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The "GOLDEN EGG" - Feed Efficiency??
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<blockquote data-quote="Badlands" data-source="post: 545685" data-attributes="member: 5010"><p>Are we talking about efficiency or gain? Correlated traits, but not perfectly correlated. Only about 15% of the variation in FE is explained by gain.</p><p></p><p>FE is only the border between being moderately to highly heritable, so it is on the border between having moderate to low heterosis. However, crossbred cows will be more productive under range conditions, so the crossbred cow boosts net system efficiency via her improved reproductive performance, even if her crossbred progeny doesn't have a high level of heterosis for FE in the feedlot.</p><p></p><p>British cattle are more efficient to a fat-based endpoint, Continental cattle are more efficient to a pounds/retail product endpoint. The 50/50 mix can be finished to either endpoint, so they are more flexible. </p><p></p><p>How to you compare bull test numbers across herds? How to you account for the "pick" of one ranch versus another? How do you know if an RFI of -1.5 is worse than an RFI of -2.0 if the bulls came from different states but are in the same test?</p><p></p><p>Badlands</p></blockquote><p></p>
[QUOTE="Badlands, post: 545685, member: 5010"] Are we talking about efficiency or gain? Correlated traits, but not perfectly correlated. Only about 15% of the variation in FE is explained by gain. FE is only the border between being moderately to highly heritable, so it is on the border between having moderate to low heterosis. However, crossbred cows will be more productive under range conditions, so the crossbred cow boosts net system efficiency via her improved reproductive performance, even if her crossbred progeny doesn't have a high level of heterosis for FE in the feedlot. British cattle are more efficient to a fat-based endpoint, Continental cattle are more efficient to a pounds/retail product endpoint. The 50/50 mix can be finished to either endpoint, so they are more flexible. How to you compare bull test numbers across herds? How to you account for the "pick" of one ranch versus another? How do you know if an RFI of -1.5 is worse than an RFI of -2.0 if the bulls came from different states but are in the same test? Badlands [/QUOTE]
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