Genetic factor affecting the milk production of mares

Abstract

The article presents the results of studies to establish the influence of the record productivity of mothers’ mares on milk yield and the duration of productive life of mares-daughters of the Lithuanian heavy draft breed. It was found that the high level of milk productivity of mothers during the period of highest lactation (up to 4000 kg of milk) enabled their daughters to become leaders already during the first lactation. With an increase in the record milk yields per lactation in mothers, the heritability coefficient in mother-daughter pairs decreased and turned into negative values. The daughters of mares with record milk yields of up to 8000 are the most dairy among their contemporaries. The research results indicate that intensive milk production of mares during the first lactation can cause a reduction in the terms of their economic use due to the large loads on the developing fragile animal organism. The highest rates of productive life, number of lactations and life-long milk yield were obtained from daughters whose mothers had record milk yields per lactation from 7000 kg to 8000 kg of milk.

Связь Экстерьера Кобыл Русской Тяжеловозной Породы С Их Молочной Продуктивностью

“…Scientists of the Mari State University have been engaged in breeding horses of a number of heavyduty breeds for dairy productivity for more than forty years. It has been proved that intensive milking of mares increases their milk productivity and makes it possible to fully utilize the genetic potential of animals Chirgin E.D., Semenov V.G., Mokretsova A.S. et al (2021) [5].The association of milk productivity with the types of higher nervous activity and udder capacity of mares was revealed Chirgin E.D., Semenov V.G., Ivanova E.N. (2021) [6].…”