AETA Practice Tip: Placing CIDR

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Published on: April 10, 2018

By Tyler Dohlman (Iowa State University)

For most of us practitioners, CIDR have become a staple in our reproductive programs and will continue to be as long as they are effective. Whether they are used on donors or recipients or in artificial insemination protocols, they allow us to manipulate the estrous cycle for various needs. However, everyone has had a time when the number of CIDR put in does not match the number found when it comes time to retrieve them. This scenario can happen in a few instances: (1) we did not actually place a CIDR in the first place or (2) they fell out or were pulled out prior. CIDR, in general, should not come out sporadically, and if they do, it is usually because of poor or haphazard placement. Therefore, the latter scenario in which they are getting pulled out is more likely. In our experience, heifers are the problem child group. Heifers, curious in nature, and especially Holsteins, are all too accustomed to making our lives much more difficult by helping us pull CIDR out before our protocol says.

To mitigate this issue, I was taught at some point in my career to clip the blue attached string short. However, I usually forget to grab scissors or a knife to do such modifications to the CIDR at placement. Conveniently enough, I was taught a different modification to hide that all-too-enticing blue string. The modification is simple and easy, and rarely, if ever, do we lose CIDR in those curious Holstein heifers anymore.

If you have ever looked at a CIDR, there is a hole the same size as the blue string on the base of the CIDR. All you have to do is flip the blue string in the hole before placing the CIDR in the applicator. This hides the blue string and conveniently creates a looped handle for removal. In our hands, this modification has worked on our farms with heifers. Clients are less adaptive to this new method because they cannot see the blue string to confirm the CIDR is still in place, but the persuasive nature in me explains that if a CIDR were to fall out prior to protocol, it could prevent an ET or AI pregnancy. Caution: we commonly do this in cows also, and sometimes the blue string handle is in just a little too far and is out of reach. Then trans-rectal palpation guidance is needed to push the CIDR closure to the vulvar opening for retrieval.

On that note, I hope this helps someone and that you never lose another CIDR.

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