Fifty-two normally cyclic cows received 1 800～2000 iu of PMSG on day 9 and 3 ml of15-Methyl-PGF_(2α)48 hrs.later.Twenty-three of them were injected with 2 ml ofanti-PMSG serum at the onset of estrus(Group I)and the other twenty-nine cows werenot(Group Ⅱ).In comparison with cows in Group Ⅱ,cows in Group Ⅰ showed a shorteroestrus period(26 vs 48 hrs.)and lower concentration of blood serum estradiol-17β on day4 after AI(53 vs 128pg/ml).Anti-PMSG treated cows showed a higher ovulation rate andfewer unovulated l...
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