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• W214217218 abstract "The influence of dietary CP on circulating LH and anterior pituitary and hypothalamic function was examined. In Exp. 1, 28 cows were randomly assigned to four treatment groups: adequate CP (ADQ; .96 kg/d) or deficient CP (DEF; .32 kg/d) beginning at 90, 60 and 30 d before parturition and continued at a 33% increase in feed consumption after parturition. Cows were bled at 15-min intervals for 8 h on d 20, 40 and 60 after parturition. Pituitaries were collected on d 62 to analyze GnRH receptor numbers and gonadotropin content. Frequency of pulsatile LH release increased (P < .05) from 20 to 60 d in ADQ cows. Basal and mean LH were not affected (P > .10) by CP restriction or by days after parturition. Crude protein did not affect pituitary GnRH receptors (P > .10), but it did affect pituitary LH content, FSH content and FSH concentration (P < .05). In Exp. 2, 28 cows were assigned to treatment groups as in Exp. 1. All cows were challenged with GnRH (.22 µg/kg BW) at 20, 40 and 60 d after parturition and were bled every 30 min for 6 h. Responsiveness to GnRH increased with increased time after parturition (P < .07). Deficient CP decreased GnRH-induced LH release (P < .05). In Exp. 3, 12 cows were randomly assigned to ADQ or DEF CP beginning 120 d before parturition. All cows received 1 mg estradiol-17β (E2) on d 19, 39 and 59 after parturition and were bled every 30 min for 14 h beginning 14 h following E2. Response to E2 was unaffected by CP restriction (P > .10), whereas time to E2-induced LH peak decreased as time after parturition increased in ADQ cows (P < .05). Results suggest that delayed return to estrus in CP-deficient postpartum beef cows might be due to reduced gonadotropin release from the anterior pituitary and decreased anterior pituitary responsiveness to GnRH." @default.
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• W214217218 date "1988-01-01" @default.
• W214217218 modified "2023-10-18" @default.
• W214217218 title "Postpartum Reproduction in Protein Restricted Beef Cows: Effect on the Hypothalamic-Pituitary-Ovarian Axis" @default.
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• W214217218 doi "https://doi.org/10.2527/jas1988.66123208x" @default.
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