Reproducing the qualities of cows with different methods of synchronization of sexual hunting

Abstract

Increasing the intensification of herd reproduction is one of the main ways of increasing the number of beef cattle, increasing beef production, and reducing its cost. The main task in the reproduction of the herd is the annual receipt of a viable calf from each cow and heifer. One of the methods to increase reproductive functions is the use of hormonal drugs, analogues of sex hormones. Synthetic hormonal preparations in dairy cattle breeding are used to synchronize sexual hunting, ovulation and calving, to intensify the sexual functions of uterus (inducing superovulation, shorten the service period, etc.) and to treat pathologies of the ovaries, endometritis, and other disorders of the sexual apparatus of cows and heifers. The article presents the results of applying two synchronization schemes of sexual hunting in Holstein cows in an industrial dairy farm. In the first group, the Pre-synch scheme was used, in the second – «Ovsynch». The schemes differed in that the «Pre-synch» is longer and more costly, but it begins to be used from 21 days after calving. According to the results of the synchronization of sexual hunting of both groups, results were obtained on milk productivity. In the first group, baseline fat milk was produced for 305 days of lactation, 9411.0 kg of milk, in the second - 7785.0 kg. Considering all the costs of synchronizing sexual hunting in Holstein cows, profitability in the control group was 24.8%, in the experimental group - 19.2%.