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- W2110982022 abstract "The role of insulin in mediating pituitary responses to nutrition was investigated in 30 mature Border Leicester X Merino ewes. The ewes were infused with saline (n = 15) or bovine insulin at 0.4 IU/kg/d (n = 15) for 72 h during the luteal phase of the estrous cycle The ewes were housed in individual pens and were fed, ad libitum, a diet of low quality straw. Their estrous cycles were synchronized with prostaglandin (PG), with infusions given over Days 9 to 11 of the estrous cycle. A further injection of PG was given at the end of the infusion, and the subsequent ovulation rate was determined by endoscopy 12 d later. Blood samples were collected every 4 h from Day 8 until 52 h after the final PG injection for the determination of plasma FSH, insulin and glucose concentrations. On Day 11 blood samples were also taken every 20 min for 24 h for the determination of LH pulse characteristics. During the infusion of insulin, its concentration rose 4-fold and remained elevated until the end of infusion, when it fell to pretreatment concentrations. Glucose concentrations were significantly reduced during the insulin infusion and rose to pretreatment concentrations after infusion. In control ewes glucose and insulin concentrations did not change. Ovulation rate of treated ewes was not affected by the insulin (1.9 ± 0.07) compared with that of control ewes (2.0 ± 0.10). Neither were FSH concentrations affected by treatment with insulin, although a significant interaction of treatment with time was observed in the 36 h after infusion. The pre-ovulatory decline in FSH concentrations was delayed by about 8 h in the insulin treated ewes. The mean (± SEM) LH pulse frequency (4.3 ± 0.4 vs 1.8 ± 0.3 pulses per 24 h) and the mean (± SEM) concentration of LH (0.48 ± 0.04 vs 0.32 ± 0.03 ng/ml) were both significantly reduced by insulin. These results indicate that insulin-induced hypoglycaemia inhibits LH secretion in cyclic ewes and implicates insulin as a mediator of normal hypothalamo-pituitary function." @default.
- W2110982022 created "2016-06-24" @default.
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- W2110982022 creator A5040350495 @default.
- W2110982022 date "1997-02-01" @default.
- W2110982022 modified "2023-10-09" @default.
- W2110982022 title "The effect of the infusion of insulin during the luteal phase of the estrous cycle on the ovulation rate and on plasma concentrations of LH, FSH and glucose in ewes" @default.
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- W2110982022 doi "https://doi.org/10.1016/s0093-691x(97)00031-9" @default.
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