Influence of the analytical crossing of the Ukrainian Black-White and Red-White dairy breed with the Montbeliard bulls on the growth of crossbred heifers

Abstract

The results of the research on the development of local heifers were obtained by evaluating the crosses of the Ukrainian Black-White and Red-White dairy heifers with Montbeliard bulls in the SE EF «Hontarivka» and SE EF «Kutuzivka», Kharkiv region. Heifers, which were obtained after crossing the Montbeliard breed with the Ukrainian Red-White dairy breed in the SE EF «Hontarivka», had higher live weight, comparing to the Red-White counterparts. Thus, at the age of 6 months, they weighed 8.8 kg more, at 9 months — 16.7 kg more, at 12 months — 27.1 kg more, at 15 months — 38.5 kg more and at the age of 18 months — 38 kg more (P> 0.95). The degree of influence of the parent breed factor on the live weight of heifers from 6 months of age was 2.33%, and the highest degree of influence was at 15 months of age 13.03%. And in SE EF «Kutuzivka», the strength of the male’s influence was slightly lower than in the massif of the Ukrainian Red-White dairy breed and did not exceed 4.8%. However, the impact was likely. It was found that in the period from 3 to 15 months of age the daughters of Montbeliard bulls in the SE EF «Hontarivka» prevailed over their peers in average daily gains by 94–174 g (13–21%), and in SE EF «Kutuzivka» by 27–112 g (3–12%), P> 0.999. It was revealed that the results of research obtained in the conditions of SE EF «Kutuzivka» were similar to those obtained in SE EF «Hontarivka». Already at the age of 3 months, heifers obtained from bulls of the Montbeliard breed exceeded their peers obtained from Holstein bulls by 1.8 kg, at 6 months by 9.5 kg, at 9 months by 13.1 kg, at 12 months by 16.1 kg, at 15 months by 21.8 kg and at 18 months of age by 20.8 kg, P> 0.95.