Since CIDRs (Controlled Internal Drug Release progesterone implant used to synchronize ewes through the use of progesterone) have been legalized for sheep, some breeders are using them to synchronize ewes to tighten up lambing seasons and also to try to bring anestrous ewes into heat. This will make it more difficult to determine whether fall-born animals are naturally fall lambing, or whether it was assisted via the use of CDIRs. K Bar K Farm has decided NOT to use CIDRs except for artificial insemination- that way the sheep can express their natural fertility patterns which will help us continue to select for out of season breeding, and also for ewes that naturally conceive during the first breeding cycle. 

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