Volga Region Farmland (Mar 2021)
INFLUENCE OF BREED AND COUNTRY OF ORIGIN ON INDICATORS OF SEMEN PRODUCTION OF STUD BULLS
Abstract
The article presents data on the influence of the breed of linear affiliation, country of origin on the quality indicators of sperm production of sire bulls. The research was carried out on bulls of Holstein, Black Pied, Brown Swiss and Hereford bulls at the age of 2-6 years in OOO Nizhegorodskoie for Stock Breeding. In our studies, bulls of different breeds differed from each other in qualitative and quantitative indicators. Holstein bulls had the largest volume of ejaculate, 7.57 ± 0.19 ml, in the context of the lineages the fluctuations were insignificant. The highest concentration of sperm was found in the ejaculate of Hereford beef bulls, 0.789 ± 0.105 billion/ml. The best sperm activity was found in Holstein and Brown Swiss bulls (6.42 and 6.47 points, respectively). The influence of the breed on the volume of ejaculate was 34.4%, on the concentration of sperm in the ejaculate – 18.8%, on the activity of sperm – 25.6%. The average volume of ejaculate is a rather variable sign. The coefficient of variability ranges from 10.7 to 32.1%. The sperm concentration has slightly less variability, the coefficient of variability is 11.8-24.8%. The variability in sperm activity was the lowest of the three studied parameters. The lowest value of the coefficient of variation of sperm activity was found in the Laird lineage of Brown Swiss bulls, 0.1%; the highest in Hereford bulls, 10.6%. The number of sperm doses stored in the storage depends to a greater extent on the activity of sperm cells (r = 0.421), to a lesser extent on their concentration in the ejaculate (r = 0.375). Holstein bulls from Canada are of full age (5-6 years), which is why they exceeded domestic stud bulls in terms of ejaculate volume and sperm activity with statistical significance. The difference in sperm concentration between stud bulls has not been established.
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