Least squares means ± SE of plasma progesterone concentrations (ng/mL) before (−0.5 h) and after (1, 2, 3, 4, 5, 6, and 7 h) offering feed to ewes submitted to the ad libitum diet (3.8% DM/kg BW; n = 12) or the restricted diet (2% DM/kg BW; n = 12) at the end of the fourth (A) and eighth (B) experimental week. For the fourth week: treatment (P < 0.001), time (P < 0.001), and treatment × time (P = 0.11). For the eighth week: treatment (P < 0.001), time (P < 0.001), and treatment × time (P = 0.31).