I have 16 chickens from 10wks old to around a yr old... I've nevr had any problems with raisin chickens for the years I've been raisin them.. i bought a few RIR last week and now I've notice from time to time they have runny pooh and I've also seen traces/specs of blood in their pooh.. what's causing my chickens to be sick and what can i do to keep them alive????