a type 2 civilization
These would be people with the ability to make black holes from light ? Own their own Dyson Swarm and so on ?
Seems very unlikely a type II civilization would need to slaughter actual animals to eat. It's practically a given they'd be able to manufacture meat that was indistinguishable from the real thing.
I was asking what would be the best way to butcher and collect the meat and most efficiently
Most efficiently ?
Grow your own "steaks" in a factory using advanced biochemistry or cloning technology or some technique. This avoids the slaughtering problem, the disposal of unwanted bits and the need to worry about breeding animals (always messy and terribly inefficient :-) ). Likewise milk.
And I'm trying hard to imagine a reason a completely alien species would not find human meat and milk actually dangerous to eat, never mind like it. And I'm failing.
So no butcher, just a large biochemical plant doing complex things with advanced techniques available to your average Type II civilization.