“…Microalgae are rich in protein, polysaccharides, unsaturated fatty acids, cytochromes (such as chlorophyll, astaxanthin and lutein) and other important bio-active substances, which can be widely used in animal feed. 13 At present, the main functions of microalgae, such as Arthrospira (Spirulina), Chlorella, Scenedesmus, Nannochloropsis, and Cryptocaryon sinensis, used as feed additives 14 are as follows: (1) they are nutrient-rich with a protein content of as high as 50% or more, which signicantly increases its nutritional value, 15 (2) it enriches the feed with pcarotene, astaxanthin and lutein and other high-efficiency antioxidants, which can improve the immune function of animals, and (3) it enriches the feed with polysaccharides, which regulate the life process of cells and improve the body's immunity. By feeding animals with algae or yeast biomass, it can signicantly improve the saturated fatty acid content of meat, eggs and milk.…”