A.S. Durov, N.G. Gamarnik
SibNIIZh, Russia, Novosibirsk region, Krasnoobsk
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Summary. The has been doing estimation of the population of cows of black and white breed exterior ethyl and productive features in the formation of producer groups. The allocated in breeding and production groups in the degree of body weight, milk yield for 305 days of lactation, milk fat. Group I (breeding); Group II (production); Group III (rejection). Where K is the value of being ranked trait in animals – the average value of the characteristic in the population, the standard deviation. Were calculated by the following selection parameters: on live weight and breeding group K ≥ 527 kg, production 527 > K ≥ 472 kg, marriage K < 472, on milk yield 305 days of lactation breeding group K ≥ 4831 kg, production 4831 > K ≥ 3398 kg marriage K < 3398 kg, milk fat, breeding group K ≥ 178 kg, production 178 > K ≥ 128 kg marriage to < 128 kg. Comparative evaluation of herd shows that animal breeding group on body weight by 98.6% meet the breed standard for live weight, 103.8% for milk yield, 105.1% for the production of milk fat. Score grouping animals milk yield shows that cow breeding group exceed the breed standard for milk yield by 25.2%, milk fat by 24.6%, on live weight inferior to the requirements of -9.2%. It should be noted that animals breeding group on milk fat exceed the breed standard of 24.6%, according milk yield 24.1%; on live weight reached 90.6% of the requirements of the breed standard. To improve milk production of animals black and white breed must create a population of breeding cows having parameters and production of milk yield by selecting cows and selection of the respective manufacturers. Breeding group of cows on live weight, the presence of low milk yield, can be used to form herds and meat used as industrial crossbreeding with beef breeds, and as a parent basis for absorption.
Keywords: black and white breed, breeding and production group, milk yield for 305 days of lactation, milk fat.