Abstract
The purpose of these studies was to assess the influence of Russian Black Pied cows’ body types on their productive longevity. The studies were conducted on the basis of enterprises of the Sverdlovsk region specializing in breeding of Russian Black Pied cattle. Most heifers were of the complex class “Excellent” (36.0%), less of “Satisfactory” (6.0%). The second largest class was “Good with a plus” (28.0%). A complex class of animals affects their milk production. When selecting first-calf heifers, taking into account the body type, it seems possible to obtain animals of a conformation complex class not lower than “Good”; to obtain at least 5000-5500 kg of good quality milk with a mass fraction of fat of 3.85-3.88% and protein fraction of 3.06-3.08% from cows of 305 days of lactation, depending on the potential of the breeding herd; to increase the duration of production use up to 4.3-6.8 lactations; to increase the level of lifelong yield to 29637.0-38126.8 kg of milk.
Highlights
In modern conditions of extensive use of industrial technologies, there is a need for breeding highly productive animals that are well adapted to intensive conditions of use [1-3]
The objective was to assess the influence of body type of Russian Black Pied cows on their productive longevity
When studying the influence of a linear assessment of the conformation on the milk yield, 4 groups of first-calf heifers were formed depending on the conformation complex class
Summary
In modern conditions of extensive use of industrial technologies, there is a need for breeding highly productive animals that are well adapted to intensive conditions of use [1-3]. When analyzing data on the evaluation of cows’ conformation, many authors came to the conclusion that the body type, as a factor, significantly affects the milk yield and it is one of the main breeding traits in the improvement of Russian Black Pied cattle [4-9]. Dense proportional composition, having a height at the withers of at least 130 cm, stretched, with widely set, strong limbs and well-developed dairy forms are distinguished by increased productive longevity [10-16]. All this indicates desirability, and the urgent need to assess cows’ body types in breeding enterprises, to study the relationship between the conformation and the milk yield, and duration of the productive use of animals.
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