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OP said that calves drink from the chicken waterer

https://www.merckvetmanual.com/digestive-system/coccidiosis/coccidiosis-of-cattle Looks like there's dosing for calves, which would be a higher dose.

You can get corid too have it on hand, but I haven't had to use it with my chicks ever, yet.

I don't think it's coccidiosis, any lethargy? Not eating?

That looks like shed lining. Can you put the poo into water and see if it dyes the water red? Do they go outside?