Sorry for your losses... I would like to suggest adding apple cider vinegar to your regular supplements for your chickens. It is amazing! I give it to my chickens, dogs, and myself! Apparently, ACV has properties that actually prevent coccidiosis, among many other ailments and diseases. I add 1 Tablespoon per gallon of water, but I've heard of others adding more. Make sure you get the ACV "with the mother", unpasteurized, not the regular apple cider vinegar in most stores. I use Bragg's, for example. There are some other threads on here where others have posted in more details the benefits of ACV for your chickens, so maybe you could find some more great information doing a search on ACV and coccidiosis. Hope that helps!