I have three hens who up until today have been healthy. One is white leghorn, the other two are red sex links. All were born in April of this year - only two have been laying up until last week when we got a third egg one morning, but nothing since. This morning one of the reds wasn't outside and I opened the enclosed portion and she was just sitting there, showing no signs of wanting to go outside. I closed it back up and got some bread to throw into the other girls and she did come out, although she seemed somewhat unsteady and moved slower. She did eat and drank when I changed the water, but continued to just stand by the waterer. Her comb is a lighter pink and seems to be shrinking?? Also, her wattles are much smaller than the other two girls. When she turned around I noticed that she had quite a bit of diarrhea on her rear - I've brought her in the house, rinsed her rear and checked her for lice/mites not finding any. She's currently inside with a heater on her. As a precaution I've added duramycin to the water for everyone - please any thoughts would be appreciated. I'm afraid I'm not holding up much hope for her, though.