H blood group genotypes and expression of A and 0 antigens in pigs

Abstract

Summary Tests of over 2000 pigs, with the blood group reagents Ac, Ap and 0, and the reagents Ha, Hb, He, Hd, He and Hc/c, confirmed that the H locus affects the expression of A and 0 antigens. The ‘exceptional’ phenotypes Ap and — were found in Ha homozygotes of Miniature pigs and in Hcd homozygotes of a semi‐inbred Landrace line. They were also found in unrelated pigs of other breeds, and moreover in some individuals with genotypes H a H cd , H ab H cd , H‐H‐ and H a H ab or H ab H ab . The mechanism of the effect of the H locus on the A phenotypes may consist in the interaction of certain, not yet completely defined, H genotypes, or in linkage of the H system with the hypothetical ‘ S ’ locus.