The Harkers 4 In 1 Spot On is a unique addition to the Harkers range, designed to treat and prevent coccidiosis, canker, worms, and external parasites such as lice and mites in racing pigeons. This easy-to-administer spot-on treatment comes with a handy dropper. To use, separate the feathers between the shoulder blades of each bird and apply 0.1ml of solution directly to the skin. For optimal results, breeding stock should be treated before pairing and again before racing. Young birds should be treated after weaning, but do not treat birds weighing less than 400g. Treatment can be repeated every 4-6 weeks or as needed. A 5ml bottle is sufficient to treat 50 birds. Contains Diclazuril 25.0mg/ml, Ronidazole 200.0mg/ml, and Ivermectin 350ug/ml.