Reproductive features of cows of different genotypes

Abstract

The main direction of increasing the production of livestock products is the rational use of the genetic potential of farm animals of domestic and imported breeds. Studies to assess the reproductive qualities of cows, depending on their origin to different genotypes, were conducted on the farm of the SEC Shiryaeva G.I. "Krasavsky", In this farm there is extensive work on mating cows of the Simmental breed with the red-mottled Holstein. As a result, there are cows of various genotypes in the herd by blood. Therefore, the purpose of our research was to study the reproductive abilities of herd cows depending on their origin. Groups of first-calf cows were formed by the method of analogues, taking into account belonging to genotypes. As a result of the conducted research, it was found that the belonging of cows to different genotypes affects reproductive abilities, namely, the age of the first calving, the service period, the interbody period, the fertility index and the coefficient of reproductive ability. Crossbred cows had a difference in age of 1 calving for 2.3 months. the interbody period was 0.9 months. compared with purebred Simmental cows, the service period is increased in both groups, but the smallest in Simmental cows is 84.9 days, in terms of milk productivity for 305 days of lactation, the superiority in crossbred cows is 494 liters of milk.