Due to the rapid growth of broilers, the shelf time of broilers is generally around 42 days, and the regular feed is generally difficult to meet their nutritional needs, especially the higher requirement on energy. As a high-energy feed raw material, fat is often added to the diet of broilers to improve the energy.Due to the short growth cycle of broilers, liver development is not sound, endogenous emulsifier - bile acid secretion is insufficient, which affects the utilization of energy in the feed and at the same time makes the liver in a constituenthighly fatigued state, thus causing the waste of energy in the feed and the deterioration of the body's health status.Therefore, it is necessary to add exogenous emulsifiers to the diet of broilers to improve their digestibility to fat, so as to make broilers grow healthily, so as to solve nutritional diarrhea, fatty liver, hepatitis and other diseases, and improve broilers' production performance and immune function.In order to solve this problem, emulsifier has become a kind of functional additive that formulators must choose. The following is a comparison of different kinds of emulsifiers on the market to provide a reference for feed companies to choose appropriate emulsifiers.

At present, the common emulsifiers on the market are kangbei ning (bile acid), phospholipid, single glyceride and chemical synthesis. The following is a comparison in terms of composition and function, so as to screen the advantages and disadvantages of various products. 

Constituent
1. Kangbei ning bile acid, as an emulsifier, is a product of animal evolution and has inherent advantages. The addition of exogenous bile acid can also reduce the burden on the liver and play a role in liver protection and gallbladder protection.
2. Phospholipids are soybean phospholipids extract. Phospholipids themselves are energy substances, and their digestion and absorption will increase the burden of the liver.
3. Monosodium glutamate is mainly sucrose ester, and it is mostly industrial emulsifier.
4. Chemical synthesis, mainly composed of surfactants, does not conform to the metabolic pattern in vivo.
                         Function 
Phospholipids, monoglycerides and chemical compounds can only emulsify fats and act only in the first stage of fat digestion and absorption. In the whole process of fat digestion and absorption, the functions of corbetine (25% bile acid) are as follows:
1. Promote the emulsification of fats (typically found in emulsifiers).
2. Activate lipase and enhance the activity of lipase, so lipase is also called biliary salt-dependent lipase.(Mechanism: Pancreatic secreted lipase is converted into active lipase in the small intestine to function, and its activation must be involved in bile acid, and bile acid can bind lipase to the surface of triglyceride lipid droplets to act as a catalyst.The optimum pH range of lipase function is 8 ~ 9. In the small intestine with a pH of 6 ~ 7, lipase basically does not work. However, when lipase forms a complex with bile acid, the properties of lipase change and lipase can play a role in the small intestine with a pH of 6 ~ 7.
3. In the process of fat absorption, bile acids can be recognized by intestinal epithelial cells, so that fatty acid-bile acid complex can enter the small intestine chorionic membrane to complete the fat absorption process.(Animal gut recognition of bile acids is the result of natural selection in evolutionary biology.)
In addition, bile acids have the following advantages.
1. Protecting liver, bravery, improve broiler growth performance, kang inspection times better after a long period of practice, can improve the chicken weight 80-110 grams, reduce abdominal fat, improve the trunk of the rate of 0.5 0.8% (mechanism: along with the extensive use of antibiotics in aquaculture, antibiotics kill bacteria to produce large amounts of endotoxin serious impact on animal health, and the liver in all the digestion and absorption of nutrients, decomposition of toxic and harmful substances, detoxification process plays a very important role, liver lesion caused a series of digestion, absorption, obstacle, then the deoxycholic acid in the bile acid, can effectively decompose the endotoxin.Deoxycholic acid can also promote the secretion of a large amount of thin bile by hepatocytes, making the biliary tract unblocked, eliminating cholestasis and playing a gallbladder enhancing role.Many drugs, heavy metals, mycotoxins and other harmful substances are also excreted from bile to maintain animal health.)
2. To improve the body immunity, enhance the disease resistance of broiler chickens, and improve the survival rate of breeding, which just meets the current situation that drugs are strictly prohibited in standardized breeding farms. A large number of experiments have proved that the use of corbetine (25% bile acid) can increase the survival rate by 1.5-1.8%.(mechanism: bile acid is a product of cholesterol metabolism in the body, and cholesterol is another important metabolic pathway of the cortical hormone synthesis, cortical hormone levels determine the body's immune status, if the body to digest fat, excessive synthesis of bile acid, then corticoid material synthesis will fall and immunity will reduce.)
In conclusion, kangbuprofen (25% bile acid), as an emulsifier, could not only help make full use of fat in the diet, but also protect liver and gallbladder, improve daily weight gain and survival rate, reduce abdominal fat rate and increase rice production rate, with obvious effects and advantages.