Abstract

For modern cattle industry, it is very important to evaluate bull-sires of different breeds by semen quality. The relevance of this problem arises in the context of development of artificial insemination technologies and biotechnology, the increasing role of sire-bulls in the genetic improvement of the herd, which makes it possible to significantly change the breed composition of herds in large regions in a short period of time.In cattle breeding, sires of Black-and-white and Holstein black-and-white breeds, which are imported into the Russian Federation, are used almost throughout the country.The purpose of the study is to assess the practical possibility of using the measured data of the bioelectric potential of superficially localized biologically active centres of sire-bulls to evaluate the quality of their semen production.The subject of the study was the semen production of the bulls of Black-and-white and Holstein blackand-white breeds. The groups were formed according to the principle of analogues; the bulls were from 2 to 4 years old; the body weight was from 700 to 800 kg.As a result of evaluating the sperm quality in sire-bulls with a high level of biopotential of the superficially localized biologically active centres, in the field of vision of the preparation, spermatozoa with an intact acrosome were found, which amounted to 96.5% of the total number of spermatozoa of the preparation and had a significant difference with the experimental group. The use of bioenergetic data of the superficially localized biologically active centres makes it possible to evaluate the sperm quality before semen collection and thereby, reduce the time and labour costs for low-quality ejaculates culling.

Highlights

  • Evaluation of sire-bulls on the quality of semen production is an important point in the context of industrial dairy farming

  • The expedience of this issue arose as a result of the active development of biotechnology of artificial insemination and an increase in the importance of sire-bulls in the genetic improvement of the whole population, a breed or individual herds [3, 7]

  • The semen production collected from sire-bulls must contain a sufficient amount of living sperm cells, which are stable in the external environment and capable of taking part in fertilization

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Summary

Introduction

Evaluation of sire-bulls on the quality of semen production is an important point in the context of industrial dairy farming. The expedience of this issue arose as a result of the active development of biotechnology of artificial insemination and an increase in the importance of sire-bulls in the genetic improvement of the whole population, a breed or individual herds [3, 7]. The semen production collected from sire-bulls must contain a sufficient amount of living sperm cells, which are stable in the external environment and capable of taking part in fertilization. The absence and damage of an acrosome in a sperm cell is caused by a violation of the process of spermatogenesis with a genetic determination to this disease

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