Developed due to customer interest, this formula was originally intended to control coccidia. In informal field trials on small flocks, we found it also demonstrated a reduction in roundworm eggs per gram. With potent ingredients, this formula should not be used on a chronic basis as a regular supplement. We instead recommend strategic use during certain times of the year when crowding and/or environmental stress is more likely, and only as directed on the label. Think of this as a preventative tool, best used when your flock needs it most.