Productivity and reproductive traits of cows of Holstein breed of different origin

Abstract

Back in Soviet times, the Institute of nutrition of the Academy of medical Sciences of the USSR had recommended in scientifi cally based nutrition standards that milk and dairy products should be in the diet of the population at least 30 % of all nutrients consumed by each person per day. According to scientists and practitioners breeding work in dairy cattle breeding is aimed at improving existing and creating new highly productive breeds, types and lines, herds of animals, as well as their rational use for the production of milk and beef. A comparative assessment of milk productivity and reproductive traits of cows of Holstein breed of diff erent origin along lines during three lactations in the breeding farm “Barybino” – “Koalko-agro” in the Moscow region has been presented in the article. It has been found that the best result in milk yield for the 1st lactation was obtained from cows of Wes Back Ideal 10134115 line – 7897 kg, with fat content of 4,20 % and protein content of 3,20 % in milk . The milk yield of cows of other lines of Refl ection Sovereign 198998, Montwick Chieftain 95679 and Pabst Governor 882933 was 7787, 7607, 7879 kg of milk, respectively. In general, in all lines there is a pattern of increasing milk yield before the second lactation and some of its decrease by the third lactation. According to the length of the open days period after the fi rst and third calving, it has been found that the cows of line Montwick Chieftain 95679 had the longest open days period equal to 149 and 179 days.