The production of white fleeces in sheep and goats has come about through the use of very complicated combinations of genes. These combinations have been developed by animal breeders over centuries as they have sought to develop white fibres for manufacturing uses. The occurrence of a few coloured fibres in otherwise white fleeced animals can usually be related to the"leakiness" of the combinations used for the usual whiteness of the fleece. The occurrence of coloured animals in otherwise white populations is usually the result of segregation of recessive alleles at a variety of loci.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XV. Beef cattle, sheep and pig genetics and breeding, fibre, fur and meat quality., , 177–180, 1990
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