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Farmer Smith has a block calving dairy herd. Your colleague has always visited the farm six weeks into the breeding season to synchronise any cows that haven't yet been inseminated, using a progesterone-based protocol. This year, as your colleague is away, you visit the farm and take with you packets of PRID-Delta (Ceva Animal Health). On seeing the packets of PRID-Delta, Farmer Smith looks horrified and explains that your colleague always uses CIDR (Zoetis). You reassure Farmer Smith that they contain the same active ingredient and he agrees to let you continue as long as you are sure that the cows will still get in calf just as well. As you drive back to the practice you wonder whether you should have been so confident.
In [dairy cattle] does the use of [PRID versus CIDR for oestrus synchronisation] result in a greater improvement in the [subsequent pregnancy rate from artificial insemination]?
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