1. Overview of the types of feed microorganisms Feed microbes are live bacterial preparations produced by fermenting beneficial microbial flora. There are a wide variety of probiotics, and more than 40 species have been published by the US Food and Drug Administration (FDA) and the American Feed Association (AAFCO). There are 15 kinds of microorganisms in the "No. 1126 Catalogue of Feed Additives" issued by the Ministry of Agriculture of China in 2008: Bacillus licheniformis*, Bacillus subtilis, Bifidobacterium bifidum*, Enterococcus faecalis, Enterococcus faecium, lactic acid intestine Cocci, Lactobacillus acidophilus, Lactobacillus casei, Lactobacillus lactis*, Lactobacillus plantarum, Pediococcus lactis, Pediococcus pentosaceus, Candida utilis, Saccharomyces cerevisiae, Rhodopseudomonas palustris. In the 2010 draft of the Exposure Draft (Agriculture and Animal Husbandry Letter [2010] No. 253), I want to delete the asterisks of Bacillus licheniformis, Bifidobacterium bifidum, etc., and I want to increase the amount of propionate produced by silage. Acid bacillus, Lactobacillus brevis, Lactobacillus paracasei, and other protected Bacillus coagulans and Bacillus licheniformis are to be included. 2. Advantages of Bacillus Bacillus is only sporadically present in the intestines of animals and belongs to the pathogens in the intestinal tract of animals. At present, Bacillus subtilis, Bacillus licheniformis and Bacillus cereus are relatively abundant as research and application of probiotic products. Bacillus is a kind of aerobic bacteria, which produces spores under certain conditions. Compared with probiotics such as lactic acid bacteria, Bacillus has the following advantages and characteristics: 1 has the characteristics of high temperature resistance, acid and alkali resistance, extrusion resistance, etc., can withstand the impact of pellet feed processing; 2 in the form of spores during storage, does not consume the nutrients of the feed, can maintain the quality of the feed; 3 After entering the intestine, it is quickly revived in the upper part of the intestine, and the resurrection rate is close to 100%. 4 Bacillus can produce protease, amylase, lipase and a variety of amino acids; 5 Bacillus can consume a lot of oxygen, maintain the intestinal anaerobic environment, inhibit the growth of pathogenic bacteria, maintain the normal ecological balance of the intestine; 6 has the effect of balancing and stabilizing lactobacilli. Bacillus licheniformis is the most ideal microbial additive. It has high protease, cellulase and amylase activities and has strong degradation ability to plant carbohydrates. Moreover, Bacillus licheniformis has high stability in the processing of granular materials and powders and in the process of passing through acidic and alkaline environments, and plays a role in the intestinal tract without excessive proliferation. Bacillus licheniformis can use glucose to produce acid, has a high survival rate in the range of pH 2.2-7.0, and is resistant to various antibiotics. It is a relatively good probiotic.
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