Other bills allow to select which stockpile to consider when checking for the "do until" condition, but not butcher's one.
(http://i65.tinypic.com/2nr2ae1.jpg)
Further, it is show "counting: meat"; is it possible to count anything else, like leather?
Bump.
Butchering doesn't have defined products, so we'd need a whole new system to define what product you're looking for, how much, and which stockpile it would go in.
E.g. Maybe you want to butcher until you have X thrumbo leather, or Y hare meat, or Z elephant tusks, etc. Or butcher mechanoids for components. Or anything that can come from modding.