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- W291230362 abstract "Lactation in dairy cows is associated with increased GH concentrations and high milk production. This study was begun to examine hypothalamic and pituitary sensitivity to GH secretory stimuli. In experiment 1, cows (nonlactating, NL; days 30 and 90 postpartum, pp) fitted with jugular cannulas were administered GRF (n = 10; .08 or .4 ug/kg BW) on successive days or were administered a loading dose of glucose and infused with the same .56 mmol/kg dose for 20 min. In experiment 2, cows (n = 5; days 5 and 30 pp) were infused with saline or SRIF (.2 or .8 mg/kg). After 15 min of infusion, cows were injected with GRF (.1 ug/kg). Plasma was collected and assayed for GH by radioimmunoassay. Data were analyzed by analysis of variance. In experiment 1, glucose had no effect on GH in NL or day 90 cows but increased GH in day 30 cows (p < .05). GRF stimulated GH in all groups but no dose effect was seen at day 30. There was a greater GRF effect at day 90 than in NL cows (p < .05). In experiment 2, GRF had a greater effect at day 30 than day 5 (p < .05).more » SRIF at both doses slightly blocked GRF actions at day 30 but only the .8 dose blocked GRF actions at day 5 (p < .05). Greater pulses of SRIF with greater sensitivity to suppression by glucose in early lactation could explain the glucose and GRF data. Increased pituitary sensitivity to SRIF but lower SRIF levels may be present in late lactation.« less" @default.
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- W291230362 date "1986-03-01" @default.
- W291230362 modified "2023-09-28" @default.
- W291230362 title "Effects of growth hormone-releasing factor (GRF), somatostatin (SRIF) and glucose on growth hormone (GH) secretion in lactating dairy cows" @default.
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