Polymorphism of prealbumins and transferring in blood serum of pigs of Polish Large white breed.

Determinations of prealbumin and transferrin phenotypes were made on 171 Large White Polish pigs. Family investigations proved that the prealbumins are determined by two alleles, Pa (A) and Pa (B) , which are inherited on the basis of co-domination. The frequency of alleles Pa A , Pa B , and Tf A , Tf B and Tf C amounts to 0,6637, 0,3363 and 0,4941, 0,5020 and 0,0039, respectively. No essential differences were noted between the breeding groups of animals of various phenotypes such as Pa AA, Pa AB, Pa BB and Tf AA, Tf AB when cons idering such factors as average number of piglets, average weights of litters after farrowing and at 21 days in age, average milking capacity of sows and evaluation of sows on a 100-point scale.