Two types of pigment are found in the hair coat of mammals, eumelanin, which exists in two forms, black and brown, and phaeomelanin, which is yellow or red.

The various steps leading to the final colour type visible in the animal are almost invariably gene controlled. Much of the research on the effect of genes on colours has been carried out with laboratory animals. A comprehensive review of these processes has been given by Searle (1968).

S. Adalsteinsson

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 1, Madrid, Spain, 29–37, 1974
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