Thank you Seaweed - interesting informative links. My attention was drawn to this paragraph:
Because EVERYTHING is different with feed grade pet foods/feed grade ingredients, adding some fresh ‘food’ (real food not feed) to your pet’s diet daily is a great and simple thing to do. Not everyone can afford to provide their pet with minimally processed food as the sole diet, but we all can add some.
This is something that I have believed in for a long time. Although I have used this before, I will repeat it here for convenience: Why Fresh ‘Human Food’ is so Important for Dogs (Rodney Habib).
Lots of pet owners are on a tight budget and need to feed economically but fresh food toppers a few times a week may be affordable. There is a lot of information online about those protein sources that have higher amounts of taurine, chicken and muscle meat being two.