Summary. Dairy heifers with normal oestrous cycles were treated with progestagen for 15 to 18 days beginning at the 15th day of the cycle. Daily oral doses of 0·25 to 8 mg of melengestrol acetate (6α-methyl-6-dehydro-16-methylene-17-acetoxyprogesterone: mga) inhibited oestrus and ovulation in all he...
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