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<blockquote data-quote="txag" data-source="post: 60409" data-attributes="member: 8"><p>remember......epd's are just a <em>tool</em> to be used in conjuction with all the other evaluation/purchasing options. i would never recommend purchasing an animal on epd's alone.</p><p></p><p></p><p></p><p>it's not exact and it's not flawless. surely you have to admit that bulls that sometimes look the best don't always produce the best looking calves, either?</p><p></p><p> </p><p></p><p>you're right. this happens all the time, but it's not just with epd's. sometimes catalogs won't list a weaning weight but they'll put a low birthweight & advertise him as a low birthweight bull & vice versa. i've also seen adjusted 205-weights given when actual is not disclosed. i think adjusted weights almost always work to the advantage of the calves weaned earlier rather than later. or maybe carcass data is listed instead of weights or epd's. also...it works the other way as well.....actual weights may be given instead of epd's (if the epd's aren't up to par). is this right? maybe. is it good marketing? probably. </p><p></p><p> </p><p></p><p>once again, epd's will never give an actual weight......even if you know the breed average. epd's are designed to be a <em>comparison</em> between animals, not an exact weight. another thing epd's do not do is give estimates for the animal in question. epd's are "expected <strong>progeny</strong> differences" so it's an estimate of how his calves will perform not how he will perform.</p><p></p><p> </p><p></p><p>i'm not sure i follow you here. with herefords, calves are assigned epd's as soon as they are registered. for an animal without offspring, his/her epd's are simply as you mentioned....sire + dam divided by two. is he/she an exact middle of the two parents? no, but until the animal in question has progeny of their own, the best estimate is to assume it inherited equally from both parents.</p><p></p><p></p><p></p><p>sorry, but can't tell you <em>how</em> they calculate it, but geographical location is supposed to be included in the calculation somehow. that's why there are contemporary groups....animals in the same environment & managment are compared to each other. you may want to contact one of the breed associations. someone there may be able to answer your question or direct you to someone who can (maybe the university that set up the epd calculations)</p><p></p><p>here is a link to the '04 AHA sire summary preface with a very good explanation of epd's:</p><p></p><p><a href="http://www.hereford.org/Acrobat/Perf/ss_S04_Preface.pdf" target="_blank">http://www.hereford.org/Acrobat/Perf/ss_S04_Preface.pdf</a></p></blockquote><p></p>
[QUOTE="txag, post: 60409, member: 8"] remember......epd's are just a [i]tool[/i] to be used in conjuction with all the other evaluation/purchasing options. i would never recommend purchasing an animal on epd's alone. it's not exact and it's not flawless. surely you have to admit that bulls that sometimes look the best don't always produce the best looking calves, either? you're right. this happens all the time, but it's not just with epd's. sometimes catalogs won't list a weaning weight but they'll put a low birthweight & advertise him as a low birthweight bull & vice versa. i've also seen adjusted 205-weights given when actual is not disclosed. i think adjusted weights almost always work to the advantage of the calves weaned earlier rather than later. or maybe carcass data is listed instead of weights or epd's. also...it works the other way as well.....actual weights may be given instead of epd's (if the epd's aren't up to par). is this right? maybe. is it good marketing? probably. once again, epd's will never give an actual weight......even if you know the breed average. epd's are designed to be a [i]comparison[/i] between animals, not an exact weight. another thing epd's do not do is give estimates for the animal in question. epd's are "expected [b]progeny[/b] differences" so it's an estimate of how his calves will perform not how he will perform. i'm not sure i follow you here. with herefords, calves are assigned epd's as soon as they are registered. for an animal without offspring, his/her epd's are simply as you mentioned....sire + dam divided by two. is he/she an exact middle of the two parents? no, but until the animal in question has progeny of their own, the best estimate is to assume it inherited equally from both parents. sorry, but can't tell you [i]how[/i] they calculate it, but geographical location is supposed to be included in the calculation somehow. that's why there are contemporary groups....animals in the same environment & managment are compared to each other. you may want to contact one of the breed associations. someone there may be able to answer your question or direct you to someone who can (maybe the university that set up the epd calculations) here is a link to the '04 AHA sire summary preface with a very good explanation of epd's: [url=http://www.hereford.org/Acrobat/Perf/ss_S04_Preface.pdf]http://www.hereford.org/Acrobat/Perf/ss_S04_Preface.pdf[/url] [/QUOTE]
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