Look, I honestly don't care --- I actually think it's laudable to put less commercially desirable meat to use, in the same way I think it's a good thing to use transglutaminase to stitch trim and offcuts into chicken nuggets --- but I can't find a single source that suggests culled dairy cows are a significant input to fast food. I can find direct statements from chains that preclude it. I've concluded that it's just not the case. We don't have to agree, but if you've got a source, I'll read it.
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