It's for an adult fowl.
Chicks in the next farm down where they breed meat fowl have constant access to feed.
I know that the guy there calculates at 170 grams per fowl when adult. They are not the same breed as yours.
If they have no access to any other feed you are looking at 170 grams ( 6 ounces) per day as a very rough figure. There are lots of caveats, including temperature, keeping conditions, weight of fowl.