Abstract

Results from Embryo Transfer (ET) procedures are highly variable. Reasons for variable results are not often clear. Differences in hormonal responses within the cow are most often blamed; yet, differences in drug potencies should be considered. This paper focuses on the drug potency portion of this issue and the effect that drug handling can have. A survey form was used to gather drug user opinions. In addition, drug manufacturers were consulted and product labels were reviewed. From this review, some conclusions were made concerning the methods of handling drugs and biologicals in ET operations. More variation in response to a drug or biological is due to the animal rather than the product used.

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