Provided are an orally-administrable agent for medical use which is to be used for preventing or treating animal coccidiosis and has a high safety with no side effect, an agent for foods or drinks for health use, a feed additive and a feed comprising the same. Also provided are a method for feeding animals (in particular, livestock and poultry) using the same and a method for controlling coccidiosis. By using a fermented product obtained by using a lactic acid bacterium and/or a fermented milk serum product obtained by using a propionic acid bacterium, a remedy or preventive for coccidiosis, an agent for health use and a feed additive can be provided.
