic matter, parameters of N retention, energy concentrations (metabolisable energy, net energy for lactation and for fattening) and parameters in the PDI system (especially PDIE) increased along with the grain proportion in the diet. At the comparable proportion of grain in the ration the positive differences were significantly higher (P < 0.05) for Sulamit than Rapsodia. Keywords: balance trial, nutrient digestibility, nutritive value of grain, in vitro degradation and fermentation Journal: Czech Journal of Animal Science Pages: 253-264 Volume: 53 Issue: 6 Year: 2008 DOI: 10.17221/359-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/359-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-200806-0004.txt Handle: RePEc:caa:jnlcjs:v:53:y:2008:i:6:id:359-CJAS Template-Type: ReDIF-Article 1.0 Author-Name: G. Dlouhá Author-Workplace-Name: Institute of Animal Science, Prague-Uhříněves, Czech Republic Author-Name: S. Ševčíková Author-Workplace-Name: Institute of Animal Science, Prague-Uhříněves, Czech Republic Author-Name: A. Dokoupilová Author-Workplace-Name: Institute of Animal Science, Prague-Uhříněves, Czech Republic Author-Name: L. Zita Author-Workplace-Name: Czech University of Agriculture, Prague, Czech Republic Author-Name: J. Heindl Author-Workplace-Name: Institute of Animal Science, Prague-Uhříněves, Czech Republic Author-Name: M. Skřivan Author-Workplace-Name: Institute of Animal Science, Prague-Uhříněves, Czech Republic Title: Effect of dietary selenium sources on growth performance, breast muscle selenium, glutathione peroxidase activity and oxidative stability in broilers Abstract: This study examined the effects of supplementation of dietary sodium selenite and sodium enriched alga Chlorella on growth performance, selenium concentration in breast meat and excreta, activity of glutathione peroxidase in meat, and oxidative stability of meat in broilers. Sexed broiler cockerels Ross 308 were allotted to 3 dietary treatments, each comprising 100 chickens. The basal diet was supplemented with 0 (control) or 0.3 mg/kg Se from sodium selenite (SS) or Se-Chlorella (SCH). Dietary supplementation with SCH increased (P < 0.05) body weight. The breast muscle Se concentration was increased (P < 0.05) by SCH (0.70 mg/kg DM; 0.36 mg/kg DM in control) supplementation, but not (P > 0.05) by SS (0.49 mg/kg DM) supplementation. The concentration of Se in excreta was highest in the SS group. The activity of GSH-Px in breast meat was significant P < 0.05) in all treatments (0.16 U/g in control, 0.30 U/g in SS and 0.23 U/g in SCH group). The inclusion of SCH in the diet enhanced the oxidative stability of meat expressed as reduced malondialdehyde (MDA) values in breast meat after 0; 3 and 5 days storage in refrigerator at 3 to 5°C. Keywords: broilers, selenium, alga Chlorella, glutathione peroxidase, lipid oxidation Journal: Czech Journal of Animal Science Pages: 265-269 Volume: 53 Issue: 6 Year: 2008 DOI: 10.17221/361-CJAS File-URL: http://cjas.agriculturejournals.cz/doi/10.17221/361-CJAS.html File-Format: text/html X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/cjs-200806-0005.txt Handle: RePEc:caa:jnlcjs:v:53:y:2008:i:6:id:361-CJAS