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carcass EPDs
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<blockquote data-quote="dun" data-source="post: 7604" data-attributes="member: 34"><p>Ultrasound of a bull can be just as inaccurate as any other measurement. Overfeed a bull for fat and your backfat measurement will go up, raise him on pasture and the backfat will be less.</p><p>Data taken from his offspring at slaughter tells you waht a steer/heifer will have for backfat when fed to slaughter weight/finish.</p><p>I have serious doubts about cloning and the repeatability. ABS has two angus bulls that are split embryo clones. When the were young the EPDs were identical. As they have matured no only have their EPDs changed from each other, they don't even look as if they're related.</p><p>The cow has half of the influence in the offsrping EPD equation. If one bull is used on only large charolais type cows the hip height EPD will be a lot different then if it is used on smaller angus, Hereford, Galloway type cattle. But the accuracy will be pretty low also unless that's all he is used on and he's bred to hundreds of them.</p><p>By the time a bulls EPDs have reached high accuracy, above .90 they don't vary much. The only breed I've seen where they have changed radicaly was when the Hereford Association made a lot of changes a couple of years ago.</p><p>We use EPDs, researched for several generations back. But it is only one tool, just as physical evaluation is only one tool.</p><p></p><p>dun</p></blockquote><p></p>
[QUOTE="dun, post: 7604, member: 34"] Ultrasound of a bull can be just as inaccurate as any other measurement. Overfeed a bull for fat and your backfat measurement will go up, raise him on pasture and the backfat will be less. Data taken from his offspring at slaughter tells you waht a steer/heifer will have for backfat when fed to slaughter weight/finish. I have serious doubts about cloning and the repeatability. ABS has two angus bulls that are split embryo clones. When the were young the EPDs were identical. As they have matured no only have their EPDs changed from each other, they don't even look as if they're related. The cow has half of the influence in the offsrping EPD equation. If one bull is used on only large charolais type cows the hip height EPD will be a lot different then if it is used on smaller angus, Hereford, Galloway type cattle. But the accuracy will be pretty low also unless that's all he is used on and he's bred to hundreds of them. By the time a bulls EPDs have reached high accuracy, above .90 they don't vary much. The only breed I've seen where they have changed radicaly was when the Hereford Association made a lot of changes a couple of years ago. We use EPDs, researched for several generations back. But it is only one tool, just as physical evaluation is only one tool. dun [/QUOTE]
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