I read, that too much calcium in a chickens food, can negatively affect a chicken's health, if they keep on eating it for a long time. I couldn't find any unmedicated 5lb or 10lb chicken feed on the feed store, few days ago, so I decided to buy the 10lb. gamebird pellets. I read it from morning bird company website, that the presence of cocci care which has amprolium and ethopabate as an active ingredient, may degrade probiotics. I think that ethopabate might be the ingredient that degrades it, but I am not sure, so I want unmedicated chicken feed, while they are drinking probiotics. The calcium content in the gamebird pellets is 1.85-2.35%, while the broiler starter is 0.80-1.40% and triple duty feed have calcium levels of 1.1-1.60%. Layer pellets have calcium levels of 4.0-5.0% and egg producer crumbles have 3.6-4.35% calcium.