on three pounds.' We don't actually quantify it so precisely in humans, but we know in humans that
some people can eat a little and they can put on quite a bit of weight and some people can eat a lot
and hardly put on any weight. So it's a biological phenomenon."
Rod Hill says ranchers can use selective breeding to get the same growth with less feed. But he
says not to focus too much on one thing, like reducing fat.
"Less-efficient animals are slightly fatter, and more-efficient animals are slightly leaner. So we
wouldn't want to just go after efficiency and then forget about the body composition. So, we wouldn't
want animals to become too lean, so that might reduce marbling in the product, especially in the
quality cuts where the profit is.