A study of linkage relationships of blood group P with naked neck, silkie feathering, and recessive white in chicken.

Linkage relationships of blood group P (Ea-P), naked neck (Na), silkie feathering (h), and recessive white plumage (c) were studied to attempt to clarify the h-Na-Ea-P region of linkage group III of the chicken. The Na-Ea-P linkage values obtained in this test agreed with previous reports, and pooled data were used to recalculate a map distance of 27.9 +/- 2.3 map units between these two loci. A significant chi square for linkage was calculated between Na and c; however, because of the relatively low numbers of progeny tested, the high linkage value calculated, and the absence of detectable linkage between c and the other marker genes, this was probably a chance deviation. All other linkage relationships appeared negative, supporting the current suggested linear order of these loci as h-Na-Ea-P with c not being in this chromosomal region.