Regarding the cuts of meat, I’ve noticed more so with commercial raw diets that some are excessively high in fat. Either the protein and fat are the same value or in a couple cases I’ve seen the fat exceed the protein. What that says to me is fattier cuts of meat may be being used to cut cost.
Regarding amino acid profile. The digestibility of the diet will tell you if the amino acids are being metabolized correctly. Larger companies, Purina included record data on digestibility during feeding trials and can often tell you the overall digestibility on each ingredient. For example Hills reports their corn as being 99% digestible overall.
