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<blockquote data-quote="txag" data-source="post: 30117" data-attributes="member: 8"><p>try this link</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><p></p><p>scroll down to the second page & there's an explanation of epd's. i can't tell you the mathematical formula used to calculate them but basically they're a <em>tool</em> used to compare animals of the same breed. data is sent in from herds all over the usa. the calculation is supposed to take into account the geographical location as well as the management (creep, no creep). it also takes into account not only the performance of the animal in question but his relatives as well (sire, dam, brothers, sisters, and offspring). for example, say you have a bull with a bw epd of +5. you can expect his calves, on average, to weigh 5 pounds heavier at birth than a bull with a bw epd of 0 or 10 pounds heavier than a bull with a bw epd of -5. same also goes for weaning weight epd's & yearling weight epd's. the milk epd is a little different (it is not measuring pounds of milk but pounds of calf)...........say you have a bull with a +15 milk epd. you would expect his daughters' calves to weigh 15 pounds heavier at weaning than the daughters of a bull with a milk epd of 0 due to his daughters' milk production. hope this helps explain the numbers.</p></blockquote><p></p>
[QUOTE="txag, post: 30117, member: 8"] try this link [url]http://www.hereford.org/Acrobat/Perf/ss_S04_Preface.pdf[/url] scroll down to the second page & there's an explanation of epd's. i can't tell you the mathematical formula used to calculate them but basically they're a [i]tool[/i] used to compare animals of the same breed. data is sent in from herds all over the usa. the calculation is supposed to take into account the geographical location as well as the management (creep, no creep). it also takes into account not only the performance of the animal in question but his relatives as well (sire, dam, brothers, sisters, and offspring). for example, say you have a bull with a bw epd of +5. you can expect his calves, on average, to weigh 5 pounds heavier at birth than a bull with a bw epd of 0 or 10 pounds heavier than a bull with a bw epd of -5. same also goes for weaning weight epd's & yearling weight epd's. the milk epd is a little different (it is not measuring pounds of milk but pounds of calf)...........say you have a bull with a +15 milk epd. you would expect his daughters' calves to weigh 15 pounds heavier at weaning than the daughters of a bull with a milk epd of 0 due to his daughters' milk production. hope this helps explain the numbers. [/QUOTE]
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