Economic and productive qualities of aishire and black and-white cattle

The report presents the results of a study comparing the economically relevant characteristics of cattle from the Ayrshire and domestic black-and-white breeds bred in the Vologda region. It has been determined that cows from the domestic black-and-white breed have an advantage over animals from the imported Ayrshire in terms of milk production during the first and third lactations. In contrast the mass fraction of fat in the milk is higher for Ayrshire animals, with a difference of 0.5% for the studied lactations. The total indicator of milk fat yield per lactation, which is expressed in kilograms, also favors Ayrshires by 7 kg. Regarding another important economic indicator, the milk content ratio, Ayrshire cows yield a higher value of 39 kg compared to black-and-whites. When using Ayrshire cows for milk production, milking rates are significantly greater. Their milk production for the third lactation has increased by 1.2 times relative to black-and-whites, in relation to the first lactation. The linear relationship between the amount of milk fat and the breed has been established in the study.