Here's the scoop: Henny-Penny is a partridge rock hen, around 4-5 years old. Her weight and feather quality are good. However, she has these arbitrary periods where she gets weak and her comb and wattles go pale. She has recovered within a few days previously, but this time it's more pronounced than before. I have her in the house for now with food and water, but I'm trying to decide what the next step should be. The flock has been on Tylan for mycoplasma issues. I don't think this is related to the mycoplasma. She doesn't sneeze at all, has not lost weight, and just otherwise doesn't seem to be exhibiting the mycoplasma symptoms. I have Duramycin and Sulmet that I can use if needed, she was already on the Tylan (not on it now that she's separated), and I was thinking I might try worming her. Any ideas? Seems like some sort of anemia or something, but caused by what?