Features of weight growth of repair heifers-daughters of different bulls-sires

The decrease in the duration of productive use, the deterioration of reproductive abilities have raised the issues of reproduction and rearing of young animals for herd repair to one of the leading places in the technological cycle of milk production. The purpose of the work is to study the features of weight growth of repair heifers - daughters of bull producers. Repair heifers-daughters of Thunderlight bull 928772375 repeated the growth characteristics of all repair heifers in the herd and differed from them in that they lagged slightly behind the average in live weight. The heifers obtained from the Seiner 4861 producer bull exceed the average repair heifers both on the farm and the minimum breed requirements in all periods of growth. Confirmation of the high intensity of growth is the achievement of the necessary live weight for the first insemination at 11.6 months, which is 1.4 months or 10.8% faster than the average for the herd. The indicators for age and live weight of the first insemination in heifers-daughters of the Bentley bull 924557855 and the average for the herd were unambiguous and did not differ. They are higher than the standard for the Holstein breed. In terms of live weight, significant differences were found with the requirements for the breed, in the direction of increasing it in heifers-daughters of the Bakero bull 920855469 by 41 kg or 11.2%, and the average values for the herd - by 35.5 kg, which is 9.7% relative to the requirements. The difference between the average herd and the daughters of the Bakero bull 920855469 was 5.5 kg or 1.4%, in favor of the daughters.