While grinding up some deer for hamburger I have to occasionally take the grinder apart and pull the tendons and silver out of the cutting area. Since I'm doing this outside I just toss the pieces out to the chickens and they really enjoy the added treat. So it got me to wondering if it'd do any harm to keep the leftover parts and pieces that we don't eat (flanks, liver, heart, etc..) and grind that up for chicken feed. Of course it'd be just like the scratch in that it's a treat and not more than 5-10% of their overall daily intake. Thoughts?