@EggSighted4Life
Yes a calorie is a calorie is a calorie and both carbs and protein contain 4 calories/gram but it takes less time for a chicken to break down carbs in there system to excess the calories than with proteins so since proteins take longer to digest they are in there system longer.
Offering sunflower seeds to your chickens now and then is fine but keep in mind that whole sunflower seeds can deplete proteins and there is a lot of "by-pass" material, meaning a lot of whats in a whole sunflower seed passes right through them.
Flax seed isn't all that great, too much can make...
A lot of people will have different thoughts on feed and what to feed.
I raise mostly true heritage (non-hatchery) breeds along with some egg production fowl (sex-links of my own breeding and crossing's form heritage fowl), and I wouldn't spend my money on a poultry feed that's less than 20%...