ASSESSMENT OF REPRODUCTIVE QUALITIES OF COWS DEPENDING ON ORIGIN

Abstract

At present, the assessment of reproductive qualities of cows depending on their origin is of great scientific and practical importance in cattle breeding. This is due to the fact that violation of reproductive functions of animals, firstly, reduces milk productivity of cows, secondly, reduces the period of economic use of animals, and, consequently, the profitability of production of the industry in general. Studies on assessment of reproductive qualities of cows depending on their origin were conducted in the breeding farm ZAO Konstantinovo (CJSC). At this farm an extensive work on mating cows of the Russian Black Pied breed with Holstein bulls is in progress. As a result there are cows of different intermediate genotypes in terms of blood and lineage affiliation in the herd. Therefore, the aim of our research was to investigate the reproductive ability of the cows in the herd depending on their origin. Groups of first-calf cows were formed according to the analogy method, taking into account lineage and bloodlines. As a result of the conducted researches it has been established that the lineage of cows influences reproductive ability, namely, age of the first insemination and the first calving, service-period, inter-calving period, the fertility index and reproductive ability coefficient. The best reproductive performance was found in the Reflection Sovereign 198998 and Montvic Chieftain 95679 lines.

Keywords

• line
• bloodlines
• age of the first insemination
• age of the first calving
• service-period
• inter-calving period
• fertility index
• reproductive ability coefficient