You can find examples on pheasant MHC gene DNA sequence here . In a sample of 110 pheasant males from our study area we found a significant difference in spur length between different MHC genotypes. References Grahn, M. 1993. Mortality in the pheasant Phasianus colchicus during the breeding season. Male characteristics, viability, and harem size in the pheasant Phasianus colchicus.
Female choice selects for a viability-based male trait in pheasants.
Intersexual selection and reproductive success in the pheasant Phasianus colchicus . Molecular characterization of three Mhc class II B haplotypes in the ring-necked pheasant.