DHA is the main component of phospholipids in human brain and retinal nervous system. A large number of studies show that DHA can inhibit platelet aggregation, prevent thrombosis and stroke, and prevent cardiovascular diseases and Alzheimer's disease. Reduce blood lipid, cholesterol and blood pressure; Enhance the reflex ability of retina and prevent vision loss; Enhance memory and improve learning efficiency; Hypoglycemic and antidiabetic; Allergy. DHA is more important for the normal functioning of human physiological functions, especially for the brain development of fetuses and infants, and has a significant effect on enhancing thinking ability, memory and intelligence. Population epidemiological studies have found that people with high DHA content in their bodies have stronger psychological endurance and higher intellectual development index.
A large number of studies show that eggs can be rich in DHA. With eggs and DHA as key words, a large number of literature reports can be searched.
To produce eggs rich in DHA, it is only necessary to add DHA-rich feed to chicken feed. When the DHA content in the feed reaches a certain level, the DHA content in eggs can reach the standard quickly, making production easier. Eggs are widely used in human diet. It is estimated that eating 1~2 eggs rich in DHA every day can reach the recommended intake of DHA, which is of practical positive significance to make up for the shortage of DHA intake. DHA in feed can filter out or reduce harmful pollutants through the screening effect of laying hens [1].
At present, fish oil, flaxseed and seaweed are the main feed materials that can be used to produce DHA-rich eggs. The content of DHA in algae is high, which is the food source of many aquatic animals and the original source of DHA in their bodies. Therefore, algae can be used as the main source of DHA in laying hen feed. At present, the cracked pot algae oil sold by Hunan Jianong Zhenghe Biotechnology Co., Ltd. can be well used for laying hens to enrich DHA in eggs. When the feeding concentration is high, the DHA content in eggs can reach 300+mg/ 100g.
In addition, DHA fish oil and DHA seaweed oil have strong fishy smell, which many people can't accept. Laying hens enrich DHA in eggs, and the fishy smell of DHA disappears before, and the eggs taste good and positive. If DHA is enriched with cracked algae oil, the enriched eggs need special seaweed flavor. Most DHA products in the market are expensive, with limited content and narrow application scope. Most of them are mainly gifts and grade consumption, which loses the purpose of popularizing DHA and strengthening food. The production cost of DHA eggs is slightly higher than that of ordinary eggs, but the DHA content is insignificant compared with the price of DHA products in the market, which can be used by the masses and widely promoted in urban and rural areas [2]. Research shows that marine fish oil is rich in? -3 fatty acids, which are easily oxidized, will lead to the increase of peroxide production during cooking and freezing. If the storage and processing conditions are not properly controlled, it will not only lead to? -3 the loss of fatty acids, peroxides will be harmful to the human body, and eggs? -3 fatty acids show high stability.
Eggs are one of the best sources of nutrition for human beings and are known as "the ideal nutrition bank for human beings". The Nutrition Society recommends eggs as a nutritional product? -3 fatty acids are an important dietary source, then? Eggs fortified with -3 fatty acids can be used as one of the better substitutes for marine fish oil.
Studies have shown that in eggs? The content of -3 fatty acids is relatively stable. The structure of DHA in lecithin is also very stable. Under different cooking methods, the loss of DHA is very small, and the most recommended cooking method of DHA is boiled eggs [3].
[1]. Fu Xingzhou, Lu Zhifang, Shen Haiyan, Feng Xianming, Sun. Research progress of DHA-rich eggs [J]. Poultry in China, 2016,38 (09):? 4 1-44.
[2]. Dai Fei, He Pingqian. Development and prospect analysis of DHA eggs [J]. Breeding Technical Consultant, 20 1 1, (6):78-78.
[3] Ray, He Lili, Guo Ying, et al.3 Nutritional loss of eggs fortified with fatty acids under different cooking methods [J]. China Food and Nutrition 2015,21(8): 64-68.