I have 2 ducks. Ducks are about 20 weeks old. They free range maybe about 3-4 hours/day. I don't keep feed out in the run because of mice but I give the ducks an equivalent of 15oz of Flock Raiser in their dish at night. They don't go inside their coop in the morning so I don't bother leaving food therer. Anyway, the they eat less than half of the 15oz of feed that I give them by the time morning comes along. Are they getting enough food?