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The Effect of Reduced GnRH Dose on Ovulation and Follicular Dynamics in Ovsynch Programme of Pure and Bunaji-Crossbred Cows

Theophilus A. Dare,Mohammed Mamman, Mohammed U. Kawu, Nuhu D. Chom,Collins Chimezie Udechukwu,Kelvin Olutimilehin Jolayemi

Tropical Animal Health and Production(2024)

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Abstract
Our objective was to compare the efficacy of reducing GnRH dose from 100 µg to 50 µg on the formation of ovulation and sizes of ovarian structures following Ovsynch in apparently healthy Bunaji and Friesian × Bunaji Cows. Thirty female multiparous-apparently-healthy adult [Bunaji (n = 15) and Friesian × Bunaji (n = 15)] breeds of cattle were used. Five cows each were allocated randomly to three groups [control; full dose (FD), and half dose (HD)]. Cows in the control group were treated with 2 ml normal saline while FD-group received 100 µg lecirelin on day 0, with 500 µg clorprostenol on day 7 and with 100 µg lecirelin two days later. Furthermore, HD-group received the same treatment as FD-cows but the dose of lecirelin was reduced to 50 µg at both times of GnRH administration. Ovarian structures were monitored by ultrasound with a 5-MHZ linear transrectal probe on days − 1 to 12. The ovarian responses of the various groups to first GnRH administration showed (0
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