MODERN METHODS OF ASSESSING THE REPRODUCTIVE CAPACITY OF BREEDING BULLS

Abstract

An improved scheme of andrological research is proposed, including an assessment of the quality of sperm, a score assessment of sexual reflexes, morphological and ultrasound examination of the semen. This andrological study will make it possible to comprehensively diagnose violations of the reproductive ability of breeding bulls. According to the results of the score assessment of sexual reflexes, 8 bulls were assigned to the group with high reproductive ability, 14 bulls with good, 2 heads with low, 1 bull with bad. Of the 6 bulls of the Kazakh white-headed breed, which belong to group II, despite a good level of sexual reflex, 2 have low sperm quality. Morphological study of the offspring showed that in 2 out of 3 bulls they were asymmetric, one bull was from a group with good reproductive ability.There is a correlation between the shape, size and quality of sperm, sperm motility in 2 bulls was 5 ± 0.3 points, and in 1 bull - 8 ± 0.01 points. Ultrasound examination of the seeds showed that in bulls with high and good reproductive capacity (65%), the structure of the seeds was smooth, oval in shape, and the protein shell wasa highly echogenic capsule. Morphological changes with an uneven contour were found in the parenchyma structure of bull semen (35%) from the group with low and weak reproductive ability. Hyperechogenic zones scattered throughout the parenchyma of the semen were revealed in 4 bulls with low sperm quality.