Avitestin is a mixture of butyric acid and short- and medium-chain fatty acids. It reduces the pH of drinking water and thus reduces the risk of infection with gram-positive bacteria. High-quality medium-chain fatty acids exert their effects far into the small intestine and promote gut health by promoting the growth of the body's own probiotics. The butyric acid it contains is active in the intestine, promotes the growth of villi and therefore improves immune defense. In addition, the acids ensure that the drinking water stays fresh longer and have a positive effect on the metabolism of pigeons.