The first mare was at day 79 and the second mare would be 86 days when I tested them.. Neither have shown any heat signs since I bred them, one was stalled in the same barn as my stallion until I weaned her foal, and then she and the other mare were put out on pasture/lots not far from the stallion's turn out.. Guess I'll wait, cross my fingers and buy the 120s and try them..