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<blockquote data-quote="SPH" data-source="post: 1514880" data-attributes="member: 20580"><p>What were the actual birth weights on those bulls? Not sure how your breed does EPD calculations but with Hereford EPDs the actual BW and how that BW compares to the rest of your calf crop can really change an EPD even before you factor in genomic DNA testing. We have a young cow with 3 calves all sired by our herd bull who has been a consistent calving ease bull for us and her first 2 calves were a 75 lb heifer and 75 lb bull then shocked us with a 104 lb bull calf this year. The crappy part of that is that bull calf will probably be one of the top calves at weaning this fall and be nothing more than a really nice looking steer. We'll never keep a bull with that kind of birth weight intact but it sure would be interesting what a DNA profile on him would do to his genomic EPDs if he was registered since his full brother last year has a CE EPD of 9.2 and BW 0.8 which put him in the top 10% or better for those EPDs. It's one of those things where you trust your knowledge of your cattle over what any EPD or genomics may say along with some common sense that EPDs aren't 100% accurate or a fail proof way of making comparisons either.</p><p></p><p>One of the best bulls we ever raised and kept semen on was an 89 lb birth weight but even though his sire and the sire of his dam both very proven calving ease bulls his EPD took a hit because he was the 3rd highest BW of that calf crop even though the 2 higher BW calves wound up having a much lower BW EPD. We used him cleanup on some heifers before we sold him to another breeder and between them and us never had a problem with calving ease despite what the EPDs say.</p></blockquote><p></p>
[QUOTE="SPH, post: 1514880, member: 20580"] What were the actual birth weights on those bulls? Not sure how your breed does EPD calculations but with Hereford EPDs the actual BW and how that BW compares to the rest of your calf crop can really change an EPD even before you factor in genomic DNA testing. We have a young cow with 3 calves all sired by our herd bull who has been a consistent calving ease bull for us and her first 2 calves were a 75 lb heifer and 75 lb bull then shocked us with a 104 lb bull calf this year. The crappy part of that is that bull calf will probably be one of the top calves at weaning this fall and be nothing more than a really nice looking steer. We'll never keep a bull with that kind of birth weight intact but it sure would be interesting what a DNA profile on him would do to his genomic EPDs if he was registered since his full brother last year has a CE EPD of 9.2 and BW 0.8 which put him in the top 10% or better for those EPDs. It's one of those things where you trust your knowledge of your cattle over what any EPD or genomics may say along with some common sense that EPDs aren't 100% accurate or a fail proof way of making comparisons either. One of the best bulls we ever raised and kept semen on was an 89 lb birth weight but even though his sire and the sire of his dam both very proven calving ease bulls his EPD took a hit because he was the 3rd highest BW of that calf crop even though the 2 higher BW calves wound up having a much lower BW EPD. We used him cleanup on some heifers before we sold him to another breeder and between them and us never had a problem with calving ease despite what the EPDs say. [/QUOTE]
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