| Abstract：The physiological characteristics of calves are complex, and the digestive system of calves is not fully developed, especially the functions of rumen, reticulum and valvular stomach are weak in the primary stage, which mainly rely on abomasum for digestion, and the immune system has not been fully established. The resistance to the external environment is weak. Among the factors affecting calf digestion, liquid feed is the main source of nutrition in the early stage of calves, and its quality and quantity have an important effect on the growth and health of calves. The composition and physical morphology of solid feed also significantly affect the digestion process of calves, and reasonable intake of solid feed is helpful to promote the development and function of rumen of calves. This paper discussed the digestive physiological characteristics of calves and its influencing factors, and put forward scientific feeding strategies from two aspects of liquid feed and solid feed, in order to provide reference for the scientific feeding of calves. |