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$EN Criteria ?
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<blockquote data-quote="robert" data-source="post: 819801" data-attributes="member: 9171"><p>this is the AAA definition. Cow Energy Value ($EN), expressed in dollars savings per cow per year, assesses differences in cow energy requirements as an expected dollar savings difference in daughters of sires. A larger value is more favorable when comparing two animals (more dollars saved on feed energy expenses). Components for computing the cow $EN savings difference include lactation energy requirements and energy costs associated with differences in mature cow size.</p><p></p><p>The low milking, low mature weight cow will score higher on $EN because it only considers inputs based on EPD levels for milk, mature weight. There is no consideration of BCS, I think on the face of it the RA EPD (as opposed to a $ index) encourages a positive selection criteria with some practical application including BCS, not a huge fan of subjective measures in EPDs but I suspect they take the raw data from a herd and if the range of bcs is 5, 6 and 7 they reduce that to -1, 0 & +1 for EPD purposes. Neither the RA or BA tool includes an output, you could well reduce feed intake, equally though you could be just reducing frame size and milking ability, which may be a benefit if for example the number of open cows, particularly young cows, has been creeping up. There is no doubt that the cost of keeping the cow for a year to produce one calf is bay far the biggest chunk of the pie, and anything that can reduce that cost is a positive <em>providing</em> the output either remains the same, or improves, or does not get reduced disproportionately to that reduction in cost. </p><p></p><p>This is where this $index from AAA makes more sense to me "Weaned Calf Value ($W), an index value expressed in dollars per head, is the expected average difference in future progeny performance for preweaning merit. $W includes both revenue and cost adjustments associated with differences in birth weight, weaning direct growth, maternal milk, and mature cow size." it takes the components of $EN and sets that against output to arrive at the value. </p><p></p><p>Overall, I'm not looking for the extremes on any of this, the only time anyone gives a crap about the numbers is when the game of seedstock trading begins, for the rest of their lives all the cows have to do is meet my requirements and expectations within the parameters I've set for my operation, have a calf, raise it, make it keepable or saleable, do it with gentle good humor, and do it all again next year. Very simple it is when you boil it all down. </p><p></p><p>Here's an example of what I mean about $EN and $W, 9936489 look him up on the AAA site, $EN makes him look like a shining star, $W shows him up for the pos he was!</p></blockquote><p></p>
[QUOTE="robert, post: 819801, member: 9171"] this is the AAA definition. Cow Energy Value ($EN), expressed in dollars savings per cow per year, assesses differences in cow energy requirements as an expected dollar savings difference in daughters of sires. A larger value is more favorable when comparing two animals (more dollars saved on feed energy expenses). Components for computing the cow $EN savings difference include lactation energy requirements and energy costs associated with differences in mature cow size. The low milking, low mature weight cow will score higher on $EN because it only considers inputs based on EPD levels for milk, mature weight. There is no consideration of BCS, I think on the face of it the RA EPD (as opposed to a $ index) encourages a positive selection criteria with some practical application including BCS, not a huge fan of subjective measures in EPDs but I suspect they take the raw data from a herd and if the range of bcs is 5, 6 and 7 they reduce that to -1, 0 & +1 for EPD purposes. Neither the RA or BA tool includes an output, you could well reduce feed intake, equally though you could be just reducing frame size and milking ability, which may be a benefit if for example the number of open cows, particularly young cows, has been creeping up. There is no doubt that the cost of keeping the cow for a year to produce one calf is bay far the biggest chunk of the pie, and anything that can reduce that cost is a positive [i]providing[/i] the output either remains the same, or improves, or does not get reduced disproportionately to that reduction in cost. This is where this $index from AAA makes more sense to me "Weaned Calf Value ($W), an index value expressed in dollars per head, is the expected average difference in future progeny performance for preweaning merit. $W includes both revenue and cost adjustments associated with differences in birth weight, weaning direct growth, maternal milk, and mature cow size." it takes the components of $EN and sets that against output to arrive at the value. Overall, I'm not looking for the extremes on any of this, the only time anyone gives a crap about the numbers is when the game of seedstock trading begins, for the rest of their lives all the cows have to do is meet my requirements and expectations within the parameters I've set for my operation, have a calf, raise it, make it keepable or saleable, do it with gentle good humor, and do it all again next year. Very simple it is when you boil it all down. Here's an example of what I mean about $EN and $W, 9936489 look him up on the AAA site, $EN makes him look like a shining star, $W shows him up for the pos he was! [/QUOTE]
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