The results of the use of imported from the USA semen of breeding bulls in the Nizhny Novgorod region

Purpose: Study of the results of the use of bull-producers imported from the United States in the conditions of the Nizhny Novgorod region.

Materials and methods. The work was performed in 2018-2019 in the farms of the Nizhny Novgorod region. The object of study - the heifers of the Holstein breed, which reached 360-380 kg of a living mass aged 13 months and above. Total experience used 495 heifers. Feeding chubs was carried out in accordance with feeding norms, taking into account the physiological state of animals. The insemination of the heifers was carried out by the rectocervical way after synchronization of hunting. We studied the number of seeds, the pregnancy from one insemination, the number of abortions and the number of repeated pubs within a month after the hotel. Statistical analysis of the data obtained was carried out in the SPSSV.15.0 program.

Results. It has been established that more than 70% of the heifers were invented at the age of 13-15 months. The pregnancy from one insemination was 58%. The best result (72.2%) was obtained in the group of heifers aged 19 months and above. The results of the study show that the seed season plays an essential role in seeding. The best indicators were obtained in the summer period - 60%, in autumn - 54% and in winter - 56%.

Conclusion. The data obtained give reason to believe that the optimal age of the insemination of the heifer is 13-15 months. The result of artificial insemination of the heifer has an influence of the season of the year in the insemination and season of birth of heifers, while the birth season as a factor has a higher value.

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