As best I can figure that one's in a box of books. If I ever get a chance to unpack them all, it's one of the books I'm looking for. I'll favorite your comment

As best I can figure that one's in a box of books. If I ever get a chance to unpack them all, it's one of the books I'm looking for. I'll favorite your comment here, and try to get back to you. :) This is not the reference, but something I just found on google books about the efficiency of dairy cows: https://www.google.com/books/edition/Farming_the_Business_Magazine/q_hEAAAAYAAJ?hl=en&gbpv=1&dq=dairy+cow+rocky+hillside+grass+efficient&pg=PA200&printsec=frontcover https://www.google.com/books/edition/Farming_the_Business_Ma... (responding to request for the reference for the dairy cow as an efficient converter of grass on rocky hillsides).