Abstract
Luteolytic drugs are critical for managing reproductive success in dairy cows. Currently prostaglandin analogs are only approved for intramuscular injection. The utilization of a needle and syringe for administration of any drug can result in needle-stick injuries to workers. Furthermore, needle-free injection systems have been shown to eliminate transmission of bloodborne pathogens, such as anaplasmosis, in cattle. Data on the efficacy of needle-free injection systems and their application in an estrous synchronization protocol has not been reported. The objective of the present study was to evaluate the effectiveness of utilizing a needle-free injection system (Pulse NeedleFree Systems, Lenexa, KS) for the intramuscular delivery of cloprostenol (Estrumate®, Merck Animal Health, Madison, NJ) for the purpose of estrous synchronization in lactating dairy cows.
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