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- W2024136161 abstract "A surge of LH during the follicular phase triggers multiple pathways, including progesterone and prostaglandin synthesis before culminating in ovulation. Progesterone has been shown to be involved in the ovulatory process in many species. In prepuberal gilts treated with PMSG/hCG the follicular progesterone level has been shown to increase sharply before ovulation. This study was conducted to investigate whether premature elevation of progesterone can accelerate the ovulatory process in Large White PMSG/hCG-treated prepuberal gilts. Fifty-four Large White gilts were treated with 1000 IU, i.m. PMSG to stimulate follicular growth, followed 72 h later by 500 IU, i.m. hCG to induce ovulation. Gilts in the treatment group (n = 27) were given progesterone intermuscularly at 24 and 36 h after hCG. Ovaries were exteriorized to observe ovulation points during laparotomy under general anesthesia at 38 to 50 h after hCG. Ovulation in both groups commenced by 40.05 h after hCG and was completed by 47.71 h in the control group and by 42.87 h after hCG in the treated group. Progesterone shortened (P < 0.01) ovulation time by 4.84 h and the time required (P < 0.01) for the median proportion of follicles to ovulate (40.7 vs 43.5 h after hCG). Progesterone also increased (P < 0.01) the plasma progesterone concentration without altering follicular progesterone concentration." @default.
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- W2024136161 date "1998-08-01" @default.
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- W2024136161 title "Premature elevation of progesterone shortens duration of ovulation in PMSG/hCG-treated prepuberal gilts" @default.
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- W2024136161 doi "https://doi.org/10.1016/s0093-691x(98)00150-2" @default.
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