I am very worried about one of my warren hens. She is an ex battery bird and we have had her for about 2 years. It has been very cold and frosty the last 3 days, and the hen seems unwell. She stands with feathers puffed up and seems very miserable. I have examined her and can find nothing to account for this. her eyes are clear and bright and everything seems normal. She is a reasonable weight. Her comb, however is a little pale. Although she stands hunched up, when I go outside, with feed, she runs straight up and eats her share! I have been boosting her calorie intake and serving warm food in the mornings and before they go to roost. This seems to perk her up for a while. I have examined the hen house for red spider mite, and looked over them for lice. No sign of either. I have lost two other hens, both ex battery, in the last few months, and hen people round here have told me that ex battery hens are pretty much spent because of their lifestyle, and are not bred to be long lived. However, that said, I want to do my best for her. I already give a tonic, and, in the bitterest of weather, a small tot of navy rum. Don't know if it keeps te cold out but they seem to like it. If anyone can suggest what the trouble might be, or anything to help, I would be most grateful.