Unlikely from grain left over from brewing as-is, there’s no animal product in it. However there have been cases where enterprising types have picked up various fodder and grain, then dosed it up with stuff like blood (yes, really) to bump up the protein value. Yeah, unlikely in 99% of cases, it’s the remainder that you end up reading about. A lot of the regulations since those sorts of events have been about ensuring that animals are not fed to animals.
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