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<blockquote data-quote="Bright Raven" data-source="post: 1415924" data-attributes="member: 27490"><p>I have concerns about what many are calling heterosis. On a genetic basis, heterosis is more applicable to genetic pools that have been isolated over long (even geologic) periods. When a population is isolated genetic diversity diminishes. Think of heterosis as the opposite of inbreeding. For example, if two populations of the same species are isolated by a physical barrier like water (lake), the two populations will lose diversity and the genes become stagnant. If after a million years, the lake disappears, and the two populations become reunited, their is a strong force in the gene pool caused by heterosis.</p><p></p><p>IMO, I have wondered if it is possible to have <strong>strong</strong> heterotic forces in cattle TODAY. Most of the breeds have the same source and there has been no real isolation. Add to that the influence of the creation of new breeds by crossing. I wonder if we have just about exhausted any significant heterotic forces.</p></blockquote><p></p>
[QUOTE="Bright Raven, post: 1415924, member: 27490"] I have concerns about what many are calling heterosis. On a genetic basis, heterosis is more applicable to genetic pools that have been isolated over long (even geologic) periods. When a population is isolated genetic diversity diminishes. Think of heterosis as the opposite of inbreeding. For example, if two populations of the same species are isolated by a physical barrier like water (lake), the two populations will lose diversity and the genes become stagnant. If after a million years, the lake disappears, and the two populations become reunited, their is a strong force in the gene pool caused by heterosis. IMO, I have wondered if it is possible to have [b]strong[/b] heterotic forces in cattle TODAY. Most of the breeds have the same source and there has been no real isolation. Add to that the influence of the creation of new breeds by crossing. I wonder if we have just about exhausted any significant heterotic forces. [/QUOTE]
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