genetic problems of cattle resistance to brucellosis i the age of having the disease the paternal influence and strain affiliation in the incidence of brucellosis morbidity from 2810 animals of blackandwhite breed of novosibirsk region diagnosed 31 fell ill young animals were found to be more resistant to brucellosis it is evidently more probable that they can reach the reproductive age intrapopulation hereditary heterogeneity to brucellosis was found the progeny of certain bulls has a higher resistance than others there is no statistical reliability of differences in the frequency of the disease between animal lines a normal distribution of fathers according to the frequency of daughters diseases can point to a polymeric type of the inheritance of resistance to brucellosis the coefficient of inheritability of brucellosis is 0194 003 the purebredness and mongrel of animals did not influence the frequency of the disease the crossing of cows of blackandwhite breed with bulls of holland blackandwhite breed did not influence the frequency of the disease of the hybrids of the first generation