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Please explain EPDs.
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<blockquote data-quote="Brandonm2" data-source="post: 139541" data-attributes="member: 2095"><p>0 is the average of the breed for the year when the database began and the EPDs first calculated (officially). For Angus or Herford that would be sometime in the mid 70s. While those numbers are out there someplace, I would not worry about what was an avg birthweight or weaning weight in ~1975 Reg. Herefords. Your management and environment has more effect on your weaning weight and birth weight than the genetics do anyway. What the EPD is really telling me is that bull A with a +40 weaning wt EPD should give me an average of 10 pounds a calf weaning advantage over Bull B with a +30 EPD if bred to the same set of cows. Obviously cows grazing range in Montana are not going to wean as heavy a calf as a grain farm in Iowa or a family's small heavily managed set of show cattle. Real weaning weights can vary between 350 and 750 pounds on the same bull depending on what kind of cows you bred him to and how those cows were being managed under what environment. What the EPD is telling you is what that paticular animal should do when compared to those other animals in his contemporary group. Whether or not your calves' birth weights are heavier or not than the average 1975 birth weight really is not telling you much about the accuracy of the EPD.</p></blockquote><p></p>
[QUOTE="Brandonm2, post: 139541, member: 2095"] 0 is the average of the breed for the year when the database began and the EPDs first calculated (officially). For Angus or Herford that would be sometime in the mid 70s. While those numbers are out there someplace, I would not worry about what was an avg birthweight or weaning weight in ~1975 Reg. Herefords. Your management and environment has more effect on your weaning weight and birth weight than the genetics do anyway. What the EPD is really telling me is that bull A with a +40 weaning wt EPD should give me an average of 10 pounds a calf weaning advantage over Bull B with a +30 EPD if bred to the same set of cows. Obviously cows grazing range in Montana are not going to wean as heavy a calf as a grain farm in Iowa or a family's small heavily managed set of show cattle. Real weaning weights can vary between 350 and 750 pounds on the same bull depending on what kind of cows you bred him to and how those cows were being managed under what environment. What the EPD is telling you is what that paticular animal should do when compared to those other animals in his contemporary group. Whether or not your calves' birth weights are heavier or not than the average 1975 birth weight really is not telling you much about the accuracy of the EPD. [/QUOTE]
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