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2 Questions about Mature cow weight
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<blockquote data-quote="Aero" data-source="post: 514328" data-attributes="member: 2076"><p>to continue my metabolic weight sermon, my theory (which i think is the next logical step after % of dam weight) is to use a Metabolic Weight Ratio.</p><p></p><p>Metabolic Weight Ratio = calf weight / dam's metabolic weight</p><p></p><p>if you look at % weaned and expect 50+% from each cow, you are giving the big cows an unfair shake.</p><p></p><p>with this rule:</p><p>1000 lb cow must bring in a 500 lb calf.</p><p>1500 lb cow must bring in a 750 lb calf</p><p></p><p>the problem is that the big cow has to raise a calf that weighs 50% more and she didnt consume 50% more resources.</p><p></p><p>1000 lb met wt = 178 lb</p><p>1500 lb met wt = 241 lb</p><p></p><p>the big cow only consumed 35% more resources, but her calf has to weigh 50% more.</p><p></p><p>if you look at metabolic ratio as a measure of weaning merit, the 1500 lb cow's calf only has to weigh 675 lb to raise the same amount of calf/resources consumed. this would mean that their Met Wt Ratio is the same (2.8 lb of calf / lb of met wt).</p><p></p><p>say you decide that your cows should wean with a 2.8 MWR:</p><p></p><p><u>cow weight </u>| <u>Met Wt</u> | <u>calf weight</u></p><p>1000 | 178 | 498</p><p>1100 | 191 | 535</p><p>1200 | 204 | 571</p><p>1300 | 217 | 608</p><p>1400 | 229 | 641</p><p>1500 | 241 | 675</p><p>1600 | 253 | 708</p><p>1700 | 265 | 742</p><p>1800 | 276 | 773</p><p>the weights above show the same "efficiency" regardless of the cow weight.</p><p></p><p>notice that the 1000 lb cow raises 50% of her weight and the 1800 lb cow only has to raise 43% of her weight to be as efficient.</p></blockquote><p></p>
[QUOTE="Aero, post: 514328, member: 2076"] to continue my metabolic weight sermon, my theory (which i think is the next logical step after % of dam weight) is to use a Metabolic Weight Ratio. Metabolic Weight Ratio = calf weight / dam's metabolic weight if you look at % weaned and expect 50+% from each cow, you are giving the big cows an unfair shake. with this rule: 1000 lb cow must bring in a 500 lb calf. 1500 lb cow must bring in a 750 lb calf the problem is that the big cow has to raise a calf that weighs 50% more and she didnt consume 50% more resources. 1000 lb met wt = 178 lb 1500 lb met wt = 241 lb the big cow only consumed 35% more resources, but her calf has to weigh 50% more. if you look at metabolic ratio as a measure of weaning merit, the 1500 lb cow's calf only has to weigh 675 lb to raise the same amount of calf/resources consumed. this would mean that their Met Wt Ratio is the same (2.8 lb of calf / lb of met wt). say you decide that your cows should wean with a 2.8 MWR: [u]cow weight [/u]| [u]Met Wt[/u] | [u]calf weight[/u] 1000 | 178 | 498 1100 | 191 | 535 1200 | 204 | 571 1300 | 217 | 608 1400 | 229 | 641 1500 | 241 | 675 1600 | 253 | 708 1700 | 265 | 742 1800 | 276 | 773 the weights above show the same "efficiency" regardless of the cow weight. notice that the 1000 lb cow raises 50% of her weight and the 1800 lb cow only has to raise 43% of her weight to be as efficient. [/QUOTE]
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