The crude fiber in the feed can be produced by microbial fermentation of complex proteins in the cecum, colon and rumen of animals, but its utilization is often affected by lignin. Crude fibres are generally considered to be used by ruminants and should not be a major part of poultry diets. The lower the dietary fibre content, the greater the potential for feeding fast-growing livestock. In fact, the proper addition of crude fiber to poultry diets helps maintain the normal structure and function of the poultry gastrointestinal tract. Poultry's ability to digest feed fibers Poultry's ability to digest fiber is limited. It is estimated that the time for feed to pass through the digestive tract of poultry is only 4 hours. In the small cecum, the chance of microbial action is very small. Generally, the fiber digestibility is 0.9%~42.44%. The average is 16.02% 2.23%. The digestive rate after resection of the cecum was reduced to 0% to 1.4%. Adding grains in the diet can increase crude fiber digestibility by 10%. Effect of Feed Fiber on Poultry Production Performance The degree of regulation of poultry feed intake is related to the characteristics of feed volume or density. High fiber feed has low metabolic energy concentration, large volume, strong water holding capacity, and rises when it meets water. When feeding, the quantity and frequency of drinking water increase, which is not conducive to the increase of feed intake of poultry. Studies have shown that adding 10% alfalfa meal, 30% rice hull, 10% cotton cake, 15% rice bran, 10% wheat bran, or 5% oat hull to broiler diets does not affect broiler growth. However, the addition of 6%, 18%, 10% or 40% cellulose, 40% rice hulls, and 5% to 10% acidic detergent fiber, respectively, will reduce broiler growth. Experiments have shown that when the fiber level reaches 10%, 11%, 20%, and 25% respectively, the growth performance is not affected in the diet of Chih-Ji chicks, but it takes 7 days to 10 days to adapt. In other experiments, some of the pilots found that although they had increased feed intake when they ate 10% fiber, they could not maintain their metabolic energy intake. At the same time, the use of 8% pectin or 10% arabinan or xylan or 10% hemicellulose or 30% cellulose in the diet, respectively, can reduce the growth of Leghorn chickens. Adding 20% ​​corn cob and cassava meal residue or 10% cellulose or wheat bran or 10% dehydrated meal or 6% pine sawdust to the diets of laying hens did not affect hen weight gain and egg production. However, 20% of husks such as cassava shells, tapioca, sawdust, or 15% cellulose all reduce egg production. Adding 40% cellulose to the total duck diet, the duck’s metabolic energy intake decreased by only 4%. Adding 5% to 15% alfalfa meal to the turkey diet results in reduced turkey growth. Through feeding trials among different levels of energy, protein and fiber levels in 90 goose geese, it was found that during the 0-day to 28-day-old days, the dietary crude fiber content increased from 5% to 7%, crude protein from 24 % decreased to 20%, metabolisable energy decreased from 11.76MJ per kilogram to 11.37MJ, no effect on weight gain, but when the metabolic energy was reduced to 10.93MJ per kilogram, the growth rate of the geese was significantly slower; at 29 days to 56 days During the period, dietary fiber content increased from 7% to 9%, crude protein decreased from 20% to 18%, and metabolisable energy decreased from 12.24MJ to 11.83MJ per kilogram, with no effect on weight gain, but crude protein decreased to 16%. Metaphorical energy dropped to 11.35 MJ per kilogram. Effects of Feed Fiber on the Utilization of Poultry Mineral Elements According to experimental studies, the utilization of Ca, P, Mn, Zn, and Fe in the various diets of cakes is negatively correlated with the crude fiber content. Adding 8% cellulose, polyethylene, and limulus cell walls to the diet of chicks results in a decrease in liver, iliac, serum Zn, and Cu concentrations, but does not affect Ca, Mg, and Fe concentrations; use of 4% or 8% corn, respectively Bran, oat bran and wheat bran reduced the concentration of Zn in tissues and organs.
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