I do know that a chicken sheds a bit of intestinal lining occasionally, but then there is coccidiosis which causes diarrhea with blood. Do your chickens seem to be feeling ok? You could watch to see if you see diarrhea with blood and watch how chickens are feeling or if you choose to treat Corid or Amprolium is a product used to treat cocciciosis. 9.5cc (approx. 2 tsp) to 1 gallon of water for 5 to 7 days. If it were me and chickens seem to be acting normally, eating normally watch for a day or so but if see any decline I would start with the meds.