Sorry I'm breeding both of them.You're breeding one, but not the other? Is that correct? I would figure their hay at 5 lbs per day until the bred doe hits about 3 to 4 months along, then kick it up to 6 lbs/day.
Non bred doe - 185 days(adjust for months with 31 days) X 5 lbs/day = 925 lbs. Divide that by what your bales weigh to get the number of bales you will need.
Bred doe - 92 days X 5 lbs/day = 460 lbs. 61 days X 6 lbs/day = 366 lbs. 460 + 366 = 826 lbs of hay. Again - divide by the weight of your bales to get the number of bales.
ETA: I would also increase the number of bales I bought by maybe 20 to 25 to allow for possible bad bales, hay accidentally getting wet, kids, eating more if your area is very cold, etc.