Efficiency of the use of holstanish producers in the breeding of the Tajikian black mottle breed

Abstract

The article provides materials on the effective use of bulls of the Holstein breed in the breeding of the Tajik Black-and-White breed in the conditions of the Republic of Tajikistan. Both in the farms of the Northern part and in the farms of the Central part, when crossed with Holstein bulls, the genetic trend in milk yield and amount of milk fat was correspondingly high. In the offspring of the Tajik type of black-and-white breed on the farms of the Northern part, the average annual genetic improvement in milk yield was +49.6 kg of milk, and on the farms of the Central part, it was +68.6 kg of milk. Milk fat, respectively, amounted to 142, 1 and 181.5 kg. The influence of sires on daughters in the farms of the Central part in comparison with the farms of the Northern part is 1006 kg. This confirms that highly productive breeding plants are located in the territory of farms in the central part of the republic.