Only a dozen or so specific genetic defects of reproduction are known in cattle (Lauvergne, 1968; B ishop, 1972). Some, like cryptorchidism, occur in all, and others only in certain breeds. Most breeds, however possess one potentially serious genetic infertility. Compared to environmental factors, they are a minor cause of infertility. Nonetheless, they are a hazard. Many animals carry them, A. I. could transmit them and control is essential.

G. B Young

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 1, Madrid, Spain, 57–63, 1974
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