I live in town and the costs 21% feed is just crazy, $25 a 40lb bag of Purina flock raiser, the only non-medicated feed I can find. Im raising some jumbo X and they are almost 7 weeks old. Can I add some plain grains like corn, oats and maybe even some alfalfa?perhaps some sunflower seeds or legumes? get some chicken scraps and are on bermuda grass.