I'm using non-gmo grains feed grade limestone, fertrel nutribalancer and kelp minerals as suggested in Joel Salatin's Pasturied Poultry Profits book. I failed to get my corn ground at the mill and had to get a grinder to grind the cracked corn at least until they are a few weeks old. Then I open my bag of roasted non gmo soybeans that I thought would be ground and saw that they were not. Kinda new to this so I need to be clear with instructions when I order grains.