My six chickens are about 10 months old and have been laying happily since I'd say May. The last couple weeks we've been getting either five eggs or four a day as opposed to six. I'm noticing one chicken especially today is tired and will stand around with eyes shut. She'll walk around and scratch a little but not with the pep the others have. I think she's the one that's not laying and I'm getting concerned and worried about her. I give them a good layer everyday with new water each day. They do get manna pro harvest delight as a treat in the evening. They are free range so thy get a ton of bugs and worms and whatever other goodies they find everyday. So I'm not sure what to do at this point. Any advice would be greatly appreciated!