Some characteristics of Kholmogory cattle in the conditions of the Arkhangelsk region

Purpose: the study of the breeding and genetic aspects of the bull-producers of the Kholmogorsk breed in the conditions of the Arkhangelsk region, taking into account their bloodiness in improving breeds (Golsteinskaya).Materials and methods. Individual reproductive abilities of bull-free bulls with the productivity of their daughters in comparison with peers, dairy productivity of ancestors on the maternal line (M-mother, ⅰ-ⅴ lactation), the mother of the father, and the mother’s mother were studied. A scientific analysis of the recreation cows of the Kholmogorsk breed of the Arkhangelsk population was carried out in order to establish the potential of the breed for further selection.Results. It was established that for bulls' bulls of blood, 30-39%, the effectiveness of one insemination is 52-57%, from the first insemination the effectiveness from these bulls was 35-47%. The resulting offspring, depending on the individuality of the bulls, is from 33 to 53% of females. However, the average indicator is almost 50x50 (51%♂ and 49%♀). It was established that the higher the blood producers in the producers in an improvement breed, the higher the dairy productivity, for example, the daughter of purebred bull-fingers, had dairy productivity of 3311 kg of milk for lactation, and with blood cells 63%-5281 kg of milk for lactation.At all levels, these indicators were higher than that of peers. Analytical indicators were recorded in terms of productivity by 1% fat content of milk. It should be noted that the parents of the manufacturing bulls for mothers had productive periods of operation of more than five lactations with a maximum productivity of more than 11,700 kg of milk with a fat content of 3.85%. This shows the level of potential of mothers of these bullshit. On average for the mother, the productive indicators of these bulls-manufacturers amounted to 10,400 kg of milk per year for one lactation. The productivity of MM and MO on average amounted to 7720 and 7401 kg of milk for lactation, respectively.It was found that the dairy productivity of the recreation cows of the Kholmogorsk breed of the Arkhangelsk population in the conditions of the Arkhangelsk region, from 13 cows, on average amounted to 12852 kg of milk, with variability of 12340-14859 kg. This indicates the breeding potential of this population, in addition, it should be noted that the milk productivity of the Kholmogorsk breed of cows with each new lactation increases with respect to previous lactations, even the mothers of these bullshit after ⅴ lactation remains at the highest level. For example, in a cow named phytom for ⅳ lactation, milk yield amounted to 14859 kg of milk with a fat content of 3.99 % and a protein of 2.99 %. For comparison, it can be noted that on average, the economic use of the Holstein cows in total is 2.5-2.8 lactations.