It is a misconception that there is just one strategy or feed additive that can be considered to be the only true alternative to high ZnO dosages or AGPs. Many products containing diverse active components such as essential oils, pre- and probiotics, organic acids and others, alone or in combination are recommended. Their use requires as prerequisites general management measures such as hygiene and stress reduction, and dietary adjustments such as a balanced supply of fibre, the use of highly digestible protein sources and the ­avoidance of protein oversupply.

Feed cost accounts for 60-70% of the total cost of poultry production. Feed efficiency is instrumental in ensuring profits and performance. As the use of antibiotics in feed becomes increasingly restricted, producers must start examining other options to optimize production, while ensuring the health of their flocks. Production views have shifted from treatment to prevention, and probiotics are being considered as an important supplement to animal feed. Probiotics work to boost the immune system so birds are less susceptible to effects from harmful pathogens, while also maintaining a healthy gut.

Gut microflora ferments dietary fibre and creates acetic, propionic, and butyric acids along with carbon dioxide, hydrogen, and methane which supply energy, and improve gut health and development in pigs. Furthermore, some components of dietary fibre promote beneficial gut bacterial proliferation, prevent colonisation of opportunist pathogens, and reduce severity of gut infections. For instance, starch fermentation increases bifidobacterial growth, pectin fermentation stimulates lactobacilli proliferation, and insoluble non-starch polysaccharides fermentation enhances cellulolytic Ruminococcus-like bacteria and xylanolytic Clostridium-like bacteria growth.

C. butyricum  liquid can reduce the incidence of intestinal disease and improve the production performance by improving the intestinal structure and the composition of intestinal microflora, it can reduce disease occurrence and improve production performance.

farmers in order to reduce costs, through their own purchasing raw materials with feed, directly hinder the normal growth of eel nutrition demand and product quality. Therefore, it is of great significance to adjust the eel breeding intestinal health and enhance the intestinal function in the actual breeding.

At present, C. butyricum is increasingly recognized by farmers in aquaculture. C. butyricum is more conducive to animal intestinal health in commonly used probiotics, and it is known as "the first intestinal bacteria". Good intestinal tract, good digestion and absorption, to improve the yield and animal body health have absolute advantages. In this paper, a test case analysis ofC. butyricum was used to verify the comparison of growth performance and intestinal health with different concentrations of C. butyricum.

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