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Luteal Function in Gilts after Prostaglandin F₂^{1, 2,}

Oklahoma Agricultural Experiment Station, Stillwater 74074

Abstract

Twenty 9-month-old crossbred gilts were randomly allotted to one of four treatment groups to examine the effects of prostaglandin F₂ (PGF₂) on estrous cycle length, plasma progesterone, estradiol and LH. Two groups were injected four times intramuscularly at 12-hr intervals starting on day 4 of the estrous cycle with either a total of 80 mg PGF₂ or saline. The other two groups were treated similarly except treatments were started on day 12 of the estrous cycle. Estrous cycle length was not altered by PGF₂ treatment starting on day 4; but when treatment was initiated on day 12, gilts had shorter estrous cycles than controls (17.2 ± .2 vs 18.6 ± .7 days, respectively, P<.10). The lengths of the estrous cycles after PGF₂ given on days 12 and 13 were also shorter than the estrous cycles prior to treatment in the same gilts (P<.01). Plasma progesterone was not altered by treatment with PGF₂ on days 4 and 5, but progesterone was reduced (P<.025) in gilts treated with PGF₂ on days 12 and 13. Plasma estradiol was significantly elevated (P<.025) in gilts treated on days 12 and 13 compared to control gilts, but plasma LH was not significantly altered by either PGF₂ treatment. It was concluded that PGF₂ given on days 12 and 13 of the estrous cycle can hasten luteal regression in gilts.

¹ Journal Article 2871 of the Agriculture Experiment Station, Oklahoma State University, Stillwater, Oklahoma. This research was conducted in cooperation with the U.S.D.rt., Agricultural Research Service, Southern Region.

² We thank Dr. James Lauderdale (Upjohn Company) for his advice and for supplying the prostaglandin F₂ Tham salt. We also thank Dr. G. D. Niswender (Colorado State University) for the progesterone-6β-BSA and porcine LH antibodies, Dr. S. A. Tillson (Alza Research) for the supply of antibody to the conjugate 1,3,5(10)-estratriene-3, 17β-diol, 17β-succinyl-BSA, Dr. L. E. Reichert, Jr., (Emory University) for the supply of porcine LH for iodination, and the NIAMD for the supply of LH standard (NIH-LS-S₁₈).

³ Department of Animal Sciences and Industry, Oklahoma State University, Stillwater, 74074.

⁴ Present address: Department of Animal Science, University of Nebraska, Lincoln, 68500.