Crude fiber can promote gastrointestinal peristalsis.

, and can dilute the nutrients in the diet, which is beneficial to the digestion and absorption of nutrients. When there is little crude fiber in the diet, the digestive tract peristalsis is insufficient, which can make the nutrients in the diet poorly absorbed and have a bad influence on the production performance of chickens. Chicken feed contains a proper amount of crude fiber, which increases the volume and feed intake of chickens. It takes a long time to meet their energy needs and can reduce or prevent pecking habits of chickens. Crude fiber can also reduce cholesterol in eggs. It has been reported abroad that adding 9% sunflower seed powder with shell and high crude fiber to the feed of laying hens can reduce the cholesterol content in eggs by 65438 03%, and adding cellulose extracted from wood to the feed can reduce the cholesterol content in eggs by 65438 06%.

Side effects of crude fiber

Crude fiber is one of the anti-nutritional substances in chicken feed.

. When the crude fiber in the feed is high, it can accelerate the peristalsis of the digestive tract, make chyme pass through the digestive tract quickly, and make some nutrients be excreted without being absorbed, resulting in a decrease in digestibility. According to foreign research, when the crude fiber in chicken feed increases 1%, the digestibility of organic matter decreases by 2.33%. Domestic research shows that the digestibility will decrease by 2% and the available energy will decrease by 3.5% when the crude fiber in chicken feed increases by 1%. However, soluble fibers such as dextran, arabinoxylan and pectin in hemicellulose enter the digestive tract and form colloidal mucus, forming a viscous environment, which limits the spread of chyme and the contact between digestive enzymes and nutrients.

, hindered the digestion and absorption of nutrients. This is another reason why crude fiber leads to low digestibility. At the same time, due to the viscosity of chyme, it is easy to cause feces or diarrhea of chickens, and the adverse consequences include contaminated eggs, high rate of dirty eggs, easy cracking of hatched eggs, and poor air quality in chicken houses, which affects the health and production performance of chickens. Broilers raised on thick bedding grass, due to the high water content of bedding grass, some of their staggered joints turned black, the rate of chest cysts was high, and the carcass quality decreased. In addition, crude fiber also has ion exchange function, and can be combined with calcium, magnesium, zinc and copper, so that these minerals are not absorbed and utilized by monogastric animals. According to foreign research, adding 20% high crude fiber wheat bran to feed will reduce the absorption of calcium, phosphorus, zinc, iron and copper in broilers.