Not a hundred percent sure, because I've never accurately recorded the amount mine eat, but that seems about right, especially if that's all you are feeding them. Also, do you feed free-choice, or not? A lot of people seem to think that free choice is ideal, but in my experience a lot gets wasted on the ground that way, and wild birds are drawn to the food, etc. I personally feed a restricted amount twice daily, and supplement with fruit, greens, BSF larvae, azolla, food scraps, etc. to keep the cost of purchased feed down and give them a fresher, healthier diet. If you are interested in using less purchased feed you might also do a little research into the Korean Natural Farming methods of chicken husbandry for some ideas and pointers.