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Induction of first postpartum ovulation by GnRH analogue in suckled dairy cows

HAJURKA J, CHOMA J
Veterinarni Medicina 43, 1998, 169-172

The aim of the experiment was to assess the ovarian response to synthetic Gonadotropin-releasing hormone (GnRH) treatment in suckled dairy cows. Experimental cows (n = 10) were treated i.m. with 25 and 50 mu g GnRH analogue (Ferring - Leciva, Praha, Czech Republic) on days 12 and 13 post partum. Five control cows were left untreated. The ovarian response to hormonal treatment was evaluated daily by rectal palpation of the ovaries. From days 4 to 8 (second treatment = day 0) serum progesterone concentrations (P4


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