Milk yield effect on the red an white cows productive and reproductive qualities

The aim of research is to study the effect of the milk yield on the reproductive qualities of red-and-white cows in herds of the Krasnoyarsk Region. Research objectives: assessment of the productive qualities of cows in the farms of the Krasnoyarsk Region; analysis of the reproductive quality of cows; study of the effect of milk yield on the reproductive qualities of cows. The cows of JSC Tubinsk were distinguished by a high mass fraction of protein - 3.10 %, in JSC Solgon - a high milk yield - 6896 kg, and in JSC Plemzavod Krasnoturansky - with a high fat content - 4.25 %. The animals of Solgon JSC had better reproductive qualities than cows from other farms. They had a service period of 122 days, an interbody period of 403 days, a high fertility rate of 0.94, and a calf yield of 92.7 %. It was found that with an increase in the milk yield in all farms, the service period and the interbody period increase. The dry period, regardless of the amount of milk yield, in all farms varied from 43.3 to 60.5 days. In all farms, with an increase in milk yield, a decrease in the coefficient of reproductive capacity of cows and the yield of calves is observed. In JSC Tubinsk and JSC Solgon in all groups, the fertility index was average - 44.0-50.5, in JSC Plemzavod Krasnoturansky it was good - 54.4-57.6. When breeding, it is necessary to take into account the amount of milk yield to improve the reproductive qualities of cows.