If it's gape worm don't you deworm? "Gapeworms are best prevented by administering a wormer at fifteen to thirty day intervals or including a drug at low levels continuously beginning fifteen days after birds are placed in the infected pens. One drug that is effective for eliminating gapeworms is fenbendazole, however, its use is not presently approved for use in birds by the Food and Drug Administration." From http://msucares.com/poultry/diseases/disparas.htm Instead of fenbendazole I would use my piperazine . Powder you put in the water for several hours for the whole crew.