At least 260 v isib le tra its of cattle, excluding coat colors and patterns, have been reported to be under control of major genes. While some o f these tra its resemble others in certain anatomical, physiological, or pathological features, dissim ilarities among them, including their occurrence in separate breeds o f ca ttle, argue for control by separate lo ci. Despite the scanty evidence available for some loci, visib le tra it loci collectively represent the largest group known in cattle. Only a few have been assigned gene symbols, usually as examples in textbooks.

K. Huston, H. W Leipold

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIV. Dairy cattle genetics and breeding, adaptation and conservation., , 525–528, 1990
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