Aug 2 my dad brought two new pullets home from the feed store. One was sick. I treated both girls with Tetracycline that we got at the feed store. Took about a week and it cleared up. Yesterday I moved them from quarantine to the intro pen. Now I hear the second pullet rattling!! I'm going to put the tetracycline back in the water!! But y is she getting sick?! It had been hot and they were in a rabbit hutch...a big one but no "turnout." Could this just be from the conditions?