I have a mixed breed hen, that I thought had a respiratory infection as I could hear a rattle when she was breathing and I know one of my others had it about a year back. Apart from the rattle noise she was fine, looked normal, eating and drinking. Anyway I got antibiotics from vet as did with the last one. Just finished the weeks course and she still has a rattle when she breaths but still no other signs of illness. I've not long got her so could it be she just breaths like this or should I take her to the vet?? Thanks