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<blockquote data-quote="cbcr" data-source="post: 1539193" data-attributes="member: 16303"><p>The way that the ASA does their EPD's for new animals entering the system is supposed to be the breed average for the year of birth is what we have heard and been told.</p><p></p><p>This doesn't always happen and some animals come in and start with a zero, which makes the EPD's from this not very accurate.</p><p></p><p>Their EPD's are multi-breed, but we are hearing that bulls that had good EPD's before the multi breed EPD's now are not very good. Hard to explain to a bull buyer.</p><p></p><p>We have seen it in evaluations that do multi-breed and within breed evaluations. We have seen animals that within breed be in the very top end for calving ease, but them on a multi-breed basis not be very good for calving ease.</p><p></p><p>The genetic evaluations only look at the birth weight of the calf, but what about the cow? A cow should give birth to a calf that is around 6% of her body weight. So a 1000 lb cow should have a 60 lb calf,a 1200 lb cow should be able to have a 72 lb calf and a 1500 lb cow should have an 90 lb calf. But if these were bulls and the buyer was only looking at the birth weights they would not consider the 90 lb calf.</p><p></p><p>To more accurately figure calving ease, the weight of the cow at calving should be used.</p></blockquote><p></p>
[QUOTE="cbcr, post: 1539193, member: 16303"] The way that the ASA does their EPD's for new animals entering the system is supposed to be the breed average for the year of birth is what we have heard and been told. This doesn't always happen and some animals come in and start with a zero, which makes the EPD's from this not very accurate. Their EPD's are multi-breed, but we are hearing that bulls that had good EPD's before the multi breed EPD's now are not very good. Hard to explain to a bull buyer. We have seen it in evaluations that do multi-breed and within breed evaluations. We have seen animals that within breed be in the very top end for calving ease, but them on a multi-breed basis not be very good for calving ease. The genetic evaluations only look at the birth weight of the calf, but what about the cow? A cow should give birth to a calf that is around 6% of her body weight. So a 1000 lb cow should have a 60 lb calf,a 1200 lb cow should be able to have a 72 lb calf and a 1500 lb cow should have an 90 lb calf. But if these were bulls and the buyer was only looking at the birth weights they would not consider the 90 lb calf. To more accurately figure calving ease, the weight of the cow at calving should be used. [/QUOTE]
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