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<blockquote data-quote="Ebenezer" data-source="post: 1327098" data-attributes="member: 24565"><p>I don't see how discussion of or actual data about calf mortality fits into $W data. I do see it the mature weight of the cow is lower then apparently it rewards the sire with higher $W due to cow's efficiency of eating less because she weighs less. Looks like weaning weight is a plus but MM is a minus, again, because the cow would eat more. Seems if a sire sires early growth, low mature weight and MM is shown as low it would allow the $W to be high. Looks like if feed intake is detrimental to $W then a fast growing calf that grazes/eats more would be as negative as the cow. Somehow they want big calves from small cows. Hard to do in a purebred operation without a constant yo-yo effect.</p><p></p><p>I guess they throw BW in there to assume that producers do not use judgment on selecting proper bulls to breed heifers? </p><p>And if high BW is a breed wide problem or negative, just pass a rule that no animal can be registered from parents if any of them generate a BW EPD over, what, say +4.0?</p></blockquote><p></p>
[QUOTE="Ebenezer, post: 1327098, member: 24565"] I don't see how discussion of or actual data about calf mortality fits into $W data. I do see it the mature weight of the cow is lower then apparently it rewards the sire with higher $W due to cow's efficiency of eating less because she weighs less. Looks like weaning weight is a plus but MM is a minus, again, because the cow would eat more. Seems if a sire sires early growth, low mature weight and MM is shown as low it would allow the $W to be high. Looks like if feed intake is detrimental to $W then a fast growing calf that grazes/eats more would be as negative as the cow. Somehow they want big calves from small cows. Hard to do in a purebred operation without a constant yo-yo effect. I guess they throw BW in there to assume that producers do not use judgment on selecting proper bulls to breed heifers? And if high BW is a breed wide problem or negative, just pass a rule that no animal can be registered from parents if any of them generate a BW EPD over, what, say +4.0? [/QUOTE]
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