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<blockquote data-quote="Lucky_P" data-source="post: 1170408" data-attributes="member: 12607"><p>Ron, </p><p>Need to also look at accuracies. At 0.31(112Y's acc. on CED epd), it's pretty low. </p><p>Granted, looking at what's behind him, it oughta be pretty believable - but until he gets some progeny reported, it's a guesstimate.</p><p> </p><p>Bettis, the bull I've been using on heifers, has 0.91 acc on his 18.5 CED epd - pretty reliable, at least on paper. But, his full sib, Singletary (whom I have used - but not on heifers) has CED of 3.9 with .85 acc - still pretty reliable). That's a pretty wide spread for two full-sibs. </p><p>Why? - I'd say if you went solely on averages of parental performance, they'd be similar - but just like my two sons are very different from one another, so may the performance of progeny of two similarly-bred bulls differ. </p><p></p><p>EPDs are a 'population-based' estimate - with reported data from the bull/cow, their own offspring, closely-related individuals, and the population as a whole, influencing changes in the numbers. Too much math for me to wrap my feeble mind around.</p><p>Additionally, as the 'E' stands for 'expected'...you don't always get what you expect.</p></blockquote><p></p>
[QUOTE="Lucky_P, post: 1170408, member: 12607"] Ron, Need to also look at accuracies. At 0.31(112Y's acc. on CED epd), it's pretty low. Granted, looking at what's behind him, it oughta be pretty believable - but until he gets some progeny reported, it's a guesstimate. Bettis, the bull I've been using on heifers, has 0.91 acc on his 18.5 CED epd - pretty reliable, at least on paper. But, his full sib, Singletary (whom I have used - but not on heifers) has CED of 3.9 with .85 acc - still pretty reliable). That's a pretty wide spread for two full-sibs. Why? - I'd say if you went solely on averages of parental performance, they'd be similar - but just like my two sons are very different from one another, so may the performance of progeny of two similarly-bred bulls differ. EPDs are a 'population-based' estimate - with reported data from the bull/cow, their own offspring, closely-related individuals, and the population as a whole, influencing changes in the numbers. Too much math for me to wrap my feeble mind around. Additionally, as the 'E' stands for 'expected'...you don't always get what you expect. [/QUOTE]
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