by: Dr. G.F. Kennedy

In our experience over the years, we have the best results by leaving the CIDR’s in the ewe for 10-12 days which is no longer than the normal lifespan on the corpus luteum. The packages insert and Pfizer literature indicates that the trial work they have done indicates that a five day insertion period is adequate. This trial data was done much closer to the equator and with hair sheep. We have done many ewes using the 10-12 day insertion period in combination with the PG 600. The PG 600 is given when the CIDR’s are removed and will help to stimulate follicle development.

Using the product will require the purchase of an applicator and some protective gloves. When inserting the CIDR into the ewe’s vaginal tract, use obstetrical lubricant.

Program Date Procedure:

Day 1: Insert the CIDR using lubricant and the Eazi-Breed Cidr applicator. Wear protective gloves when handling the inserts.

Day 6-12: Pull the CIDR and give an injection of PG 600.

Day 7-14: The ewe should exhibit heat 1-3 days following the CIDR removal.

The ability of your rams will be the limiting factor to the success of your program, be sure to have them semen checked in advance. Make sure to have plenty of ram power available. If using single sire matings, you should consider removing only three to five CIDR’s per day. Every ram will be different; some have very limited ability to breed multiple ewes, while others can breed large numbers of ewes. Introduce the first ram 24 hours after CIDR removal.

PG 600 shelf life has now been extended to three years. In order for this to be accomplished the company now requires refrigeration which extends the shelf life. Most producers intend to use the product immediately so refrigeration isn’t an issue. We will be shipping the product ground without ice. I would refrigerate on arrival but not absolutely necessary unless you intend to keep product over two years from manufacturing. Portions that have not been used after dilution may be frozen and thawed for use at a later date.


About Ask-a-Vet Sheep

Veterinary services, procedures, biologicals, and drugs mentioned in this publication represent the personal opinions and clinical observations of the contributing author. They are in no way intended to be interpreted as recommendations without the consent of the producer’s own practicing Veterinarian. We strongly urge that producers establish a patient-client-veterinarian relationship that allows extra-label use when there are no drugs approved for treatment or if approved drugs are not effective. This procedure allows veterinarians to go beyond label directions when “prudent use” is necessary. The limited availability of drugs and biologics in this country is a major factor in restricting the growth of the sheep industry and allowing producers to compete in the world market place.
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