Influence of the genotype of breeding bulls on the quality of sperm production

Abstract

The article presents the studies carried out at JSC “Krasnoyarskagroplem” during 2012-2015 years. The object of research is breeding-bulls of red-mottled and Holstein breeds and their sperm production. We compared two groups of bulls, a red-mottled breed (n = 18 heads) and the Holstein red-and-white suit (n = 18 heads) at the age of 24.3 months at the beginning of the study. The quality of sperm production was evaluated in accordance with the current GOST 23745-79 “Undiluted freshly obtained sperm of breeding bulls”. The fertilizing ability of sperm was evaluated by the insemination index. The authors revealed the dependence of the quantitative and qualitative indicators of the seed on the breed of bulls. The period of bull’s sexual functions formation of the Holstein breed ends at the age of four. The period of bull’s sexual functions formation of the red-mottled breed ends at the age of five. The insemination index of red-mottled bulls is on average 1.3, in Holstein bulls it is 1.7. It confirms that the quality of the sperm is good. Breeding bulls with a low insemination index were identified, e.g., Discont 29590 of the red-mottled breed has index of 2.4, Kozir 1676 and Snaiper 1802 of Holstein breed have indexes of 3.9 and 6.03, respectively.