W. M. Collins

TL;DR: The Japanese quail appears far advanced in its domestication, but when this research was initiated it could not find published reports on its use in selection experiments, so it was felt worthwhile to investigate how body size of quail would respond to artificial selection.

TL;DR: Jaap and Grimes (1956) presented evidence that in dominant white chickens interaction between the gene for inhibition of black plumage, I, and the genes for extended black plumages, E, suppressed body growth rate to eight weeks of age.

TL;DR: Genetic studies involving yellow-skinned chickens only, have indicated that genotype and sex influence the subjective score in pigmentation, and xanthophyll and lutein were the principal natural yellow pigments of the chicken skin and shank.

TL;DR: Hammond and Harshaw as discussed by the authors showed that the ration can decidedly influence the deposition of yellow pigment in the skin and shanks of the growing chicken, and showed that a high shank score was associated with a high skin pigment score, a low shank scored with a low skin color score.

TL;DR: Of all the structures of the egg, the yolk seems to be the least influenced by hereditary factors, and current interest in cholesterol as related to human health has stimulated the study of hereditary and other factors which influence yolk cholesterol level in chicken eggs.