OMG!!!!!! you actually feed the hearts and tongues to the dogs?????? In my book unless it is somehow tainted it's HUMAN food!!!!!!! heart is a good meat to use in soups and tongue is a sandwich meat.We have a small local Abattoir (slaughterhouse) where we take our beef cows. I got to know the folks and they started asking me if I wanted hearts and tongues that people don't take, for our dogs (Great Pyrenees = eat a lot). Then they asked if we wanted to go through the awful barrels for bones, meat scraps and suet. Boy do the chickens love that! I laugh when I read all of the posts about meal worms for protein because it seems like so much work. But then I have roughly 100 girls. That would take a lot of meal worms. It's a lot easier if you can find a source like this that is just going to go to waist anyway. I can stop in and get 50 to 100 pounds of goodies and put them in the freezer and use it as needed. In the winter we don't even freeze it, just through it out in the chicken yard and let the girls work on it for a month or so. It's amazing what is available for free.