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The revealed gynecological pathologies in Holstein cows can occur under the influence of different allelic systems and have a polygenic character. As a result of the research, a link between the reproductive traits and adaptability was established, which were characterized by low heritability and were subject to inbreeding depression. Selection rates increased from generation to generation by an average of 13.8 %, but did not always lead to changes in disease rates. The correlation coefficient between the milk yield of cows for 305 days of first lactation and the service period was – 0.227±0.013 (F test 5.2), the coefficient of linear regression of the service period for milk yield for 305 days of first lactation – 0.45±0.033. A positive correlation (r =+52±0.012) was found between the milk yield of full-aged cows for 305 days of lactation and the number of cows eliminated due to infertility (r = +52±0.012 Genetic and environmental factors together exceeded the threshold of adaptability, so the body's ability to resist became weakened. Correlation coefficient of daughter-mother on duration of diseases +0.33±0.022, on age of animals at the beginning of disease – +0.36±0.021. The recurrence rates of gynecological pathologies in cows from the first to the second lactation are + 0.807, from the second to the third – + 0.892, from the first to the third – + 0.454. From the data obtained, it follows that heritability depends on factors, each of which has a relatively small impact on variability and is determined by many genes. Signs with a threshold deviation are not associated with the efficiency of breeding productivity. Gynecological pathologies in offspring arise under the influence of different allelic systems. Keywords—reproductive diseases in cattle, heritability, resistance, susceptibility, frequency of exposure.

Additive-Polygenic Inheritance of Reproductive System Diseases in Holstein Cows in Subpopulations