Can you post your ingredient label.
Does your feed have probiotics and prebiotics in it? Could possibly be Asperigillus Niger which can be used as a probiotic.
Really? Mold used as a probiotic? Hmm. I never heard that. I looked up what that is and this is what I found:
Quote: Bizarre if that would be a probiotic. Anyway, I'd like to see the feed label, too.