Estimation of the bulls-sires on resistance to diseases of their daughters

By the method of one-factor analysis of variance the authors estimated the bulls-sires on resistance of their daughters to mastitis, pneumonia, leukosis, illness of a liver and finitenesses. They revealed the reliable influence of the bulls-sires on resistance of their daughters to these diseases and differences between bulls-sires on an parameters of absolute and relative disease and also on an indices of genetical stability of their daughters. It was marked, that tribal farms must treat statistically the data on morbidity among the daughters of different bulls-sires during wide spreading of some diseases in live farming. The authors recommend to use the sperm of bulls, which may be grade up the situation with specific disease.