In general, weanling piglets undergo various stresses, such as the sudden change of diet from milk to a cereal-based diet and separation from their mother and removal to a new pen environment, resulting in a lower feed intake, retardation of growth, and incidences of diarrhea. Thus, reducing stress is considered to improve the growth performance in weanling piglets and is valuable in pig production. Rice is one of the main cereals in the world, especially in Southeast Asia. In Japan, however, rice is not used for domestic animal feed because of its high cost. Nevertheless, recently, much attention has been focused on rice feeding, as it improves growth