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<blockquote data-quote="RafterD" data-source="post: 595854" data-attributes="member: 8951"><p><em>Generally speaking, I can understand how an extra low BW can take away from performance. Can you explain why a high IMF takes away from performance?</em></p></blockquote><p></p><p>Again, since I am not familiar with current hereford genetics and epd's so I may be speaking a little out of place. What I have seen with many but not all of the high IMF genetics in Angus is that certain lines tend to be pinched in their flank and generally lacking some capacity. For sure these traits can be equated to harder doing and less fertile cows. Those cows tend to produce barrel bodied calves that normally don't perform as well as some with more capacity. However, I am not aware of any research studies that have even tried to equate a relationship between high IMF and poor performance. One of the highest IMF ranked Angus bulls show the exact phenotypical defect in my opinion that I described above and consistently throws that same trait in his calves. However, after many thousands of registrations from nearly 1000 different herds, his calves weaning and yearling weights are still in the top 20% while the IMF epds of those calves continues to improve. This would tend to not support any correlation between IMF and performance at least in Angus.</p><p>[/QUOTE]</p>
[QUOTE="RafterD, post: 595854, member: 8951"] [i]Generally speaking, I can understand how an extra low BW can take away from performance. Can you explain why a high IMF takes away from performance?[/i][/quote] Again, since I am not familiar with current hereford genetics and epd's so I may be speaking a little out of place. What I have seen with many but not all of the high IMF genetics in Angus is that certain lines tend to be pinched in their flank and generally lacking some capacity. For sure these traits can be equated to harder doing and less fertile cows. Those cows tend to produce barrel bodied calves that normally don't perform as well as some with more capacity. However, I am not aware of any research studies that have even tried to equate a relationship between high IMF and poor performance. One of the highest IMF ranked Angus bulls show the exact phenotypical defect in my opinion that I described above and consistently throws that same trait in his calves. However, after many thousands of registrations from nearly 1000 different herds, his calves weaning and yearling weights are still in the top 20% while the IMF epds of those calves continues to improve. This would tend to not support any correlation between IMF and performance at least in Angus. [/QUOTE]
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