OK so we decided to get some fertile eggs to place under a broody hen. The guy gave us a mix of 4 duck eggs and 6 chicken eggs. He told us the gestation period is the same for both. Does this sound correct? And is it ok to mix a brood of chooks and ducks? I read that duck eggs take longer to hatch. If so, the chicken eggs will hatch a week before the ducks. Will she remain sitting or leave them to die? If that is the case can we finish the incubation process manually?