We have a female twin we've had to bottle feed because Mom rejected at birth. We did not know she (the female twin) existed until a day later when she appeared with the rest of the herd. I assume she did not get colostrum. Twice now when we've tried to introduce calf starter, she got scours within a day or so. She is now 3 months old and needs to be weaned from the bottle I guess. She eats hay and grass, but can I put her immediately on stocker chow creep feed and skip calf starter altogether?