Hi, I just lost a chicken this moring. It had a round lump that looked like it had hair sticking out on one side of the neck. She looked weak and I pick her up, and she was having trouble breathing, then I put her back down and was going to come in and ask you for advise as to what it could be and she died. Her head went down and she was gone. Was that her crop? was it blocked? And what type of gravel do you use? just from the ground? or can you purchase it? Please advise. ( the lump was round and about the size of a nickel and she had trouble and was gasping for air, I noticed her yesterday she was smaller then the rest of them, and just looked small in conparsen to the rest and was just laying down all the time.