Mostly I just like saying "medical-grade cattle".

I swear I don't make this stuff up:

When you study the way in this manner--having merit, the result comes of itself; having the result, merit does not arrive--you will secretly borrow the nostrils of the buddha ancestors and have them exhale; and taking up the hoof of a donkey you will have it imprint the seal of enlightenment. These are authentic examples of the ancient tradition.
"Body-and-Mind Study of the Way", by Dogen. And there are layers of meaning there that can be validated and explored through direct experience. Nutty.