Comparative evaluation of productive qualities and indicators of reproduction of different breeds of cattle in the farms of the Republic of Komi

Improvement of productive and exterior of the Kholmogory cattle is reduced to the absorptive crossing with the Holstein breed, which casts doubt on its continued existence. Despite the low milk productivity, Kholmogorskaya breed has a number of advantages over Holstein. This is a longer production use, which is important for the Northern regions. Therefore, the study of economic and useful features for breeding purposes and the preservation of the population of this livestock is a necessary scientific and practical task. According to the results of the conducted researches it was established that the hol mosorska the Kholmogory breed and Holstein its crosses in the whole range of respects superior to the Ayrshire cattle: they have 18.2 days shorter than the service period is 5.4% higher fertilization, 2.9% higher calf crop, 19.9 days shorter lately period, 0.04 higher coefficient of reproductive ability, in 7 months less than the age of first insemination and 170 days earlier first calving...