Figure 2From: LH pulse frequency and the emergence and growth of ovarian antral follicular waves in the ewe during the luteal phase of the estrous cycleThe characteristics of pulsatile LH secretion (mean and basal serum LH concentrations and LH pulse amplitude and frequency; mean ± SEM) determined from serum samples collected every 12 min for 6 h on Day 7 (black bars), Day 9 (light gray bars) and Day 11 (dark grey bars) after ovulation in cyclic Western White Face ewes. Starting on Day 7 after ovulation, ewes were treated with GnRH (200 ng; IV; treatment group) or saline (control group) every hour for 96 h. Letters (a-b) indicate differences between control ewes and ewes treated with GnRH (P < 0.001) within the respective intensive sampling period. Letters (x-y) indicate differences between the days of intensive blood sampling (P < 0.001) for control ewes or ewes treated with GnRH. [n = 6 (control), n = 7 (treatment)].Back to article page