The nutritional value of distiller's grains is related to the raw materials for brewing. As far as grain wine is concerned, soluble carbohydrates in grain are fermented into alcohol and extracted, so other nutrients left in distiller's grains, such as crude protein and crude fat; The content of crude fiber and ash increased correspondingly, but the digestibility changed little. In all kinds of dry matter of distiller's grains, the crude protein content is about 8-25%, the digestibility is above 6.0 MJ/kg, and it is rich in B vitamins, and calcium and phosphorus are unbalanced. Feeding distiller's grains is easy to cause constipation, so you should pay attention to the following points: