I substituted calves liver for chicken liver in one batch, but have had little luck getting the cats to eat it. They just don't like the strong flavor. I don't want our calico to lose any more weight, so I suspect I'll be tossing some cat food. I have some ground rabbit waiting in the freezer for an upcoming batch of kitty chow. I make up enough to feed them for about 2 weeks and freeze it in small containers to thaw out for daily feedings.
I started out with poultry purchased in the grocery store, supplemented with vitamins and minerals from a local vitamin store (for people). My latest batch is based on whole ground up chicken and chicken hearts and livers ordered from a rabbit farm in western PA. This way they get the calcium from bones directly rather than through bonemeal supplements. If I lived closer to my parents in SW Michigan, I could probably get some great game scraps through Dad's locker. Perhaps this summer I'll get a chance to do that.
Wow! I will be sure to check out that website.