three of our chickens died this last month. one of them was a rooster and they were all healthy and young. the rooster stopped crowing and had droopy wings. the hens never made noise and had their wings droop too.they wouldn't move around too. we sanitized the whole coop and run with bleach water and gave their feets baths in apple cider vinegar water because i read that diseases could be passed thru stuff on their feet. i would really appreciate any thoughts on what it might be.