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<blockquote data-quote="Son of Butch" data-source="post: 1338377" data-attributes="member: 14585"><p>Japanese Wagyu make for a great study on the effects of line breeding and inbreeding.</p><p>Because Japan is both an island nation and because importing cattle was barred for long periods of time.</p><p></p><p>Survival of the fittest. In 1900 there were 9 breeds or bloodlines each mostly located in a different region in Japan.</p><p>Today only 4 of the 9 lines considered native survived. 5 lines culled themselves from the islands, mostly due to genetic defects relating to reproductive failure, calf mortality or longevity, because of intensive line/inbreeding. </p><p></p><p>This supports the idea, that when intensively line breeding, no more than 40% of the offspring are suitable as </p><p>breeding stock and the other 60% should be fed out as terminal cattle.</p><p>My personal opinion is only the top 1/3 of any breeding program should be considered for replacements.</p></blockquote><p></p>
[QUOTE="Son of Butch, post: 1338377, member: 14585"] Japanese Wagyu make for a great study on the effects of line breeding and inbreeding. Because Japan is both an island nation and because importing cattle was barred for long periods of time. Survival of the fittest. In 1900 there were 9 breeds or bloodlines each mostly located in a different region in Japan. Today only 4 of the 9 lines considered native survived. 5 lines culled themselves from the islands, mostly due to genetic defects relating to reproductive failure, calf mortality or longevity, because of intensive line/inbreeding. This supports the idea, that when intensively line breeding, no more than 40% of the offspring are suitable as breeding stock and the other 60% should be fed out as terminal cattle. My personal opinion is only the top 1/3 of any breeding program should be considered for replacements. [/QUOTE]
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