The relationship physiology signs with productive longevity of cows of black- motley breed at various ways of content

The information on the influence of reproductive qualities on the moth-productivity and productive longevity of cows of black and motley breeds is presented with different methods of maintenance. Analyzed indicators, characterizing the age of animals, reproductive qualities and indicators that characterize productive qualities. The effectiveness of wet cattle breeding largely depends on the intensity of use of the breeding stock and especially high-yielding cows. When studying the age factor of the first calving in the context of technology, the following regularity was revealed: cows during the period of 28-29 months have the greatest period of economic use, both in the tethered mode of keeping and in the case of an unattached method. The productivity of cows that have gone for the first time in later periods is on a decline. Service-period is an important physiological period of time, allowing to recover to the animal until the next fruitful insemination. During the study, the influence of this paratypic factor revealed that in cows with the highest productive longevity with tethered technology 4.66 lactations and lifetime milk yield of 24348.9 the service period was 60-80 days. With a free-lace method of content, the maximum number of lactations of 4.65 and lifelong milk yield in the amount of 22076.4 was for a period of 100-120 days. Comparison of the average data in terms of technology at the leading tribal enterprises of the Udmurt Republic revealed that when the cows were kept unobtrusive, the duration of economic use amounted to 3.91 lactation, which is more than in the tethered method of containing 0.17 lactations. According to the results of lifelong milk yield, the advantage in favor of a non-cohesive method of maintenance was 318.3 kg.