Ostriches can grow to 260-300 pounds. Ostriches in the egg-laying period can be fed with 44% corn, 5% wheat, 12% soybean meal, 5% bran, 7% imported fishmeal, 20% alfalfa grass meal, 0.4% salt, 2% calcium phosphate, 0.6% shellac, 3.3% bone meal, 0.25% methionine, 0.25% lysine, 0.1% multivitamin, 0.1% trace elements, which is good for ostrich egg production and weight gain.