НОВЫЙ МЕТОД ОЦЕНКИ ВОСПРОИЗВОДИТЕЛЬНЫХ КАЧЕСТВ БЫКОВ МОЛОЧНЫХ И МЯСНЫХ ПОРОД

Abstract

Artificial insemination in cattle farming is the advanced method to improve breeding and economic qualities in different cattle breeds. The key point in the procedure is the quality of semen production which is used in the breeding stock insemination. Analysis of a long-range and large scope data on semen production and its assessment resulted in development of a rating scale for assessment of milk-producing breed bulls: Red Steppe, Angler, Black and White, Ayrshire, Holstein-Friesian, as well as meat producing ones - Hereford and Aberdeen-Angus. The bull rating scale includes the following basic factors to be assessed at every artificial insemination station: intensity of sexual reflex, number of ejaculations, medium volume of an ejaculate, amount of semen, semen concentration and activity. New method of reproductive quality assessment in bulls of milk and meat breeds takes into consideration their origin, body type, exterior, progeny quality assessment, as well as data on intensity of sexual reflexes, semen volume and quality, thus allowing assignment each animal to a certain class based upon a set of characteristics obtained through objective evidence determined by hereditary features in both young and mature producing bulls. This approach allows increasing reproduction effectiveness, milk and beef production in both breeding and commercial farms by 20 to 30%.