hard to tell,

cos the pet food industry uses 'left overs' etc frm food processing for human consumption.

heres an example.

i just bought a few wet food pouch frm supermarket for street kitty.

this is prodiet tuna & chicken

ópen up, look @ this...

is like tuna in orange juice...!!

why do you need to put orange colour in cat food??
cat dont giv a damn.
so the hooman will like it??

this kinda mentality is frm the past.
now alot ppl cashing on 'health' food.  no this no that la.
n still prodiet ppl wana do this.
add fake colour..
they can save some money by omitting the colour ingredient.

I see. Probably mix like you said.

BTW, a kitten run across the street to my house. Looks really hungry because he ate the cat food that I left in front of the house for a neighbourhood cat. His whisker has been cut all of them likely to prevent him from finding a way home.

It is bad times nowadays since someone in high position said it is OK to throw cat away.