Figure 8
The 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 3 (black bars), Day 10 (light gray bars) and Day 16 (dark grey bars) after ovulation in cyclic Western White Face ewes. Ewes were treated for 10 d, from Day 4 after ovulation with silastic rubber implants (s.c) containing 10% progesterone (open circles; n = 6) and sham operated control ewes (black circles; n = 6). Letters (a-b) indicate differences between control ewes and ewes treated with progesterone releasing implants (P < 0.001) within respective intensive sampling period. Letters (x-y) indicate differences between the intensive blood sampling days (P < 0.001) for control ewes or ewes treated with progesterone releasing implants. [n = 6 (control), n = 6 (treatment)].