Владимир Семенович Авдеенко Increasing requirements for systemic and predicted procreation predetermine the need for deeper and more comprehensive research in the field of cattle breeding. The task of evaluating the producers by their off springs is to identify the bulls, the most valuable in breeding, capable of mating with specially selected females to give offspring of the desired quality. Studies have established the effect of the origin of daughters from specific bulls on fertility decline. Analysis of the insemination results of cows and heifers with sperm from bulls of the line VB Ideal indicates that the reproductive potential of these bulls is mediocre and requires further research on microsatellite loci of the genome based on the polymerase chain reaction method. The line of bulls V. Ideal 0933122 when using sperm on farms requires a more thorough study and genotyping of the microsatellite loci of the genome to identify infertility or a predisposition to mastitis. Thus, the identification of producer bulls whose daughter has a decreased percentage of fruitful insemination and an increased incidence of mastitis should be included in the set of measures when selecting parental pairs in order to obtain offsprings without loss in productive and functional qualities.
Научная статья 
age of first insemination