Harkanker is a soluble powder for the treatment and prevention of canker in pigeons.To prevent a build up and spread of infection in adult birds. Harkanker Soluble should be given at the beginning and the end of the racing season. Also, if administered 3 weeks prior to breeding, risk of infection being passed to the young birds is eliminated. Because of low immunity, young birds are particularly susceptible to canker. By medicating drinking water with Harkanker Soluble for one week in every four, outbreaks at such a crucial stage of life will be prevented. Harkanker Soluble is available in 5 x 4g sachets (sufficient for 50 birds). Contains Ronidazole 400mg.