Constancy of Interval Between Luteinizing Hormone Release and Ovulation in the Ewe

Relationship between the onset of oestrus, the preovulatory surge in luteinizing hormone and ovulation following oestrous synchronization and superovulation of farmed red deer (Cervus elaphus)

“…Retrospective analysis of the interval between the LH peak and ovulation indicate a more variable relationship than that occurring between the onset of oestrus and ovulation. Although these data are not statistically significant, they do conflict with those observed for sheep where there is a remarkable constancy in the interval from the preovulatory LH surge to ovulation (Cumming et al, 1973). This may, however, reflect less precision in measuring the actual timing of follicular rupture ( + 4 h) in red deer hinds.…”

“…This may, however, reflect less precision in measuring the actual timing of follicular rupture ( + 4 h) in red deer hinds. In general, the interval from the LH peak to ovulation is similar, if not a little shorter, than that occurring in sheep (Cumming et al, 1973), cattle (Henricks et al, 1970;Schams et al, 1977) and goats (Mori & Kano, 1984).…”

Seasonal Variation in the Timing of Estrous Behavior LH Surge and Ovulation Following the Treatment with Progesterone and PMSG in Suffolk Ewes.

“…It has been reported in ewes that the LH surge occurs about 6 h after the beginning of estrus, and the latency from the LH surge to the ovulation averages 21-26 h [17,18]. In this study, the interval from the onset of estrus to the LH peak in both treated and untreated ewes during breeding season agreed with a previous report [18].…”

Morphometric Estimation of the Numbers of Granulosa Cells in Preovulatory Follicles of the Ewe

“…Cumming et al (1971) have shown that ovulation normally occurs approximately 24 h after the onset of the preovulatory LH surge in the ewe. Hence it is likely that the follicles studied here were collected within :::: 4 -10 h of their expected time of ovulation.…”