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HORMONE THERAPY FOR A.I.
by Martin R. Dally Super Sire, Ltd. UPDATED FOR FALL 2017
Prior to beginning hormone therapy, ewes should be in excellent condition - shorn if necessary, feet trimmed, and with immunization and worming programs up to date.
DETERMINING PMS-G LEVEL
There are several factors that determine the number of international units (iu) of PMS-G to administer:
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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