I have this chicken who is at least two probably three years old and I live in Ontario Canada where the temperature outside right now is -20 with the wind chill and it has been so for a couple of days. I am keeping my chickens in with a heat lamp turned on to help with keeping them warm and I also have 25 birds. Yesterday, when I went out to bring more water for them I found one of my older birds(the one I mentioned) lying on the floor of the coop and not moving. I assumed she was just really cold, so I brought her in the house and gave her food and water, but this morning she still isn't moving much. I'm now thinking she might be egg bound so I checked her vent and it was covered in feces and smelling really bad, so I washed the area really well, but there is some matter on her vent that I can't get off and I don't want to hurt her pulling it. It smells bad and is yellow in colour. It actually looks like egg yolk. I am worried she has broke an egg and some is still inside. She is not interested in eating or drinking that I can see. She looked at it but wouldn't take any of it. I felt for an egg and I don't feel any bumps, but I'm not sure what to really feel for and I'm wondering if anyone knows what might be causing the odor…broken egg or maybe an infection.