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EPD single trait rejection?
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<blockquote data-quote="Herefords.US" data-source="post: 1372329" data-attributes="member: 3972"><p>I'm not sure MY selection criteria will help you much, since I am a registered breeder who's trying to develop a linebred maternal line:</p><p></p><p>Cows: I select for calf structure and growth, with milking ability being the largest contributor to calf growth. That, balanced against their ability to stay in good shape and rebreed. I have found EPDs to be totally useless in cow selection. Too much variation can occur in the milk EPD and all the other EPDs are too low accuracy as well. I seen too many folks lament that the best cow in their herd has some of the WORST EPDs. If you look at the accuracy of the EPDs on cows, even those that have had several calves, you can understand why there is such a significant variation. Ratios are better indicators of cow performance...and what you can see with your eye. I don't get too high on the best performing heifers at weaning age and I will occasionally cull one for being too big. Outliers, either way, are potential trouble. I have found the best cows often come from the heifers that were back in the pack and maybe even a little underperforming as calves. So I keep a lot of heifers and cull liberally after their first and second calves.</p><p></p><p>Bulls: Phenotype and pedigree first, then if they pass that test, I look at their in herd ratios and actual weights and scans when possible. By pedigree, I particularly mean knowing as much as possible about a bull's dam and seeking the opinion of their owner and/or breeder. Learning about a bull's dam is very important if you are planning on keeping his daughters in your herd. I have been very lucky to buy some older proven bulls in the past and I had already seen their daughters in production and I had a record of what their daughters would do, as far as ratios. </p><p></p><p>In my latest UNPROVEN bull purchase, this month, I had seen his sire, his maternal grandsire, and all of his maternal great grandparents in person. He was an ET calf, so he has no BW, WW, or YW ratios. I bought him from a video and seeing his actual weights and scan measurements. He was delivered last week and I am happy with him, but I won't get too excited until I see a dozen of his calves on the ground. I am planning on returning to a timed AI program this fall, so he will see cleanup duty and only about 30-40% of the calves will be his.</p></blockquote><p></p>
[QUOTE="Herefords.US, post: 1372329, member: 3972"] I'm not sure MY selection criteria will help you much, since I am a registered breeder who's trying to develop a linebred maternal line: Cows: I select for calf structure and growth, with milking ability being the largest contributor to calf growth. That, balanced against their ability to stay in good shape and rebreed. I have found EPDs to be totally useless in cow selection. Too much variation can occur in the milk EPD and all the other EPDs are too low accuracy as well. I seen too many folks lament that the best cow in their herd has some of the WORST EPDs. If you look at the accuracy of the EPDs on cows, even those that have had several calves, you can understand why there is such a significant variation. Ratios are better indicators of cow performance...and what you can see with your eye. I don't get too high on the best performing heifers at weaning age and I will occasionally cull one for being too big. Outliers, either way, are potential trouble. I have found the best cows often come from the heifers that were back in the pack and maybe even a little underperforming as calves. So I keep a lot of heifers and cull liberally after their first and second calves. Bulls: Phenotype and pedigree first, then if they pass that test, I look at their in herd ratios and actual weights and scans when possible. By pedigree, I particularly mean knowing as much as possible about a bull's dam and seeking the opinion of their owner and/or breeder. Learning about a bull's dam is very important if you are planning on keeping his daughters in your herd. I have been very lucky to buy some older proven bulls in the past and I had already seen their daughters in production and I had a record of what their daughters would do, as far as ratios. In my latest UNPROVEN bull purchase, this month, I had seen his sire, his maternal grandsire, and all of his maternal great grandparents in person. He was an ET calf, so he has no BW, WW, or YW ratios. I bought him from a video and seeing his actual weights and scan measurements. He was delivered last week and I am happy with him, but I won't get too excited until I see a dozen of his calves on the ground. I am planning on returning to a timed AI program this fall, so he will see cleanup duty and only about 30-40% of the calves will be his. [/QUOTE]
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