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Cattle Boards
Breeding / Calving Issues
Are we too dependent on EPD's?
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<blockquote data-quote="Ranchin&#039; Randy" data-source="post: 1727524" data-attributes="member: 42411"><p>If you take the EPD's at face value, there are definitely some discrepancies. Which why the accuracy and PC (potential change) is also important to take into account.</p><p></p><p>Take the following two heifers as an example:</p><p></p><p><strong><u>Heifer 1</u></strong></p><table style='width: 100%'><tr><th>Wean</th><th>Year</th></tr></table> <table style='width: 100%'><tr><td>73.0</td><td>111.3</td></tr></table> <table style='width: 100%'><tr><td>0.44 accuracy %</td><td>0.45 accuracy %</td></tr></table> <table style='width: 100%'><tr><td>±9.13 PC (63.87-82.13)</td><td>±14.14 PC (97.16 -125.44)</td></tr></table><p></p><p><strong><u>Hefier 2</u></strong></p><table style='width: 100%'><tr><th>Wean</th><th>Year</th></tr></table> <table style='width: 100%'><tr><td>80.0</td><td>122.2</td></tr></table> <table style='width: 100%'><tr><td>0.51 accuracy %</td><td>0.51 accuracy %</td></tr></table> <table style='width: 100%'><tr><td>±7.99 PC (72.01-87.99)</td><td>±12.59 PC (109.61-134.79)</td></tr></table><p></p><p><strong>Reported Weaning Weights:</strong></p><p>Heifer 1 - 463</p><p>Heifer 2 - 601</p><p>* Even at the most drastic PC, we should see a ~25lb difference on average. Here we see a 138lb difference.</p><p></p><p><strong>Reported Yearling Weights:</strong></p><p>Heifer 1 - 748</p><p>Heifer 2 - 842</p><p>* Even at the most drastic PC, we should see a ~ 37.63lb difference on average. Here we see a 94lb difference.</p><p></p><p></p><p>Does that mean the EPD's are wrong? Is this an outlier of the expected average? Did the producer do something different to these two heifers (same farm)? I am not sure, but things like this I feel push people away from using EPD's.</p></blockquote><p></p>
[QUOTE="Ranchin' Randy, post: 1727524, member: 42411"] If you take the EPD's at face value, there are definitely some discrepancies. Which why the accuracy and PC (potential change) is also important to take into account. Take the following two heifers as an example: [B][U]Heifer 1[/U][/B] [TABLE] [TR] [TH]Wean[/TH] [TH]Year[/TH] [/TR] [/TABLE] [TABLE] [TR] [TD]73.0[/TD] [TD]111.3[/TD] [/TR] [/TABLE] [TABLE] [TR] [TD]0.44 accuracy %[/TD] [TD]0.45 accuracy %[/TD] [/TR] [/TABLE] [TABLE] [TR] [TD]±9.13 PC (63.87-82.13)[/TD] [TD]±14.14 PC (97.16 -125.44)[/TD] [/TR] [/TABLE] [B][U]Hefier 2[/U][/B] [TABLE] [TR] [TH]Wean[/TH] [TH]Year[/TH] [/TR] [/TABLE] [TABLE] [TR] [TD]80.0[/TD] [TD]122.2[/TD] [/TR] [/TABLE] [TABLE] [TR] [TD]0.51 accuracy %[/TD] [TD]0.51 accuracy %[/TD] [/TR] [/TABLE] [TABLE] [TR] [TD]±7.99 PC (72.01-87.99)[/TD] [TD]±12.59 PC (109.61-134.79)[/TD] [/TR] [/TABLE] [B]Reported Weaning Weights:[/B] Heifer 1 - 463 Heifer 2 - 601 * Even at the most drastic PC, we should see a ~25lb difference on average. Here we see a 138lb difference. [B]Reported Yearling Weights:[/B] Heifer 1 - 748 Heifer 2 - 842 * Even at the most drastic PC, we should see a ~ 37.63lb difference on average. Here we see a 94lb difference. Does that mean the EPD's are wrong? Is this an outlier of the expected average? Did the producer do something different to these two heifers (same farm)? I am not sure, but things like this I feel push people away from using EPD's. [/QUOTE]
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