NEEDLELESS IMPLANT DELIVERY OF GONADOTROPIN-RELEASING-HORMONE ENHANCES THE CALVING RATE OF BEEF-COWS SYNCHRONIZED WITH NORGESTOMET AND ESTRADIOL VALERATE
Dj. Kesler et Rj. Favero, NEEDLELESS IMPLANT DELIVERY OF GONADOTROPIN-RELEASING-HORMONE ENHANCES THE CALVING RATE OF BEEF-COWS SYNCHRONIZED WITH NORGESTOMET AND ESTRADIOL VALERATE, Drug development and industrial pharmacy, 23(6), 1997, pp. 607-610
One-hundred and six beef cows were included in a study to determine if
gonadotropin-releasing hormone (GnRH) administered via needleless imp
lants would enhance calving rate like conventional GnRH administration
. All cows were synchronized with the norgestomet and estradiol valera
te 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 im
plant removal. Although needleless implants were administered while co
ws were restrained, they may be administered remotely. GnRH administer
ed by both methods equally enhanced (p < 0.05) calving rate and the ne
edleless implant caused minimal response by the cows. Therefore, remot
e administration of GnRH may accomplish therapeutic efficacy and reduc
e the time, labor, stress, and risk of injury associated with providin
g conventional animal therapy.