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• W2022139895 abstract "Two experiments were conducted on 30 Barbarine ewes (Exp 1) and 40 local Tunisian goats (Exp 2) in seasonal anoestrus (May). In both experiments, half of the females received 20 mg of progesterone intramuscularly just before male introduction (day 0). Blood samples were taken at 4 h intervals from the time of introduction of the ram, for the determination of the time of the preovulatory LH surge in response to the 'ram effect' (Exp 1) and once a day from days 1 to 8 to determine plasmatic progesterone concentrations (Exp 1, Exp 2). The ovulation rate was determined by coelioscopy at days 4 and 9, and oestrus behaviour was monitored twice daily in each experiment. In the ewe, progesterone delayed the time of the preovulatory LH surge (58.8 +/- 10.1 vs 20.5 +/- 10.7 h, P < 0.001), and suppressed hypofunctional corpora lutea (0/15 vs 7/14, P < 0.001). The induced ovulation rate was not significantly different between control and treated females (1.50 +/- 0.52 vs 1.26 +/- 0.46 respectively). Only 1 female in the control group and 2 in the treated group showed oestrus behaviour at the induced ovulation. Suppression of short cycles by progesterone treatment allowed synchronization of oestrus between days 17 and 20 compared to days 14 and 23 in the control group (P < 0.001). In the goat, all induced ovulations in the control group were followed by a short cycle. In the progesterone-treated group, 3 out of 20 goats developed abnormal induced corpora lutea (P < 0.001). First oestrus occurred between days 1 and 8 in control group and between days 2 and 3 in treated goats. Treatment with progesterone increased the percentage of females showing oestrus at induced ovulation (100 vs 35%, P < 0.001). The ovulation rate at first oestrus was increased in treated goats (1.85 vs 1.35, P < 0.001). In conclusion, 20 mg progesterone administered at day 0 is efficient at preventing the occurrence of short ovarian cycles. After ovulation induced by the male effect, the percentage of females in oestrus, and the induced ovulation rate are increased by progesterone treatment." @default.
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• W2022139895 title "Effet de la progestérone sur le taux d'ovulation et la durée du cycle ovarien induits par effet mâle chez la brebis Barbarine et la chèvre locale tunisienne" @default.
• W2022139895 doi "https://doi.org/10.1051/rnd:19950406" @default.
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