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Thoughts on Across Breed EPD's
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<blockquote data-quote="Anonymous" data-source="post: 6563"><p>Rancher,</p><p></p><p>I did not bvelieve the accross EPD table either. As you point out it does stand the simple comparision tests. So I called the author Larry Cundiff at MARC. The data is biased as I suspected. The numbers are based on data collected aty MARC from the top 50 bulls for registrations in each given year for each breed since the early 1970's. What this means is that this table is more a representation of where the breeder aspire their animals to be performance wise not actually where they are at. The angus breeders emphasized performance above all else and breeds like the charolais and simmental emphasized traits like calving ease in AI bull selection, hence they way the results look in the table. Larry agrees with this analysis. If you have any questions I suggest calling Larry up. He is a very nice guy and easy to talk to about breeding programs. Lastly, a good performance recording system should include data from random matings on commerical cows. this does two things. It lets each bull have an equal opputunity to show his genetic potential and how well they perform in a comerical environment; the whole point of perforance data in the first place.</p><p></p><p>Mark</p><p>> In an attempt to compare apples to</p><p>> apples in relation to different</p><p>> beef breeds, I took the most</p><p>> recent breed average EPDs and</p><p>> adjusted them based on the 2003</p><p>> Across Breed EPD adjustments.</p><p></p><p>> I compared Angus, Red Angus,</p><p>> Hereford, Limousin, Simmental,</p><p>> Charolais, and Gelbvieh since</p><p>> these are the most popular breeds</p><p>> in my area of the northern corn</p><p>> belt.</p><p></p><p>> When I evaluated the adjusted</p><p>> numbers they didn't look right.</p><p>> For example, the average Angus</p><p>> sire has a 1.6 pound lighter birth</p><p>> weight, 13.1 pound heavier</p><p>> yearling weight, and 12.7 more</p><p>> pounds of milk than the average</p><p>> Red Angus sire. This surprised me</p><p>> since Red Angus, as a breed, has</p><p>> REQUIRED performance testing since</p><p>> the inception of their breed</p><p>> registry.</p><p></p><p>> Several of the other breed</p><p>> comparisons also look incorrect.</p><p>> For example the average Angus</p><p>> sires milk EPD is 2.2 pounds</p><p>> heavier than the average</p><p>> Simmentals. I DON'T BELIEVE THIS.</p><p></p><p>> I found on the Gelbvieh website</p><p>> that the American Gelbvieh Assn.</p><p>> (AGA) was concerned with this data</p><p>> also. As they pointed out, the</p><p>> Across Breed EPDs, which were</p><p>> developed by the Meat Animal</p><p>> Research Center (MARC) were</p><p>> developed based on "very</p><p>> small sample sizes at a single</p><p>> location." Consequently, the</p><p>> AGA has developed their own Across</p><p>> Breed EPDs for comparing Gelbvieh</p><p>> to Angus and Red Angus which look</p><p>> much more in line.</p><p></p><p>> Does anyone else have any thoughts</p><p>> on the MARC Across Breed EPD</p><p>> accuracies?</p><p></p><p></p><p></p><p> <a href="mailto:mhickox@vcnet.com">mhickox@vcnet.com</a></p></blockquote><p></p>
[QUOTE="Anonymous, post: 6563"] Rancher, I did not bvelieve the accross EPD table either. As you point out it does stand the simple comparision tests. So I called the author Larry Cundiff at MARC. The data is biased as I suspected. The numbers are based on data collected aty MARC from the top 50 bulls for registrations in each given year for each breed since the early 1970's. What this means is that this table is more a representation of where the breeder aspire their animals to be performance wise not actually where they are at. The angus breeders emphasized performance above all else and breeds like the charolais and simmental emphasized traits like calving ease in AI bull selection, hence they way the results look in the table. Larry agrees with this analysis. If you have any questions I suggest calling Larry up. He is a very nice guy and easy to talk to about breeding programs. Lastly, a good performance recording system should include data from random matings on commerical cows. this does two things. It lets each bull have an equal opputunity to show his genetic potential and how well they perform in a comerical environment; the whole point of perforance data in the first place. Mark > In an attempt to compare apples to > apples in relation to different > beef breeds, I took the most > recent breed average EPDs and > adjusted them based on the 2003 > Across Breed EPD adjustments. > I compared Angus, Red Angus, > Hereford, Limousin, Simmental, > Charolais, and Gelbvieh since > these are the most popular breeds > in my area of the northern corn > belt. > When I evaluated the adjusted > numbers they didn't look right. > For example, the average Angus > sire has a 1.6 pound lighter birth > weight, 13.1 pound heavier > yearling weight, and 12.7 more > pounds of milk than the average > Red Angus sire. This surprised me > since Red Angus, as a breed, has > REQUIRED performance testing since > the inception of their breed > registry. > Several of the other breed > comparisons also look incorrect. > For example the average Angus > sires milk EPD is 2.2 pounds > heavier than the average > Simmentals. I DON'T BELIEVE THIS. > I found on the Gelbvieh website > that the American Gelbvieh Assn. > (AGA) was concerned with this data > also. As they pointed out, the > Across Breed EPDs, which were > developed by the Meat Animal > Research Center (MARC) were > developed based on "very > small sample sizes at a single > location." Consequently, the > AGA has developed their own Across > Breed EPDs for comparing Gelbvieh > to Angus and Red Angus which look > much more in line. > Does anyone else have any thoughts > on the MARC Across Breed EPD > accuracies? [email=mhickox@vcnet.com]mhickox@vcnet.com[/email] [/QUOTE]
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