It is important pigeons maintain a natural defence from opportunistic attack. Fatigued or stressed birds can be more prone to a weakening of the immune system and therefore attack from organisms such as protozoa and trichomaniasis (Canker) in vulnerable areas such as the crop. It is suggested that Cankex is used regularly, particularly after a dehydrating, hot race day, or at times of stress such as the breeding and moulting seasons. Dosage: Add 5ml per 2 litres of drinking water for 24-72 hours, then use at least once a month