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University of Illinois4, Urbana 61801
Abstract
Fourteen anovulatory postpartum (38.0 ± 1.9 d) beef cows that ovulated after an injection of 250 µg gonadotropin releasing hormone (GnRH) in saline were used to examine the influence of indomethacin on luteal function. Beginning the d after GnRH, 6 cows were given intrauterine infusions of indomethacin for 14 d and the other eight cows received vehicle. After GnRH treatment, concentrations of progesterone in serum were elevated longer (P<.01) for indometacin treated cows than for vehicle-treated cows. At the same time prosta glandin metabolite (PGFM) concentrations were lower (P<.01) in indomethacin treated cows than in vehicle treated cows. In summary, indomethacin suppressed PGFM concentrations and enhanced function of corpora lutea induced in postpartum suckled beef cows.
1 The prostaglandin metabolite assay and the validation of this assay were conducted under the supervision of Drs. J. E. Hixon and P. G. Weston in their laboratory. The authors appreciate their generosity.
2 Gonadotropin releasing hormone was generously supplied by Dr. M. Brown (CEVA Laboratories). The crystalline 13, 14-dihydro-15-keto-prostaglandin F2
and the 13, 14-dihydro-15-keto-prostaglandin F2
antisera were generously supplied by Dr. K. T. Kirton (The Upjohn Co.). The progesterone antiserum wasgenerously supplied by Dr. O. D. Sherwood (Univ. of Illinois).
3 This research was conducted as part of regional research project, NC-113 "Methods for Improvement of Fertility of Cows Postpartum."
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