Crude fodder includes hay and straw feeds. Common features are low nutrient content and high cellulose content. Due to the different characteristics of digestive organisms of various livestock and poultry, the demand for roughage varies greatly. The demand of ruminants for roughage The cattle, goats and camels in ruminant livestock have four different functions of stomach: rumen, honeycomb, abomasum, and repetitive stomach, and have high digestion and utilization rate for roughage. Under grazing conditions, natural grassland or artificial grassland can basically meet its nutritional needs. Under house-feeding conditions, roughage accounted for 70%-80% of the diet, ruminant livestock had a good utilization effect on straw feed, corn stalks were chopped and fed, and the amount of solar eclipse for the fattening hybrid bull was 9 kg-10 kg, with 3 Kilograms of concentrated feed, daily weight gain of 500 grams or more. The digestibility of corn stover is 40%-45%, and the digestibility of ammoniated corn stover is about 60%. Roughage of cellulose content of more than 30%, in the digestive tract from the filling, and promote gastrointestinal motility and improve digestion. Therefore, in ruminant livestock diets, there must be a sufficient amount of roughage in order to fully play the role of other feeds. Demand for non-rubid livestock for roughage Non-ruminant livestock means that horses, pelicans, and donkeys in herbivores have a more developed cecum and can also make heavy use of roughage. However, under normal circumstances, roughage requires processing or mixing. Concentrated feed can achieve better feeding results. Pigs have poor digestion and absorption of roughage and need to process the roughage into powder. The amount used is generally more than 10%. High-quality grass powder can be slightly more, straw powder is usually 5%-6%, too much will have a negative effect. Poultry demand for roughage Gooses and ducks in poultry tend to eat fresh green grass. The proportion of roughage in the diet is about 5%, and roughage of broilers or layers only accounts for 2%-3% of the diet. Livestock has low digestibility and utilization of roughage and requires high-quality grass powder such as alfalfa, clover and other grass powders. The roughage mainly promotes the creeping action of gastrointestinal foods in poultry breeding, and the main nutrient is supplied by the concentrate feed.