Figure 5

Serum concentrations (ng/mL) of P4 in synchronized ewes. Five ewes were assigned to each time period and synchronized with Lutalyse (7.5 mg I.M.) injections two times, 4 h apart. Time periods included 3 h and 24 h post estrus and days 4, 10, and 15 of the estrous cycle. For clarity, serum concentrations of P4 are only shown from onset of estrus (d 1) to d 15. Data are means ± S.E. (n = 5 ewes/time period).