Czech Journal of Animal Science, 2008 (vol. 53), issue 6

Genetic evaluation of daily gains of dual-purpose bulls using a random regression model

H. Krejčová, J. Přibyl, J. Přibylová, M. Štípková, N. Mielenz

Czech J. Anim. Sci., 2008, 53(6):227-237 | DOI: 10.17221/360-CJAS  

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...

The relation of GH1, GHR and DGAT1 polymorphisms with estimated breeding values for milk production traits of German Holstein sires

E. Hradecká, J. Čítek, L. Panicke, V. Řehout, L. Hanusová

Czech J. Anim. Sci., 2008, 53(6):238-246 | DOI: 10.17221/362-CJAS  

: 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 DGAT1^K was connected with higher milk fat yield, milk fat and milk protein content, while allele DGAT1^A increased milk yield and milk protein yield. The effect of DGAT1 genotype explained from 4.70% of variability of EBVs for fat...

Joint effects of CSN3 and LGB genes on milk quality and coagulation properties in Czech Fleckvieh

A. Matějíček, J. Matějíčková, M. Štípková, O. Hanuš, V. Genčurová, J. Kyseľová, E. Němcová, T. Kott, J. Šefrová, M. Krejčová, S. Melčová, I. Hölzelová, J. Bouška, J. Frelich

Czech J. Anim. Sci., 2008, 53(6):246-252 | DOI: 10.17221/363-CJAS  

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...

Study of wheat (Triticum aestivum L.) quality for feeding ruminants using in vitro and in vivo methods

J. Pozdíšek, K. Vaculová

Czech J. Anim. Sci., 2008, 53(6):253-264 | DOI: 10.17221/359-CJAS  

: 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,...

Effect of dietary selenium sources on growth performance, breast muscle selenium, glutathione peroxidase activity and oxidative stability in broilers

G. Dlouhá, S. Ševčíková, A. Dokoupilová, L. Zita, J. Heindl, M. Skřivan

Czech J. Anim. Sci., 2008, 53(6):265-269 | DOI: 10.17221/361-CJAS  

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...