THE ROLE OF GENOTYPE IN MORBIDITY OF COWS MASTITIS UNDER INTENSIVE maintenance TECHNOLOGY
The development of dairy cattle breeding involves the maximum use of gene pool to improve domestic breeding animals. This direction allows to reduce the susceptibility of animals to diseases of the breast. It is important to check the stud bulls for susceptibility of their daughters to mastitis. When planning breeding work with a herd, it is advisable to work not only with lines, but also with families. Our research, which was carried out in Shemyak OJSC of the Ufa district of the Republic of Bashkortostan, established that animals belonging to different morphological indicators are characterized by different resistance to mastitis. Scientific studies were carried out on cows of the black and motley breed aged from 3 to 7 years in an amount of 840 heads. It was established that the number of cows that reacted to Masttest-AF was 260 heads or 30.95% of the surveyed livestock. The cows, which gave a positive reaction to mastitis, belonged to the manufacturing bulls “Captain 169”, “Shooter 54”, “Shalun 1936” and had a bath-like and cupped udder shape. A positive reaction to Mastertest-AF was also noted in daughters represented by the bulls-makers. “Artist 2078”, “Vulkan 1312”, “Banker 109”, “Scarlet 1866”. The lowest incidence of mastitis was observed in cows with a milk yield of 5437.2 ± 311.5 kg (59 heads), and the highest - with a milk yield of 4936.37 ± 212.44 kg (134 heads).