I could use some advice. I have 5 Silkies, one rooster and 4 hens. (He is a very sweet, non aggressive rooster). My birds have access to quality layer pellet 24/7, they get a hand full of scratch in the morning when they come out to free range (they can go back in if they want) and when they go up at night they get some fresh fruit/vegetables. My concern is that they seem thin. I treated them 30 days ago for mites and scrubbed and treated everything just to be safe but they look thin to me. They don’t act sick, feathers look good, they eat and lay. What am I not doing? How can I fatten them up? Is it cause it’s winter (their coop is heated)? Their poop is solid, no visible worms....any suggestions would be appreciated.