Gamma-aminobutyric acid (GABA) is a four-carbon non-protein amino acid widely found in vertebrates, plants, and microorganisms. It is a strong neuroinhibitory amino acid with sedative, hypnotic, anticonvulsant, and hypotensive physiological effects. As an inhibitory neurotransmitter, it can inhibit animal activity and reduce energy consumption.

Lipase, also known as triacylglycerol acylhydrolase, catalyzes the hydrolysis of natural substrate oils and fats, producing fatty acids, glycerol, and mono- or diglycerides. Lipases are composed of amino acids as their basic units and usually consist of only one polypeptide chain. Their catalytic activity is solely determined by their protein structure.

β-1,4-mannanase, abbreviated as β-mannanase, is a kind of endoenzyme that can hydrolyze manno-oligosaccharides and mannopolysaccharides (including mannan, galactomannan, glucomannan, etc.) containing β-1,4-mannosidic bonds. It belongs to hemicellulase.

β-glucanase (β-1,3-1,4-glucanase). It is produced by Bacillus licheniformis through liquid deep fermentation. This enzyme is an endoglucanase that specifically acts on the 1,3 and 1,4 glycosidic bonds of β-glucan, producing oligosaccharides and glucose with 3-5 glucose units.

Xylanase is an enzyme preparation produced by fermentation, ultrafiltration, and spray drying using Trichoderma reesei. Its main activity is endoxylanase, which can break down soluble or insoluble fiber structures in arabinoxylan. It also contains β-glucanase, cellulase, and glucoamylase activities.

Cellulase is widely present in organisms in nature. Bacteria, fungi, and animals can all produce cellulase. Cellulase generally used in production comes from fungi, typical examples being the genera Trichoderma, Aspergillus, and Penicillium.

Acid protease is a microbial protease produced by fermentation of Aspergillus niger. Its main activity is protease, which hydrolyzes yeast and fish meal to increase amino acid content. It can also supplement the deficiency of endogenous enzymes in animals, improve the utilization rate of energy in feed, promote the growth of livestock and poultry, increase daily weight gain, reduce feed-to-weight ratio, and improve their production performance.