Methods of improving the productive qualities of livestock pale-mottled and black‑mottled breeds

Abstract

The article presents the results of individual linear selection in the Sychevskaya and Blackand- White breeds based on the use of domestic breeding lines (in the Sychevskaya breed) and lines of the Holstein breed in the Sychevskaya and Black-and-White breeds, carried out under the conditions of the Smolensk region. The study used materials from the breeding records of farms in the Smolensk region. The object of the study were cows descendants of the line breeding of the Sychevskaya and Black-and-White breeds of different genealogical affiliation. Lines of bulls of domestic selection in the Sychevskaya breed: Albert 4191, Anis 4593, Vakhter 4333, Danzig 3641, Clover 68, Levant 5091 Ratmir 2003, Toreodora 3032; in Holstein fawn and black-and-white color Vis Beck Idial 1013415, MontvikChiftein 95679, ReflectionSovering 198998, SilingTraijun- Rokit 252803, Governor Of. Kornation 629472, PabstGoverner 882933. The selection efficiency is reflected by a significant excess of the level of milk productivity in terms of milk yield, milk fat and protein content. Cows obtained from Holstein lines in the Black-and-White breed, compared with cows obtained from domestic lines, in the Sychevskaya breed significantly exceed the indicators of milk productivity. The study also showed an excess of productive qualities in cows of the Sychev breed of imported lines.