DYNAMICS OF HEIFERS LIVING WEIGHT OF DIFFERENT BREEDS AND ITS FORECASTING IN SOME AGE PERIODS OF ONTOGENESIS
The dynamics of growth of live weight and its prediction in different age periods of ontogenesis in heifers of Simmental, Ukrainian Black–Spotted dairy and Ireshire.
It was set up living weight growth and average daily and relative increments of 18– to 30–month age were characterized by Simmental heifers. They dominated the representatives of Ukrainian Black–Spotted dairy and Ireshire by live weight at 5,3–8,1 % and 11,7–18,1 %, at the average daily increments to 2,4–33,6 % and 28,7– and 55,8 % for the relative increments to 5,9–25,0 % and 13,8–34,4 %.
Simmental heifers were more as the highest genetic potential of live weight growth, average rank for the entire period was 58,4±1,39 %, the same age as Ukrainian Black–Spotted dairy cattle were somewhat lower rank figure – 53,2±1,45 % and lowest rank was in Ireshire – 47,1±1,42 %.
Animals of Simmental breed according the realization their of genetic potential, will reach at adulthood live weight of 658 kg, and their Ukrainian Black–Spotted dairy breeds of the same age and Ireshire, respectively – 617 and 568 kg.
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