Combinations of four alpha -2-globulin allotypes were studied for their dis
tribution in pigs of nine different breeds and hybrid groups. Based on this
analysis, a new, previously unpublished polyallelic genetic system designa
ted A2G was postulated. The complex alleles of this system control alpha -2
-globulin allotypes and are suggested to be encoded by genes of two subloci
. One of these subloci is virtually monomorphic, whereas the Other has at l
east four allelic variants.