Valine is one of the three branched-chain essential amino acids (BCAAs) that animals cannot synthesize on their own. Working synergistically with leucine and isoleucine, it participates in protein synthesis, energy metabolism, and immune regulation, and plays a key role in promoting muscle growth, maintaining nitrogen balance, improving gut health, and relieving stress. In swine and poultry feed, the balanced valine-to-lysine ratio (Val:Lys) directly affects feed intake, daily gain, and lactating sow performance, making valine one of the most critical limiting amino acids in the current promotion of low-protein diets and reduced soybean meal usage. Feed-grade products are mainly in the form ofL-valine (content ≥98%)and are widely added to diets for piglets, growing-finishing pigs, sows, and broilers, cost-effectively filling amino acid shortfalls and improving feed conversion efficiency.