I don’t think the requiernments for mammalian muscles cells are that different from each other. It might be optimized for a specific animal, but I’m pretty sure it will still work in general or it would only take very small adjustments to make it work for a different mammal.
The other question is where would you find livable cells from a cow or whatever that you wanted to cultivate
Yeah, you’d need a live or very recently deceased cow. But it should be easy enough to obtain some samples before or during regular slaughter. And once this method is viable and widespread enough there will probably “biopsy cows” that just get pricked for cell samples all day.