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Originally Posted by Ladyhawk  Okay let's say that a genetic defect is associated with a sex linked gene. As a product of an inbreeding he would than be homozygous recessive for that gene. Because it is a sex linked gene it is carried by the male but shown by the female. He is bred and his daughter now is affected by this genetic defect. Inbreeding may make him prepotent for some excellent qualities but it would also make him prepotent for any bad ones that was in his line as well. |
I wonder how many of these inbred puppies were used in breeding programs knowing the increased risk, but because they did have the ability to improve type, they decided to take the risk?
I know of a Springer Spaniel line that was producing Champions left and right, but later they were going blind at five years old. Even an ethical, experienced breeder could be producing a serious flaw for several years before they knew it.