Analysis of the alloimmune properties of a recombinant genotype in the major histocompatibility complex of the chicken.

In a population of (CB X CC)F1 X WB hybrids, a chicken was found with a presumably recombinant haplotype, BR1, whose antigenic products detectable by hemagglutination contained determinants derived from both parental haplotypes, i.e. B1 (from CB) and B2 (from CC).

Development of immunity against antigens of the A and B blood groups during postembryogenesis in chickens.

51Cr-labelled erythrocytes were injected into young chicks, F1 hybrids of the inbred chicken lines, from hatching to 2 months of age. The onset of immunity was measured by means of elimination of labelled red blood cells. It was found that with the B-locus difference between donors and recipients the immune response developed from 4 days of age to the end of the first week, whereas with the A-locus difference it developed during the second week of life.