Improving the quality of breeding bulls' sperm production

The purpose of the study was to improve the quality of sperm production of pedigree bulls. The research objectives were to study the feeding of breeding bulls; to study the quality of sperm production; to make biochemical analysis of animal blood. The study was conducted in the conditions of pedigree farm JSC "Krasnoyaragroplem" S. Solontsy, Emelyanovsky district of Krasnoyarsk Region. Since the most popular in this region was red-and-mottley Holstein breed 2 groups of animals of this breed, born in 2016 were formed, with 6 heads in each by the method of pairs-analogues. During the experiment the feeding of breeding bulls was studied. To do this, the structure of the diet was changed, reducing the number of coarse feeds by 24 % (compared to the control), and introduced needles, which account for 1.1 % of the number of coarse feeds. To balance the diet in terms of carotene content, the daily allowance of carrots to bulls in the experimental group was increased by 4.1 kg, and to balance the diet in terms of digestible protein, sunflower cake was added by 1.4 kg more than the diet of the control group. As a result of the addition of fir needles in combination with carrots, there was an improvement in the quality of sperm production and blood indicators of the bulls. The volume of ejaculate was greater by 0.11 ml, and the concentration of sperm was 0.09 billion/ml compared to the sperm of the bulls in the control group. Also, the bulls of experimental group did not any have drawbacks of native sperm, while in the control group the drawback was 4.0 ml (14.52 %). The content of carotene in the blood of experimental group was higher compared to the blood of control group by 0.37 mg, as well as an increase in phosphorus, calcium, magnesium, iron by 1.41 mmol/l, 2.98, 1.33 and 17.6 mmol/l, respectively. Thus, the use of feed with a high content of carotene carrots and fir needles in the diet improves the quality of sperm production of breeding bulls.