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• W2012125583 abstract "To investigate the effects of prostaglandin (PGF 2α) plus GnRH at different stages of the luteal phase 13 ewes received PGF 2α on Day 9 of the synchronized cycle, followed 36 h later by GnRH. This control regimen resulted in ovulation and normal corpus luteum (CL) function. In the next cycle, the ewes were treated simultaneously with PGF 2α and GnRH either on Day 4 (early, n = 7) or Day 9 (late, n = 6). Ovarian activity was monitored daily by ultrasonography, and blood samples were obtained to monitor hormonal patterns. Size of the largest follicle present when GnRH was administered was similar in all groups, but the preceding growth rate was greatest for the early group. In the 36 h after injection of PGF 2α, serum progesterone (P4) had declined to basal levels in the control cycles when GnRH was administered, but P4 concentrations were higher in the early group and were highest in the late group when the GnRH was administered with PGF 2α. The LH surges induced by GnRH were highest in the control cycles, and were lower in the 2 treated groups. In the early group, 6 of 7 ewes demonstrated ovulation within 48 h of GnRH, resulting in the formation of normal CL. In the late group, ovulation was delayed for about 5 d in 4 of 6 ewes, and subsequent luteal function was normal; no ovulation was detected in the other 2 ewes of this group, but the follicles became luteinized, resulting in a normal P4 profile in one and subnormal in the other. These results suggest that follicles present during the early luteal phase are capable of ovulating and forming fully functional CL in response to exogenous GnRH. In contrast, follicles present during the late luteal phase fail to ovulate in response to GnRH while P4 levels are high, even though the LH stimulus is adequate; however, these follicles persist and subsequently ovulate after P4 levels have decreased. Therefore, the endocrine milieu to which a follicle was exposed may be more important than its size in determining its ability to undergo ovulation and development into a normal CL." @default.
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• W2012125583 date "1997-11-01" @default.
• W2012125583 modified "2023-10-10" @default.
• W2012125583 title "Endocrine and ultrasound evaluation of the response to PGF 2α and GnRH given at different stages of the luteal phase in cyclic ewes" @default.
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• W2012125583 doi "https://doi.org/10.1016/s0093-691x(97)00342-7" @default.
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