Feed complex enzymes are a class of hydrolytic enzymes, including amylase, protease, lipase, phytase, cellulase, xylanase, pectinase, β-glucanase, mannanase, etc. There are no enzymes that decompose phytate, cellulose, hemicellulose, pectin and other non-starch polysaccharides in the digestive tract of monogastric animals, and the endogenous digestive enzymes are insufficiently secreted in young animals or livestock with digestive tract dysfunction in the late weaning period. At the same time, a considerable part of the organic matter fed by livestock cannot be digested, and the addition of complex enzymes can supplement the lack of endogenous enzymes in the animal's body and eliminate the anti-nutritional factors in the feed. It can significantly improve the utilization rate of feed, expand the range of available feed resources, reduce breeding costs, and improve the ecological environment of breeding. The effective application of enzyme preparations in the feed industry makes it possible for the feed industry and aquaculture industry to develop safely, efficiently, environmentally and sustainably.

1. Types of Feed Compound Enzymes
The composite enzyme preparation is composed of one or several single enzyme preparations as the main body, and mixed with other single enzyme preparations, or is obtained by co-fermentation of one or several microorganisms. The compound enzyme preparation can use the synergistic effect of various digestive enzymes to degrade feed, maximize the utilization of nutrients such as energy and protein in the feed, and achieve the purpose of increasing weight gain and feed utilization. According to the different functional characteristics of feed compound enzyme preparations, it can be divided into the following categories:

① Feeding compound enzymes mainly digestive enzymes such as protease and amylase. Such enzyme preparations are mainly used to supplement the deficiency of animal endogenous enzymes.
② Feed compound enzymes mainly based on xylanase or β-glucanase. Such enzyme preparations are mainly used in diets that use wheat crops as feed.
③ Feed complex enzymes mainly composed of cellulase and pectinase. Such enzymes are mainly produced by direct fermentation of Trichoderma, Aspergillus and Penicillium. Their main function is to destroy plant cell walls and release nutrients in the cells for further digestion and absorption.
④ Feed complex enzymes based on pectinase, mannanase, and xylanase can eliminate the viscous anti-nutritional factors of corn-soybean meal, wheat-soybean meal and other types of rations.
Protease, amylase, xylanase, pectinase, etc. are a combination of general-purpose feed enzyme preparations.

2. Application effect of compound enzyme for feed
2.1 Improve feed utilization and improve livestock and poultry production performance
Feed enzyme preparations can hydrolyze the macromolecular substances in the feed into small molecules that are easily absorbed in the digestive tract of animals, reduce the excretion of nutrients in the feces, that is, play an auxiliary role in supplementing endogenous enzymes. In the case of imperfect development of digestive enzymes in young animals, reduced digestive enzyme secretion capacity of old animals, and disorders of digestive enzyme secretion caused by stress or disease-infected animals, exogenous digestive enzymes can supplement the deficiency of endogenous enzymes and enhance The ability of animals to digest and absorb feed nutrients, thereby improving livestock productivity and feed conversion efficiency. Research by Bedford and Pack showed that the complex enzymes containing amylase, xylanase and protease have a certain effect on the nutritional value of corn-soybean meal type diets, and can increase the available corn energy by 2% to 5%.

2.2 Decompose anti-nutritional factors in feed
There are many substances in the feed that are not conducive to the digestion and absorption of nutrients or have an adverse effect on the digestive function of animals. Feed enzyme preparations can decompose these anti-nutritional factors, thereby increasing the utilization rate of feed and improving the health of animals. Among plant feeds, especially meal feeds such as soybean meal contain trypsin inhibitors, plant lectins, α-galactosides, arabinoxylans, β-glucans, mannans, and the like. Protease can degrade trypsin inhibitors and plant lectins, eliminate their anti-nutritional effects, and improve the digestibility and utilization of feed protein. Xylanase, cellulase and β-glucanase can effectively eliminate the anti-nutritional effects of xylan and other non-starch polysaccharides, improve the digestibility and metabolic energy of nutrients in feed, and improve livestock and poultry production performance and immunity.

2.3 Reduce environmental pollution from livestock production
The modern aquaculture industry is characterized by large-scale intensive production, which is increasingly polluting the environment, such as eutrophication caused by nitrogen and phosphorus. Adding enzyme preparations such as protease and phytase to feed can reduce the excretion of nitrogen, phosphorus and other elements in livestock and poultry, which is beneficial to environmental protection.

Author's Bio: 

Creative Enzymes is a remarkable supplier and manufacturer in the Enzymology field. Equipped with advanced technique platform, Creative Enzymes is able to offer high-quality and professional services for customers. Its products and services are widely used in the academic and pharmaceutical industries.