The invention relates to a complex additive for boars and a preparation method and a using method thereof. The additive is prepared from the following components in percentage by weight: 1.00 to 5.00 percent of N-
carbamylglutamic acid, 1.00 to 5.00 percent of
vitamin E, 0.10 to 0.30 percent of
vitamin B2, 0.10 to 0.30 percent of
vitamin C, 1.00 to 2.00 percent of organic
zinc, 0.03 to 0.50 percent of organic
chromium, 0.04 to 0.60 percent of organic
selenium, 0.04 to 0.50 percent of
carnitine 50, 0.001 to 80.00 percent of
functional protein, 0.03 to 0.50 percent of
antioxidant, 0.001 to 0.40 percent of anti-
mildew agent and the balance of carrier. The preparation method comprises the following steps of: 1) weighing the N-
carbamylglutamic acid, the vitamins, organic trace elements, the
functional protein, the
antioxidant, the anti-
mildew agent and the carrier according to a proportion in percentage by weight respectively; and 2) fully mixing the raw materials weighed in the step 1) in a mixer uniformly to obtain the product. The using method comprises that the complex additive is added into daily ration of the boars, wherein the adding amount is 200 to 400 grams very day. The additive can promote the synthesis of source
arginine in the bodies of animals and further enhance the synthesis of
carbon monoxide (NO) and
polyamine.