It has been a while since I have had any cows AI'd. I have 2 heifers that I want to AI and when I asked the Vet if he wanted to use Synchro Mate, he said he would use CIDR's instead. Since I was not familiar with the product, I contacted a Vet supply company to try to find out something about it. The answer I got was that it is a product out of New Zealand that is not yet approved by FDA for legal importation but that it is "around". I would appreciate any information that anyone can provide concerning CIDR's. It seems that I recall Jason making a referance to them on one of these boards. Any information would be appreciated. Thanks'