Abstract
Summary
1. Two series of studies involving a total of 26 heifers and cows are reported. 2. Five heifers superovulated during the luteal phase of the estrual cycle produced 34 eggs none of which were fertilized. Five heifers treated during the follicular phase produced 43 eggs of which 74% had cleaved. All 6 heifers treated during the luteal phase, but none of the 6 follicular heifers, had pyometra. 3. Thirty and 40 g.e. of sheep FSH gave responses about equal but considerably greater than a 20 g.e. dose. 4. USG produced approximately twice as many corpora as HCG in the intravenous injection when they were used in combination with either sheep pituitary FSH or PMS. 5. A combination of PMS and HCG may produce satisfactory superovulation and should be studied further.
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