Abstract
One-hundred and six beef cows were included in a study to determine if gonadot-ropin-releasing hormone (GnRH) administered via needleless implants would enhance calving rate like conventional GnRH administration. All cows were synchronized with the norgestomet and estradiol valerate estrus synchronization procedure and then randomly assigned to one of three groups: no GnRH, GnRH via conventional implants, and GnRH via needleless implants. GnRH was administered 30 hr after norgestomet implant removal. Although needleless implants were administered while cows were restrained, they may be administered remotely. GnRH administered by both methods equally enhanced (p < 0.05) calving rate and the needleless implant caused minimal response by the cows. Therefore, remote administration of GnRH may accomplish therapeutic efficacy and reduce the time, labor, stress, and risk of injury associated with providing conventional animal therapy.
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