PRODUCTIVE LONGEVITY AND REASONS FOR CHOOSING COWS OF BLACK AND PESTROY BREED
There is an urgent and urgent need to monitor the situation in our country in order to identify the influence of various factors on the duration of the productive life of cows, taking into account the pedigree of animals, the regional location and the technology of milk production. Object of research: cows of black and motley breed. The average age of cows of black and motley breeds in the Udmurt Republic is an average of 3.4 calves. The main reason for the culling of sex-age cows and first-calf cows is gynecological diseases, the calfness is from 27.95% to 35.72%. For reasons of low productivity, 12.68 to 17.76% are discarded, udder diseases from 14.90% to 16.70%, limb diseases from 11.89% to 14.84%.