Polymorphism of blood serum amylase and leptospirosis of pigs of large white polish breed.

In a population of 1460 head Large White Polish pigs, the authors proved the correlation between the phenotypes and alleles of blood serum amylase (Am) and the level of leptospira antibodies.With increase of the level of leptospira antibodies, the frequency of Am(A) allele also increased, and the frequency of Am(B) allele decreased.Am(B) allele seems to be in certain proportion positively connected with natural resistance of Large White Polish pigs to leptospirosis, contrary to Am(A) allele.The results of the investigations indicate the favourable mating of pigs having Am BB phenotypes, for the trait under consideration.