I am tired of feeding the squirrels. I let the chickens free-range during the day but leave the run door open all day so they can get to the fod and water. The squirrels help themselves to the food. I think I want to start keeping the run closed and just feed the chickens and the AM and PM instead of constantly having food out. My question is how much food should a chicken eat per day? And are they okay without food access during the day?