Changes in ovarian function associated with circulating concentrations of estradiol prior to a GnRH-induced ovulation in beef cows

These studies were conducted to evaluate causes for differences in circulating concentrations of estradiol prior to a GnRH-induced ovulation. Beef cows were synchronized by an injection of GnRH on day -7 and an injection of PGF₂α on d 0. In Experiment 1, blood samples were collected every 3 h from PGF₂α on day 0 to hour 33 after PGF₂α and at slaughter (hour 36 to 42; n=10). Cows were assigned to treatment group based on circulating concentrations of E2: HighE2 vs LowE2. At slaughter, follicular fluid (FF) and granulosa cells were collected from the dominant follicle (DF).
Source: Domestic Animal Endocrinology - Category: Endocrinology Authors: Source Type: research