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EPD's What Do They Mean?
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<blockquote data-quote="Brandonm2" data-source="post: 170051" data-attributes="member: 2095"><p>Yes, obviously if a bull has the phenotype to perform well on the EPD for a given trait that should usually reflect in his calves performances. Of course we are talking about high accuracy EPDs here based on progeny performance. There is nobody out there looking at yearling bulls to adjust their EPDs up or down based on phenotype. That young bull's EPDs are based on the average performance of his pedigree and IF he is different phenotypically (for better or for worse) from his Sire and Maternal Grand Sire it is NOT factored in to the equation yet, why young bulls typically have accuracy below 25%. </p><p></p><p>One word of caution for really LOW input ranchers. I don't think MOST operations which are reporting birth wts, weaning wts, scrotal circumferences, Calving ease scores, yearling wts, yearling hip heights, mature cow weights, yearling ultrasound data, etc are typically low input producers. IF you own 20,000 acres of west Texas scrub in which 150 x-bred commercial cows wander around largely unattended until fall roundup, I am not real convinced that selecting bulls with the highest growth EPDs is going to serve your interests real well, particularly if you are planning on keeping the heifers. There you may need a moderate framed, grass raised, deep ribbed, big gutted, but not too long bull with exceptional feet and legs and finding that phenotype bull could mean accepting less than stellar EPDs in several categories.</p></blockquote><p></p>
[QUOTE="Brandonm2, post: 170051, member: 2095"] Yes, obviously if a bull has the phenotype to perform well on the EPD for a given trait that should usually reflect in his calves performances. Of course we are talking about high accuracy EPDs here based on progeny performance. There is nobody out there looking at yearling bulls to adjust their EPDs up or down based on phenotype. That young bull's EPDs are based on the average performance of his pedigree and IF he is different phenotypically (for better or for worse) from his Sire and Maternal Grand Sire it is NOT factored in to the equation yet, why young bulls typically have accuracy below 25%. One word of caution for really LOW input ranchers. I don't think MOST operations which are reporting birth wts, weaning wts, scrotal circumferences, Calving ease scores, yearling wts, yearling hip heights, mature cow weights, yearling ultrasound data, etc are typically low input producers. IF you own 20,000 acres of west Texas scrub in which 150 x-bred commercial cows wander around largely unattended until fall roundup, I am not real convinced that selecting bulls with the highest growth EPDs is going to serve your interests real well, particularly if you are planning on keeping the heifers. There you may need a moderate framed, grass raised, deep ribbed, big gutted, but not too long bull with exceptional feet and legs and finding that phenotype bull could mean accepting less than stellar EPDs in several categories. [/QUOTE]
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