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HORMONE THERAPY FOR A.I.

by
Martin R. Dally
Super Sire, Ltd.

Prior to beginning hormone therapy, ewes should be in excellent condition - shorn if necessary, feet trimmed, and with immunization & worming programs up to date.

Day 0 Insert progesterone sponge or CIDR*
Day 14 Remove progesterone sponge 56 hours prior to A.I., or
Remove CIDR 52 hours prior to AI
Give intramuscular injection of PG 600 or PMS-G
Day 15 Take ewes off feed & water 20 hours prior to AI
Day 16 Begin A.I. based on time of sponge or CIDR removal
* Controlled Internal Drug Release

DETERMINING PMS-G LEVEL

There are several factors that determine the number of international units (iu) of PMS-G to administer:

  1. Season of year
  2. Age of ewes
  3. Body size
  4. Breed
  5. Desired prolificacy level

SEASON - Higher levels of PMS-G are given when out-of-season breeding is performed. Normally, the level is decreased as the breeding season advances. For example, Suffolk ewes being inseminated in July may need 750 iu, and the same ewe being inseminated in October may require only 300 iu.

AGE OF EWES - Maiden ewes are normally given 50 iu more than mature ewes.

BODY SIZE - As body weight increases the PMS-G level is normally increased. When weight differences within a group of ewes differ more than 50 pounds, the larger body size ewes may require higher levels of hormone.

BREED - Highly prolific breeds such as Finn Sheep and East Friesians require less PMS-G than breeds with low prolificacy.

DESIRED PROLIFICACY LEVEL - If multiple births (triplets and/or quads) are desired the PMS-G level can be increased.

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