Choline Chloride (often classified as vitamin B4) is an important member of the B-vitamin family. As an essential precursor for the synthesis of phospholipids, acetylcholine, and betaine, it performs key physiological functions in animals, including promoting fat metabolism (preventing fatty liver syndrome), participating in methyl transfer (sparing methionine), maintaining nerve signal transmission, and building cell membrane structures. Feed-grade products are mainly divided into50% or 60% powdered formulations adsorbed on plant carriersand70% or 75% liquid aqueous formulations(implementing the GB/T 10818 standard), of which the powder form is convenient for compound feed processing, while the liquid form is mostly used in premixes and liquid feed; deficiency in poultry can lead to fatty liver, reduced egg production, and higher cracked egg rates, while pigs exhibit growth retardation, joint deformities, and lactation disorders in sows. Therefore, it is a fundamental additive used in very large quantities in livestock and poultry feed, but due to itsstrong hygroscopicity, it usually needs to be added separately at the final stage of feed production to avoid potency loss caused by long-term mixing with other vitamin premixes.