Thank you guys for your insight! I think I will start feeding only a complete feed of some sort, whether it be an all flock and layer mix, and only feed scratch as a treat.
I've had poultry for roughly 11 years now. I've had a consistent feeding schedule for a long time, which consists of a layer feed mixed with scratch grains. In the winter I feed Purina Flock Raiser because of the extra protein (20%) and also because I have a mixed flock of chickens, ducks...