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<blockquote data-quote="DOC HARRIS" data-source="post: 481382" data-attributes="member: 1683"><p>rocket2222-</p><p></p><p>Your observations in the last few months are very astute - and correct! This situation relating to IMF readings and Weaning and Yearling weights is an interesting and educational study. Any correlation between %IMF and Ultrasound Ribeye Area of a sire's progeny, inasmuch as they are antagonistic traits in comparison, of necessity has an influence in marbling scores and POUNDS of weaning growth and POUNDS of yearling growth of a sire's progeny. The convoluted involvement in which producers and breeders find themselves when 'tweaking' seedstock EPD's for optimal results in matings is a "prime" example of why 'single trait' selection choices will NOT work satisfactorily - because the 'non-considered' genes DO have positive influences and at times supercede and cancel desired traits and characteristics. It is a matter of selecting the 'lesser of evils" in making final decisions.</p><p></p><p>Tough, tough job!</p><p></p><p>That is what "Antagonistic" conditions are! They are in resistance and opposition to <em><strong>other</strong></em> desirable traits, such as WW and YW EPD's. Another example are the traits Very Low Birthweights and Very High Milk Production resulting in loss of body musculature, and in particular - HINDQUARTERS! Result - FUNNEL BUTTS!</p><p></p><p>Understanding the WAYS and FUNCTIONINGS of EPD's is mandatory for a breeder to really KNOW what his herd is doing and WHY it is doing it!</p><p></p><p>I think that is the main reason why some breeders don't "- - - - believe in EPD's!" They don't understand what they are really all about, or how they work. EPD's are critrical and important, but you had better know what you are doing, and what the consequences of making a mistake can be.</p><p></p><p>The next big consideration is why smaller cows make you more PROFIT! It refers right back to your original supposition in this thread, rockett2222!</p><p></p><p>Who is going to "Bell the Cat?"</p><p></p><p>DOC HARRIS</p></blockquote><p></p>
[QUOTE="DOC HARRIS, post: 481382, member: 1683"] rocket2222- Your observations in the last few months are very astute - and correct! This situation relating to IMF readings and Weaning and Yearling weights is an interesting and educational study. Any correlation between %IMF and Ultrasound Ribeye Area of a sire's progeny, inasmuch as they are antagonistic traits in comparison, of necessity has an influence in marbling scores and POUNDS of weaning growth and POUNDS of yearling growth of a sire's progeny. The convoluted involvement in which producers and breeders find themselves when 'tweaking' seedstock EPD's for optimal results in matings is a "prime" example of why 'single trait' selection choices will NOT work satisfactorily - because the 'non-considered' genes DO have positive influences and at times supercede and cancel desired traits and characteristics. It is a matter of selecting the 'lesser of evils" in making final decisions. Tough, tough job! That is what "Antagonistic" conditions are! They are in resistance and opposition to [i][b]other[/b][/i] desirable traits, such as WW and YW EPD's. Another example are the traits Very Low Birthweights and Very High Milk Production resulting in loss of body musculature, and in particular - HINDQUARTERS! Result - FUNNEL BUTTS! Understanding the WAYS and FUNCTIONINGS of EPD's is mandatory for a breeder to really KNOW what his herd is doing and WHY it is doing it! I think that is the main reason why some breeders don't "- - - - believe in EPD's!" They don't understand what they are really all about, or how they work. EPD's are critrical and important, but you had better know what you are doing, and what the consequences of making a mistake can be. The next big consideration is why smaller cows make you more PROFIT! It refers right back to your original supposition in this thread, rockett2222! Who is going to "Bell the Cat?" DOC HARRIS [/QUOTE]
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