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Originally Posted by pgardn
Is there a fast gene? Is there an endurance gene?
I wonder why horses that win races are more highly bred than those that never break their maiden? If genetics plays no role in soundness, or a minor role, then it seems logical it should play a minor role in speed and endurance.
Yes?
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No because soundness is not the same thing as talent. If a horse steps on a nail he will be unsound for a period of time. If he is slow he will always be slow. There are certainly fast twitch and slow twitch muscles. Alot of what is passed on is size and shape. For the most part a heavily muscled, short cropped horse wont have the same amount of stamina as a tall, rangy horse. They can inheirit the size and or shape from either side of the pedigree.