Pre‐ovulatory Patterns of Estradiol‐17ß in Relation to the Superovulatory Response in Cows and Heifers

Ultrasonographic Observation of Individual Follicular Development in Japanese Black Cows Superovulated with FSH.

“…It was recognized that the profile of progesterone during superovulatory treatment was similar to those in normal cattle synchronized with PG at mid-luteal phase, and the pattern of estradiol-17β involved peak concentrations during estrus, and followed by a sharp decrease. In this study, changes in the mean concentrations of progesterone and estradiol-17β agreed with the previous results [19][20][21]. Also, the estradiol-17β levels tended to increase gradually in accordance with follicle development from medium to large size.…”

“…It was concluded that ovulatory follicles could not be differed from non-ovulatory follicles during the superovulatory treatment by the method of ultrasonography. The plasma progesterone and estradiol-17β profiles were investigated in detail in superovulated cows [19][20][21]. It was recognized that the profile of progesterone during superovulatory treatment was similar to those in normal cattle synchronized with PG at mid-luteal phase, and the pattern of estradiol-17β involved peak concentrations during estrus, and followed by a sharp decrease.…”