BOSS is Black Oil Sunflower seeds, you can get them at most feed stores in 50lb bags or they sell them for wild birds in grocery stores. People like to use them to give their chickens more fat and protein while they are molting...most people feed ones that are in the shell, but the shelled ones are higher in protein/fat by pound so check the numbers and compare to your feed. You can also use/supplement with a chicken feed that has a higher protein% than what you are using. Other popular high protein supplements are meat (mine like hamburger), cat or dog food, bugs like meal worms etc.
