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Reaching genetic potential
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<blockquote data-quote="MikeC" data-source="post: 154414" data-attributes="member: 1604"><p>Correct Dun, but every cow/calf/bull is compared against every other animal within the database when EPD's are computed and contemporary groups are extremely important in those calculations.</p><p></p><p>Environmental factors and management types (creep or no creep) are calculated in also.</p><p></p><p>However, the results are no more accurate than the data submitted.</p><p></p><p>Changes in the model are made periodically to reflect new research data.</p><p> Example: A couple of years ago the Charolais YW numbers went up approx. 20 points and the Milk numbers dropped about 8 points, across the board. None of the animals acually changed YW or Milk propensities, it was simply found that YW growth has less to do with Milking ability genetics than was previously thought. </p><p>i.e. the model was corrected to show the antagonistic relationship.</p><p></p><p>The biggest problem to me at this point in calculating EPD's is that when a "Commercial" cattleman buys a young bull, the EPD's are only a "Pedigree Estimate" or "Interim" EPD's, which are subject to change drastically and the new owner will not know of these changes because he doesn't turn in data to the respective Association. </p><p></p><p>In other words, a young bull that you bought this year that you thought had a LOW EPD for BW could actually be much higher than the incomplete sale data printed in the catalog due to the genetic difference possible. Same would go for other EPD traits.</p><p></p><p>This is why so many commercial cattlemen AI to "Proven" bulls and reduce their chances for a "Trainwreck".</p><p></p><p>EPD's are just another tool in the box.</p><p></p><p>There is no way to "Skew" the numbers on a proven bull with hundreds of offspring in the database, but a young bull could be off by several digits.</p></blockquote><p></p>
[QUOTE="MikeC, post: 154414, member: 1604"] Correct Dun, but every cow/calf/bull is compared against every other animal within the database when EPD's are computed and contemporary groups are extremely important in those calculations. Environmental factors and management types (creep or no creep) are calculated in also. However, the results are no more accurate than the data submitted. Changes in the model are made periodically to reflect new research data. Example: A couple of years ago the Charolais YW numbers went up approx. 20 points and the Milk numbers dropped about 8 points, across the board. None of the animals acually changed YW or Milk propensities, it was simply found that YW growth has less to do with Milking ability genetics than was previously thought. i.e. the model was corrected to show the antagonistic relationship. The biggest problem to me at this point in calculating EPD's is that when a "Commercial" cattleman buys a young bull, the EPD's are only a "Pedigree Estimate" or "Interim" EPD's, which are subject to change drastically and the new owner will not know of these changes because he doesn't turn in data to the respective Association. In other words, a young bull that you bought this year that you thought had a LOW EPD for BW could actually be much higher than the incomplete sale data printed in the catalog due to the genetic difference possible. Same would go for other EPD traits. This is why so many commercial cattlemen AI to "Proven" bulls and reduce their chances for a "Trainwreck". EPD's are just another tool in the box. There is no way to "Skew" the numbers on a proven bull with hundreds of offspring in the database, but a young bull could be off by several digits. [/QUOTE]
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