What are microecological preparations, what types are there, and what are their application scopes?

Microecological preparation is a fairly comprehensive term, referring to live bacterial preparations made from normal beneficial microorganisms inside and outside the animal body through special processes. Microecological preparations can also be called probiotics, biogenics, biostimulants, biocins, growth promoters, etc. (1) Types of microecological preparations: According to the microbial products that the U.S. Food and Drug Administration (FDA) has published as "directly fed" (Directly Fed Microbial Products), there are more than 40 strains.
  At present, the main ones researched and applied are Bacillus species (such as Bacillus cereus, Bacillus licheniformis, Bacillus spp., Bacillus thuringiensis, etc.), Lactobacillus species (Lactobacillus, Bifidobacterium, etc.), Streptococcus faecalis, yeast, Aspergillus niger and Aspergillus oryzae, etc. The microecological preparations made from these bacteria, in addition to being consumed by humans, include for aquatic use photosynthetic bacteria (PSB), Beinake bacterial preparation, Meijunfang, Jylo (Arthrobacter), Jy31 (Lactobacillus), compound Huichunsheng (Bifidobacterium preparation), Yijunwang, EM (effective microorganisms), etc.

At present, microecological preparations on the market vary greatly in quality, so can everyone share their own usage situations with everyone!

Hunan's "Jihuo" brand feed companion -- biologically fermented feed. Replacing prevention with grain, live bacteria and no antibiotics. Stimulates pigs' growth potential, prevents and resists disease, and grows fast. Lowers the overall cost for farmers.

It is indeed true that the microecology market is quite chaotic now, and there are no certain regulations to constrain product quality. There is a lot of exaggerated product advertising. Do things steadily, do things perfectly. Provide assistance for the health of humanity and the Earth!!!
I think the use of microecological preparations has a relatively low cost, and increasing the amount in daily addition can make the effect more directly visible.