Best Days to Breed for Fresh or Fresh Chilled Semen: Days 2-4
Best Day to Breed for Frozen Semen: Day 3
Expected Whelping Day: Day 63 +/- 1 day
Maximal Cornification of Vagina: Days -6 (variable) to 6 (not variable)     
LH Surge is Day -2
Progesterone on Day -2 is 8-12 nmol/L (2.5-3.8 ng/ml)
Ovulation is Day 0
Progesterone on Day 0 is 12-24 nmol/L (3.8-7.5 ng/ml)