AM PM Rule Fact Sheet

Transcript

1 PM Rule? - Do We Still Need the AM By Ryan Sterry For over a half century dairy producers bred from 0 to 4 hours after the onset of have been indoctrinated in the use of the estrus did have lower conception rates. 82. Dransfield et al., 1998. J. Dairy Sci. 81:1874 - AM - PM rule for AI of dairy cattle. Basically, the AM PM rule dictates that a - Hours onset Number of Conception cow should receive AI 12 hours after being Breedings Rate % estrus to AI observed in estrus. If a cow is seen in - 327 43.1 0 4 estrus in the AM she should receive AI that PM, and conversely cows seen in estrus in 50.9 4 - 8 735 the PM should receive AI the following 8 677 51.1 12 - morning. - 459 46.2 16 12 So how did the AM - PM rule come about? 20 28.1 317 - 16 Research in the 1940’s by George Trimberger at Nebraska demonstrated that 24 20 - 31.7 139 conception rates were greatest when cows 7 14.3 26 - 24 and were inseminated between the middle the end of estrus, but were still acceptable Secondly, our modern high producing dairy between 6 to 12 hours after estrus. Cows s behavior for a shorter cow exhibits estr ou bred immediately at the beginning of estrus - time than her ancestors. Work at UW had slightly lower conception rates, thus Madison shows that duration of estrus came about. the recommendation to wait declines with increasing milk production. At that point in history, AI in cattle was still in it’s infancy, and these findings gave producers the first recommendation on when to AI cattle. Strictly adhering to the AM PM rule - requires twice daily AI. In recent years, though, studies have indicated that once daily AI can result in the same fertility as twice daily AI. - Nebel et al., 1994. J. Dairy Sci. 77:3185 3191 Treatment - # of Cows 75 d Non return Rate % For more information, please contact: AM/PM rule 60.1 3659 60.6 Once Daily AI 3581 Ryan Sterry So what is the take home message? UW - Extension Polk County Today’s high producing dairy cow is more Agriculture Agent e w difficult to observe in estrus. If we kn 8600 - (715) 485 Why the discrepancy? There are a couple [email protected] exactly when she first exhibited estrus, possible reasons. First, the experiments PM - there would be some benefit to the AM by Trimberger did not include the number rule and twice daily AI. But the reality on of cows that is expected by today’s most farms is that we don’t know when a standards to draw conclusions. cow first exhibited estrus. There is more Observations using the HeatWatch System risk in breeding a cow too late than too at Virginia Tech do verify much of the early PM rule, which is why - early with the AM experiment, findings though. In their once daily AI have proven to be equally conception rates were greatest from 4 to successful. 12 hours after the onset of estrus. Cows Extension. © 2010 Board of Regents of the University of Wisconsin, doing business as the Division of Cooperative Extension of the Univer sit y of Wisconsin -

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