Additive for increasing feed intake of nursing sow and application thereof

The invention provides an additive for increasing feed intake of a nursing sow and an application thereof. The additive comprises 100-500 mg of gamma-amino butyric acid (GABA), 300-800 mg of cysteamine salt (CS), active yeasts of (0.5*10 )-(4*10 ) CFU (Colony-Forming Units), 0.5-3 g of enzyme-producing probiotics (BD500) and 2-10 g of potassium diformate; and the plurality of substances aremixed according to an optimal mixing concentration to be added to feeds for the nursing sow. By using the product, the feed intake and lactation yield of the sow can be obviously increased and the growths of the piglets can be promoted; meanwhile, the product also has good effects in aspects of resisting heat stress, improving the intestinal tract environment and enhancing the immunity of the organism.