Disease control agent, feed composition, feed, cashew nut shell liquid, a thermotreated cashew nut shell, anacardic acid, cardanol, cardol, or anacardic acid and cardanol, and, weight gain for livestock
The present invention provides a controlling agent for a disease caused by a Clostridium bacterium, comprising a cashew nut shell liquid, a heat-treated cashew nut shell liquid, anacardic acid, cardanol, or anacardic acid and cardanol.