Czech Journal of Animal Science, 2004 (vol. 49), issue 2
Defective eggs and their relationship to egg yield, egg and body weight in hens of five original laying lines
L. Máchal, S. Jeřábek, M. Zatloukal, E. Straková
Czech J. Anim. Sci., 2004, 49(2):51-57 | DOI: 10.17221/4279-CJAS 
We investigated 3 985 individually housed hens of five original laying lines of two breeds RIR and BPR. The proportion of abnormal eggs out of the eggs laid before the age of 240 days ranged between 7.0% and 9.7%, in dependence on the line. The average number of cracked eggs ranged between 2.5% and 4.4%, double-yolk eggs between 2.2% and 3.0% and shell-less eggs between 2.0% and 2.7%. The correlation between the number of eggs laid at the beginning of the laying period and during the period of observation, and the frequency of double-yolk eggs was positive (rP = 0.00 to rP = 0.21) and mostly statistically highly...
The algorithm of Bayesian estimation of maternal genetic and permanent maternal environmental variances in a two-trait binary threshold model
E. Skotarczak, M. Szyd, A. Dobek, K. Moli, T. Szwaczkowski
Czech J. Anim. Sci., 2004, 49(2):58-63 | DOI: 10.17221/4280-CJAS
The paper presents an algorithm for the estimation and prediction of parameters in a two-trait binary threshold model. The model includes fixed effects and the following random effects: genetic direct additive, genetic maternal additive and permanent maternal environmental effects. The Gibbs sampling procedure was used to estimate the parameters. The algorithm was illustrated with a numerical example showing appropriateness of the proposed method.
Analysis of the formation of the belly in relation to sex
R. Stupka, M. ©prysl, M. Pour
Czech J. Anim. Sci., 2004, 49(2):64-70 | DOI: 10.17221/4281-CJAS
The aim of the study was to analyse the formation of pig belly in relation to sex. The analysis included in total 193 slaughter pigs of final hybrids currently used in the Czech Republic. The pigs were slaughtered at the age of 166-175 days. The VIA method according to the methodology of Schwerdtfeger et al. (1993) was used to evaluate the formation of belly and to estimate the percentage of lean meat. The calculation of the lean meat and its proportion in the belly was based on the equation according to Čítek (2002). The belly in total as well as the EU belly in barrows reached the weight of 7.85 kg and 4.35 kg, respectively, and in gilts...
Influence of dietary vitamin e and copper on fatty acid profile and cholesterol content of raw and cooked broiler meat
V. Skřivanová, M. Skřivan, E. Tůmová, S. ©evčíková
Czech J. Anim. Sci., 2004, 49(2):71-79 | DOI: 10.17221/4282-CJAS
We examined the influence of a diet containing 4% of rapeseed oil, 35 mg or 126 mg copper and supplement of 100 mg vitamin E per 1 kg on fatty acid profile and cholesterol content in raw and cooked broiler leg meat. Copper was added to feed mixtures as CuSO4.5H2O. The fatty acid profile and cholesterol content were also determined in raw, stewed and roasted meat of broilers receiving the same diet but with a supplement of 20 mg vitamin E. The results showed that 126 and 35 mg Cu/kg significantly increased oleic acid content. Monounsaturated fatty acids accounted for 51% and 52% of all fatty acids. The relatively low copper concentration...
The effect of a housing system in slaughter turkeys on mechanical damage to carcass and meat quality
A. Wójcik, J. Sowińska, K. Iwańczuk-Czernik, T. Mituniewicz
Czech J. Anim. Sci., 2004, 49(2):80-85 | DOI: 10.17221/4283-CJAS
The aim of the experiment was to find out whether the housing of Polish white broad-breasted heavy type turkeys J-22 on slatted floor (group I) and litter floor (group II) has an effect on the final body weight, body weight loss during transportation, mechanical damage to carcass and physical and chemical properties of breast meat. The turkeys were kept in controlled environment: turkey hens for 16 weeks (group I - 29 birds; group II - 30 birds) and turkey cocks for 23 weeks (group I - 21 birds; group II - 28 birds) in compliance with the parameters recommended for this species. The turkey cocks kept on the slatted floor made of metal mesh had lower...
Comparison of the performance and precocity of winners of the most important european classic races
I. Jiskrová, D. Misař, S. Svobodová
Czech J. Anim. Sci., 2004, 49(2):86-92 | DOI: 10.17221/4284-CJAS
Racing performance of winners of European classic races and of two-year-old horses was compared on the basis of two classic races: 1 600-1 609 m (one mile) and 2 100-2 414 m (derby). The horses included in our comparisons were winners of classic races held in England, France and Ireland in 1993-2002. The performance of the winners of classic races was based on the international classification of the performance of three-year-old horses (Classifications internationales) in kg and lb (rating) and used as the characteristics of performance. Comparisons of the correlations between the performance of winners of the most important classic races and their...