Analysis of the repeatability levels in estimating the productive capacity of cows

The conducted studies show the possibility of increasing the efficiency of breeding work with dairy cattle in the practice of livestock breeders based on the assessment of the level of repeatability of breeding characteristics. For animals bred in the conditions of breeding and commodity enterprises of the Omsk region, the coefficient of repeatability of milk productivity indicators is calculated depending on the breed, the content of milk fat and protein, the complex class of cows and the age group. The analysis of the repeatability of signs indicates a high level of their constancy. The studies have shown that the values of the repeatability coefficient for milk yield for 305 days of lactation are within 0.66...0.86, for milk fat content they are within 0.81...0.94, for the milk protein content - 0.84...0.91, for the milk yield of elite cows - 0.66...0.81, for the milk yield of cows corresponding to the elite record class - 0.74...0.86, depending on the age of animals, the milk yield repeatability index is in the range of 0.6-0.9.