THE RESULTS OF EVALUATION OF THE NEWLY CREATED LINES OF KAZAKH WHITE-HEADED CATTLE
The aim of the research was to study the growth and development of calves of different lines in a comparative aspect. The study was carried out on the APS (collective farm) «Anikhovsky», Orenburg region. The growth and development of heifers - the progeny of Zolotoy-3423 and Zorky-3433к sires, as well as heifers of the same age of other lines up to 15 months age, were studied. The research conducted showed the prospects of the above lines breeding, the offspring of which surpassed the basic lines, bred in the household over the period from 8 to 15 months age, by their growth intensity at 18.6-20.3% (P≤0.001). The 15 months-old heifers, the daughters of Zolotoy- 3423 and Zorky-3433k bulls, overweighed the breed standard in live weight by 6.9 and 7.5%, respectively, with complex assessment of 75-80 points or higher, which corresponds to elite and elite record grades. The indices of the animals' body points confirmed the opinion on the superiority of heifers of the lines, being created, in the main body measurements as well. The results of the conducted experiments, along with typification of the related groups of Zolotoy-3423k and Zorky-3433k and introduction of modern breeding methods of artificial insemination, make it possible to draw the conclusion on the expediency of using the offspring of the Zolotoy-3423k and Zorky-3433 bulls for improving the herd of the animal breeding farm and to carry out selection works for obtaining new lines of cattle breeds.