Factors affecting growth traits of beef cattle breeds raised in Slovakia
Krupa, E.(Vyskumny Ustav Zivocisnej Vyroby, Nitra (Slovak Republic))E-mail:krupa@vuzv.sk | Oravcova, M. | Polak, P. | Huba, J. | Krupova, Z.
Growth traits of purebred calves of six beef breeds (Aberdeen Angus, Blonde d'Aquitaine, Charolais, Hereford, Limousine, Beef Simmental) were analysed. General linear model with class effects of breed, dam's age at calving, sex, herd-year-season (HYS), and covariation of age at weighing was used for analyses. All effects significantly affected both weight and most of the gain traits. Simmental calves had the highest weaning weight and average weight gains. The growth of males was better than that of females. The best values in most of the parameters studied were recorded in calves descending from 5-7 years old dams. The proportion of variability of growth traits explained by HYS effect (42.96-71.69%) was high, whereas proportions of variability explained by sex effect (2.03-5.77%), age of dam (1.02-2.24%), and breed (1.05-2.21%) were low. Residuals accounted for 23.71 up to 53.79% of total variance.
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