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Ohlde vs EPDS
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<blockquote data-quote="Rmc" data-source="post: 1744197" data-attributes="member: 39072"><p>Best way to eliminate epd bias against linebeeding?</p><p>Stop using them. Registries will not</p><p>promote the use of box of crayon hided cattle.</p><p>Yet that is exactly what epds promote in more important genetic traits in cattle. Epds promote variation (box of crayon genetics) genetics.</p><p>Consistency and predictability in breeding is based on homozygousity</p><p>And prepotency of traits in the breeding animals both of which are discouraged with epds.</p><p>Very basic breeding science says that if you take two totally different linebred strains of animals the resulting offspring will be far superior than either parent. This is known as hybrid vigor or heterozygosity. In each successive generation you will loose some of the benifits of this mating so all matings after your offspring will revert towards lower quality than their parents.</p><p>Imho epds promote this continued mating that will result in lower quality animals than their parents.</p><p>When in fact the mating that would produce the best offspring is the original matting of two different line bred strains.</p><p>Another example you have a herd of line bred cows . You ai the best 100 cows to five different totally unrelated bulls .</p><p>All offspring regardless of which bull used are very similar in type and weight.</p><p>These calves would bring a significant premium because of similar type and size. Yet the epds from the bulls would suffer because their would be little variation between the offspring of each of these five bulls among their offspring. Epds would be better if you used a box of crayons genetic herd that would produce a few supioror animals at the expense of having the majority of the herd lower quality</p></blockquote><p></p>
[QUOTE="Rmc, post: 1744197, member: 39072"] Best way to eliminate epd bias against linebeeding? Stop using them. Registries will not promote the use of box of crayon hided cattle. Yet that is exactly what epds promote in more important genetic traits in cattle. Epds promote variation (box of crayon genetics) genetics. Consistency and predictability in breeding is based on homozygousity And prepotency of traits in the breeding animals both of which are discouraged with epds. Very basic breeding science says that if you take two totally different linebred strains of animals the resulting offspring will be far superior than either parent. This is known as hybrid vigor or heterozygosity. In each successive generation you will loose some of the benifits of this mating so all matings after your offspring will revert towards lower quality than their parents. Imho epds promote this continued mating that will result in lower quality animals than their parents. When in fact the mating that would produce the best offspring is the original matting of two different line bred strains. Another example you have a herd of line bred cows . You ai the best 100 cows to five different totally unrelated bulls . All offspring regardless of which bull used are very similar in type and weight. These calves would bring a significant premium because of similar type and size. Yet the epds from the bulls would suffer because their would be little variation between the offspring of each of these five bulls among their offspring. Epds would be better if you used a box of crayons genetic herd that would produce a few supioror animals at the expense of having the majority of the herd lower quality [/QUOTE]
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