The fat or fat-soluble vitamins, carotene and carotenoids in pig feed are easily oxidized and destroyed by oxygen in the air, which causes the nutritional value of the feed to decrease, the palatability to deteriorate, and even the rancidity of the feed. Oxides are toxic to animals. Adding certain antioxidants to pig feed can delay or prevent the automatic oxidation of substances in the feed, and is an effective method to solve the problem of oxidation of feed during production, transportation and storage.
There are many substances that can be used as feed antioxidants, such as l-ascorbic acid, butylated hydroxytoluene, butylated hydroxymethoxybenzene, tocopherol, ethoxyquinoline, etc., and other antioxidants used in foods. It is mainly used for feeds containing high fat to prevent oxidative rancidity of fat, and is also commonly used in premixes containing vitamins to prevent oxidation failure of vitamins. Due to price and other reasons, the most widely used antioxidants for pig feed are ethoxyquinoline, which is widely used in raw fishmeal abroad, followed by butylated hydroxytoluene and butylated hydroxytoluene. In addition, citric acid, tartaric acid, malic acid, phosphoric acid and the like have no anti-oxidation effect, but have a blocking effect on metal ions, so that metal ions can not act as a catalyst, and the anti-oxidation effect can be enhanced by using together with an antioxidant. At the same time, the combination of the two antioxidants has an additive effect.
Antioxidants are mainly used in pig feed for the following aspects: for feed fats, fishmeal, animal slaughter by-products and other high-fat pig feed ingredients. It is used in pig feed ingredients with high content of lotus root starch, leaf powder, grass powder and other carotene and carotenoids to prevent oxidative damage of vitamin A and pigment, and increase its coloring effect and utilization rate. Used in premixes containing vitamins to prevent a decrease in their activity. It is added to pig feed and other oxidized raw materials to prevent oxidative damage of easy oxides, improve their utilization rate and effect, especially in aquatic bait and pet pig feed with high oil content.
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