Spartrix (Harker's)An effective and safe canker tablet containing 10mg of Carnidazole. Can be used during breeding and race season. Spartrix is in a handy tablet form so pigeons can be treated individually ensuring all birds receive the required dose Whenever canker is seen, all birds should be treated Adult birds should be treated before breeding and again before racing season Young birds should be treated with half a tablet at weaning or before flying out.