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Induction of some oestrous phenomena was achieved. Treatment with 25 mg PGF-2 alpha cuased mucous discharge, within 48-72 h after injection, which lasted for 4-5 days. Rectal palpation indicated rapid regression of the CL, and in 9 treatments of 6 buffaloes serum progesterone levels declined from 1.76 +/- 0.01 (s.d.) ng/ml before treatment to less than 0.25 ng/ml within 24 h after injection. Concentrations increased at about Day 11 and reached a peak of 1.78 +/- 0.62 ng/ml on Day 18.50 +/- 2.45.

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