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EPD question
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<blockquote data-quote="simme" data-source="post: 1658335" data-attributes="member: 40418"><p>I assume these are all embryo calves born from recipient dams. Is that correct? If the EPD's are enhanced due to genomic testing, you should expect the genetic makeup (and EPD's) to vary as gizmom described. If there is no genomic testing, then EPD's could vary due to actual birthweights being measured and submitted. However, that would not be true for embryo calves as BW is partially determined by the recipient dam and therefore actual BW's are not used in the EPD calculations. I am left with the guess that genomic testing was done and changed the EPD's since I can't think of any other possibility. So, were samples submitted for enhanced EPD's?</p><p>Purpose of genomic testing is to increase accuracy of the EPD's due to a detailed look at the actual genetic random combinations that occurred as the chromosomes from the egg and sperm uniquely merged at conception. Without the genomic testing, the EPD's would be calculated as equal based on average of the sire and dam EPD's and then adjusted for each animal based on their actual measured performance. For instance, the WW EPD would vary based on the fact that all 5 did not wean at the exact same weight. If 3 were assisted at birth or heavier at birth, their CE and BW EPD's would be adjusted to reflect different valves based on measured or observed actual differences. EXCEPT if they were raised by recipient dams since the recip would be responsible for a portion of the measured difference.</p><p>Keep in mind that EPD's are EXPECTED or predicted differences. Not guaranteed. And not very accurate until data on lots of progeny is collected to improve the accuracy. Genomic testing gives you a headstart on that improvement in accuracy.</p><p>What breed are these? I believe there are differences in the calculation models used by different associations. Your breed association can perhaps offer a better explanation if you contact them.</p></blockquote><p></p>
[QUOTE="simme, post: 1658335, member: 40418"] I assume these are all embryo calves born from recipient dams. Is that correct? If the EPD's are enhanced due to genomic testing, you should expect the genetic makeup (and EPD's) to vary as gizmom described. If there is no genomic testing, then EPD's could vary due to actual birthweights being measured and submitted. However, that would not be true for embryo calves as BW is partially determined by the recipient dam and therefore actual BW's are not used in the EPD calculations. I am left with the guess that genomic testing was done and changed the EPD's since I can't think of any other possibility. So, were samples submitted for enhanced EPD's? Purpose of genomic testing is to increase accuracy of the EPD's due to a detailed look at the actual genetic random combinations that occurred as the chromosomes from the egg and sperm uniquely merged at conception. Without the genomic testing, the EPD's would be calculated as equal based on average of the sire and dam EPD's and then adjusted for each animal based on their actual measured performance. For instance, the WW EPD would vary based on the fact that all 5 did not wean at the exact same weight. If 3 were assisted at birth or heavier at birth, their CE and BW EPD's would be adjusted to reflect different valves based on measured or observed actual differences. EXCEPT if they were raised by recipient dams since the recip would be responsible for a portion of the measured difference. Keep in mind that EPD's are EXPECTED or predicted differences. Not guaranteed. And not very accurate until data on lots of progeny is collected to improve the accuracy. Genomic testing gives you a headstart on that improvement in accuracy. What breed are these? I believe there are differences in the calculation models used by different associations. Your breed association can perhaps offer a better explanation if you contact them. [/QUOTE]
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