I had a strain of fowl called blueface hatch .I obtained from a old timer.They were strong beautiful fowl for a bit but I notice a few would get really pale headed and swell and soon die.As time went on it got worse.Carried one to the agricultural dept of the state .They cyrgentialky froze the fowl.Disected and when opened the liver was swollen and looked like a cooked appearance.Sad news had to cull them also

