I have 4 black sexlink hens. Only two appear to be laying and they take turns I think as I am only getting one or two eggs a day. I have only had them for 3 weeks. They were previously fed scratch only and free ranged. Now they get layer crumbles everyday, scrambled eggs a couple times a week. Oyster shells are constantly available. Healthy Grains scratch every day. Occasional meal worms. Some periodic treats as I have available. I checked vents and crops this afternoon and they all felt so thin I'm really worried about them. The first week I had them they got sick (I think one was sick when I got them as she died after only a week from respiratory complications. I have treated them with antibiotics Gone through first dose of worming even though I'm not seeing any in their poop. I see only normal poop. They seem to eat and drink actively. What can I do for them. They felt like skin and bones when I picked them up. Any suggestions?? Please help I am afraid they just need something.