(1) The effective use of low-quality, high-fiber feed meat rabbits depends on the synergistic action of microorganisms and lymphocytes in the cecum to allow higher digestibility of crude fiber. Rabbits quickly pass through the characteristics of the digestive tract with the help of caecal microbes and feeds, and quickly eliminate hard-to-digest crude fibers, while non-fiber parts are rapidly digested and absorbed. Therefore, rabbits have a strong ability to use low quality high fiber feed. (2) Rabbits that can make full use of the protein in the roughage can effectively use the protein in the forage, and even have a strong ability to use the protein in the low quality forage. According to studies, rabbit cecal intestine protease activity is much higher than that of bovine rumen. Rabbit cecum and microorganisms in it all produce proteases, while bovine ruminal proteases only come from microorganisms. Some people used the entire plant corn to make pellets. The digestive rate of crude protein was 0.2% for rabbits and 53% for horses. (3) Cecal nutrient The feed intake of the meat rabbit enters the small intestine from the stomach, and the substances that are not easily digested and absorbed enter the cecum and are subjected to the action of microorganisms in the cecum. The decomposed substances are absorbed through the intestinal wall and the remaining contents are discharged into the colon. . The rabbit's proximal colon has a dual function: when the cecal contents enter the colon in the morning, the colon wall secretes a mucus and contracts through the intestinal wall, gradually enveloping the contents, forming a bulb, and clustering together, the so-called "cavitary contents "Or" is called soft feces. As the colon continuously shrinks and alternately changes direction, the liquid containing small particles is mostly squeezed into the cecum, while the hard part containing large particles forms hard fecal pellets and is excreted. The colon uses its special dual function to make two kinds of soft fecal pellets and hard fecal pellets. (4) Crude fibers are necessary for rabbits The digestion of crude fibers by rabbits is mainly performed in the cecum. The study found that rabbit cecal fibrinolytic enzyme activity is much lower than cow ruminal fibrinolytic enzyme activity, resulting in lower crude fiber digestibility of rabbits. In spite of this, the crude fiber must occupy a certain proportion in the rabbit's diet to maintain the consistency of the digesta, contribute to the formation of hard feces, and play a physical role in the normal digestion process. When there is a lack of crude fiber (5%) in feed, stomach contents pass through the digestive tract twice as often, the digestibility of nutrients decreases, feed intake decreases, digestive disorders, diarrhea, and mortality rate rise; If the fiber content is too high, the digestibility of all ingredients in the diet will decrease. The appropriate proportion of crude fiber in the diet should be 12%. China Agricultural Network Editor