LUTEAL FUNCTION IN GILTS AFTER PROSTAGLANDIN
F 2 ~ I ,2
D. M. Hallford 3 , R. P. Wettemann3 , E. J. Turman3and I. T. Omtvedt 4
Oklahoma Agricultural E x p e r i m e n t Station, Stilhoater 74074
Twenty 9-month-old crossbred gilts were randomly allotted to one of four treatment groups to examine the effects of prostaglandin F2~ (PGF2a) 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
F 2 ~ I ,2
D. M. Hallford 3 , R. P. Wettemann3 , E. J. Turman3and I. T. Omtvedt 4
Oklahoma Agricultural E x p e r i m e n t Station, Stilhoater 74074
Twenty 9-month-old crossbred gilts were randomly allotted to one of four treatment groups to examine the effects of prostaglandin F2~ (PGF2a) 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
