2 weeks ago I rescued 8 hens from a battery farm. They are a little rough around the edges, with little feathers but otherwise happy and healthy. However when I let them out of the house (a converted shed) this morning, two of the hens didn't come out. I went back up a little later, to find that they were both stood with their neck feathers ruffled up, their tails facing downwards, yellowy/white diarrhoea and they did not react when I picked them up or touched them. The one that is the most ill also has a sort of lump on her chest? It is quite solid, is this normal?? This is unusual as, being ex-battery, they are still quite wary. One hen is worse than the other, and she looks drowsy and keeps closing her eyes, and her breathing sounds a little weezy. I have separated the two hens from the rest of the hens in two separate make-shift enclosures with plenty of food and water, with shade and grass/hay to nest in if needs be whilst I was at work. I am home now and they seem to not have improved, although the one who was not as bad is a little more active still. I had a quick google search this morning and I'm wondering if it could be that an egg can't be released (they haven't laid today) or some bacterium in that area?? Although I've had chickens before, they were not ex-battery and never had issues like this. I am worried that it could be contagious to the other hens, and I don't want to leave it until it is too late. I am very reluctant to call the vet as our vet is very expensive, so if it is something I can solve by myself I am eager to do so ASAP. Please help!!!