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Originally Posted by jpops757
Dosent inbreeding magnify the quality but dont you takethe chance of magnifing the BAD also?
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That's why breeders cull! Or at least they used to. Geld the colts who get the bad stuff, so it can't be passed on, sell them for riding horses. Inbred fillies sometimes produce better than they run so some breeders retain them to experiment with, otherwise, like the polo pony I rode at one Bluegrass Farm, should be taken out of the TB gene pool. Nobody put a fortune into any one breeding in those days so a failed experiment wasn't the end of the farm.