1. 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 (October 2003)
DOI: /S X(03)

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  , DOI: ( /S X(03) )

3. 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  , DOI: ( /S X(03) )

4. 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  , DOI: ( /S X(03) )