Czech Journal of Animal Science, 2011 (vol. 56), issue 9

Genetic parameters of test-day somatic cell scores for the first three lactations of Polish Holstein-Friesian cattle

K. Rzewuska, J. Jamrozik, A. Żarnecki, T. Strabel

Czech J. Anim. Sci., 2011, 56(9):381-389 | DOI: 10.17221/1288-CJAS  

Genetic parameters for somatic cell score in the first three lactations of Polish Holstein-Friesian cattle were estimated. A multiple-lactation model was applied with random herd-test-day effect, fixed regressions for herd-year and age-season of calving, and random regressions for the additive genetic and permanent environmental effects. The large data set was used that included over one million test-day records and more than 58 000 cows. Estimates of covariance components and genetic parameters were obtained by Bayesian methods using the Gibbs sampler. Average daily heritabilities of somatic cell score (SCS) in the first three lactations were 0.11,...

Proteolytic and anti-proteolytic activity in the seminal plasma of Eurasian perch (Perca fluviatilis L.) during the spawning period

J. Król, R. Kowalski, K. Demska-Zakęś, P. Hliwa, J. Glogowski

Czech J. Anim. Sci., 2011, 56(9):390-397 | DOI: 10.17221/1291-CJAS  

The aim of this study was to describe possible changes in protease and anti-protease activity in the seminal plasma of European perch (Perca fluviatilis L.) during the spawning time. No significant difference in proteolytic activity was observed between the beginning and the late period of the spawning season in perch. Anti-protease activity significantly increased during the sampling time. Electrophoretic profiles of gelatinolytic activity in the seminal plasma of perch were characterized by four molecular forms, which depend on the presence of Ca²⁺ during incubation. We also found two forms of caseinolytic activity with low molecular...

High dietary concentrations of methionine reduce the selenium content, glutathione peroxidase activity and oxidative stability of chicken meat

M. Skřivan, M. Englmaierová, G. Dlouhá, I. Bubancová, V. Skřivanová

Czech J. Anim. Sci., 2011, 56(9):398-405 | DOI: 10.17221/1289-CJAS  

Three experiments (EXP) were conducted using two hundred seventy male chicks Ross 308 in each (90 cockerels per treatment; 3 replications, 30 chickens per pen) for 42, 38 and 35 days. The basal diets (treatment 1) for three EXPs contained the identical ingredients, and the concentration of selenium (Se), methionine (Met) and total sulphur amino acids (TSAA) in the control diet was 0.11 mg/kg, 5.65 g per kg and 9.25 g/kg, respectively. Chicks in dietary treatment 2 were fed a basal diet supplemented with 0.3 mg/kg of Se (EXP 1, 2 and 3) and in dietary treatment 3 they were fed a basal diet with the addition of 0.3 mg/kg of Se and 1 g/kg (EXP 1 and 2)...

Effects of phytase B on laying performance, eggshell quality and on phosphorus and calcium balance in laying hens fed phosphorus-deficient maize-soybean meal diets

K. Żyła, M. Mika, S. Świątkiewicz, J. Koreleski, J. Piironen

Czech J. Anim. Sci., 2011, 56(9):406-413 | DOI: 10.17221/1290-CJAS  

A study was conducted to evaluate the effects of dietary supplementation of phytase B (product of the Aspergillus niger phyB gene expressed in Trichoderma reesei) on feed intake, laying performance, eggshell quality, and on phosphorus and calcium balance in laying hens. Seventy-two, 40 weeks old Hy Line Brown hens were fed for 14 weeks the following four phosphorus-deficient (0.12% nonphytate phosphorus, NPP), maize-soybean meal-based diets: (1) calcium-deficient (2.8% Ca) control diet; (2) diet 1 + phytase B at the activity of 2.5 acid phosphatase units (AcPU/kg); (3) control diet (3.8% Ca); (4) diet 3 + phytase B at the...

Linear and linear-threshold model for genetic parameters for SEUROP carcass traits in Czech beef cattle

Z. Veselá, L. Vostrý, P. Šafus

Czech J. Anim. Sci., 2011, 56(9):414-426 | DOI: 10.17221/1292-CJAS  

The objective of this study was to estimate genetic parameters for the results of classifying of carcass traits by the SEUROP method in beef cattle in the Czech Republic using linear and linear-threshold models. Genetic parameters were calculated and evaluated in a set of 4276 animals of eleven beef breeds and crosses with dairy and dual-purpose breeds (Aberdeen Angus - 1376, Hereford - 994, Simmental - 651, Charolais - 524, Piemontese - 185, Galloway - 162, Blonde d'Aquitaine - 147, Limousine - 106, Highland - 53, Gasconne - 44, Belgian Blue - 34) in 2005-2008. Aberdeen Angus, Hereford, Charolais and beef Simmental were the most numerous breeds. Fixed...