Prostaglandin F2? as ovulatory stimulus in dairy cows and buffaloes raised in the Amazon biome

This study evaluated the effect of a prostaglandin F2? (PGF) analogue as an ovulatory stimulus in dairy cows and buffaloes raised Amazon biome. To this end, three experiments were performed state Rondônia, located In Experiment 1, 22 lactating received 2 mg intramuscular (I.M.) estradiol benzoate (EB) on day 0 intravaginal progesterone-releasing device (CIDR) from to 9 protocol. On days 8 9, all given 500 ?g I.M. d-cloprostenol (PGF analogue). 10, divided into two groups receive PGF group, n = 8) or no treatment (CTL 14), respectively. 2, 16 crossbred (Holstein x Gir) EB CIDR insert 8. 7 8, d-cloprostenol. 8), 3, handled treated similarly although did not Single-point outcome variables analyzed using one-way analysis variance (ANOVA), while proportions with dichotomous outcomes chi-square test. there was difference (P 0.30) ovulation rate between groups, and, average, 68% ovulated. Moreover, affect interval 0.61) nor diameter preovulatory follicle 0.47). As for only one cow, PG ovulate. There differences CTL 0.69) moment ovulation, which occurred average 82 h after removal. Finally, ovulated earlier than those group (62.5 ± 5.8 94.5 13.5 h, respectively; P 0.05). Collectively, these results suggest that hastens cows, whereas observed buffaloes.