Preparation of compound rumen bypass polyunsaturated fatty acid powder and use thereof

A method for preparing a compound rumen bypass polyunsaturated fatty acid powder, comprising the following steps:

• 1) dissolving and mixing uniformly DHA oil, ARA oil and an oil-soluble antioxidant system to obtain a mixed oil;
• 2) spraying the mixed oil into an adsorbent under vacuum for adsorption;
• 3) after complete adsorption, adding a water-soluble antioxidant and an enzyme for promoting digestion and absorption of unsaturated fatty acids, and uniformly mixing the mixture to form a mixed powder;
• 4) processing the mixed powder obtained into core pellets;
• 5) coating the core pellets with a coating material solution to form a first rumen bypass coating;
• and
• 6) mixing uniformly the coated core pellets with a dissolved outer coating wall material, cold spraying, drying and sizing to form fixed granules to obtain the compound rumen bypass polyunsaturated fatty acid powder finished product, wherein
• in step 5), a solute of the coating material solution is one of or a mixture of more of carrageenan, locust bean gum, pullulan, chitosan, algal polysaccharide and hyaluronic acid;
• and
• in step 6), the outer coating wall material is one of or a mixture of more of hydrogenated palm fatty acid, fatty alcohol, monoglyceride, diglyceride, sorbitol palmitate, hydrogenated stearic acid, stearin fat powder and palm fat powder.