Luteal function in mares following administration of oxytocin, cloprostenol or saline on Day 0, 1 or 2 post-ovulation  Gary J. Nie, Kristina E. Johnson, James G.W. Wenzel, Timothy D. Braden  Theriogenology  Volume 60, Issue 6, Pages 1119-1125 (October 2003) DOI: 10.1016/S0093-691X(03)00112-2

Fig. 1 Mean (±S.E.M.) progesterone concentration on individual post-ovulatory days for control cycles and all treatments administered on Day 0. *P<0.054, **P<0.002, ***P<0.01, the asterisks indicate differences in progesterone concentration among treatment groups on that day post-ovulation. Theriogenology 2003 60, 1119-1125DOI: (10.1016/S0093-691X(03)00112-2)

Fig. 2 Mean (±S.E.M.) progesterone concentration on individual post-ovulatory days for control cycles and all treatments administered on Day 1. *P<0.054, **P<0.002, ***P<0.01, the asterisks indicate differences in progesterone concentration among treatment groups on that day post-ovulation. Theriogenology 2003 60, 1119-1125DOI: (10.1016/S0093-691X(03)00112-2)

Fig. 3 Mean (±S.E.M.) progesterone concentration on individual post-ovulatory days for control cycles and all treatments administered on Day 2. *P<0.054, **P<0.002, ***P<0.01, the asterisks indicate differences in progesterone concentration among treatment groups on that day post-ovulation. Theriogenology 2003 60, 1119-1125DOI: (10.1016/S0093-691X(03)00112-2)