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<blockquote data-quote="alexfarms" data-source="post: 687112" data-attributes="member: 8677"><p>Here is an article on heritability estimates of fertility in beef cattle.</p><p></p><p><a href="http://jas.fass.org/cgi/content/abstract/67/10/2589" target="_blank">http://jas.fass.org/cgi/content/abstract/67/10/2589</a></p><p></p><p>To summarize a bit, it states various studies have concluded that cow fertility heritabiliy estimates range from a high of .17 to a low of .01. The article concludes: "Heritability estimates in this study are in agreement with the literature, indicating little opportunity for improvement in pregnancy rate by selection within a breed". Heritablity estimates for cow fertility are very low.</p><p></p><p>Here is an article on Heritability estimates of carcass traits in beef cattle.</p><p></p><p><a href="http://www.funpecrp.com.br/GMR/year2004/vol3-3/gmr0102_full_text.htm" target="_blank">http://www.funpecrp.com.br/GMR/year2004 ... l_text.htm</a></p><p></p><p>To summarize a bit, the article states most of the carcass traits are moderately heritable, rangeing from .37 to .40, and Yield grade is highly heritable at .64. In referring to Yield grade's high heritability estimate the article states: "indicating that this carcass trait is highly heritable and genetic merit might be improved through selection."</p><p></p><p>SO, AS SEEDSTOCK PRODUCERS, WHICH TRAITS SHOULD WE BE SELECTING FOR MOST DILIGENTLY: Cow fertility or carcass traits?</p></blockquote><p></p>
[QUOTE="alexfarms, post: 687112, member: 8677"] Here is an article on heritability estimates of fertility in beef cattle. [url=http://jas.fass.org/cgi/content/abstract/67/10/2589]http://jas.fass.org/cgi/content/abstract/67/10/2589[/url] To summarize a bit, it states various studies have concluded that cow fertility heritabiliy estimates range from a high of .17 to a low of .01. The article concludes: "Heritability estimates in this study are in agreement with the literature, indicating little opportunity for improvement in pregnancy rate by selection within a breed". Heritablity estimates for cow fertility are very low. Here is an article on Heritability estimates of carcass traits in beef cattle. [url=http://www.funpecrp.com.br/GMR/year2004/vol3-3/gmr0102_full_text.htm]http://www.funpecrp.com.br/GMR/year2004 ... l_text.htm[/url] To summarize a bit, the article states most of the carcass traits are moderately heritable, rangeing from .37 to .40, and Yield grade is highly heritable at .64. In referring to Yield grade's high heritability estimate the article states: "indicating that this carcass trait is highly heritable and genetic merit might be improved through selection." SO, AS SEEDSTOCK PRODUCERS, WHICH TRAITS SHOULD WE BE SELECTING FOR MOST DILIGENTLY: Cow fertility or carcass traits? [/QUOTE]
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