i've noticed in my 1+ yr old RIR's a few are having episodes of diareah. this seems to happen when we have a stretch of high heat and humidity. I was thinking that maybe it was due to drinking more water during these periods? also have a new batch or RIR's which have integrated very well, but in the flurry of this introduction i'm sure the older ones got their hands on some grower pellets. you know how hard it is to seperate foods; layer pellets for the older hens, grower for the younger ones.