Why are the eggs laid by some chickens green?

Green-shelled eggs, each weighing 45g on average, are green and pure natural, with large and yellow yolk, thick and thick egg white and tender protein, which are easily digested and absorbed by human body. They contain a lot of lecithin, vitamins A, B and E, and trace elements iodine, zinc and selenium. The amino acid content is 5- 10 times higher than that of ordinary eggs, and the yolk is 8 times larger than that of grass chicken. Clinical trials in the Affiliated Hospital of Shanghai Second Medical University and functional tests in Hubei Provincial Health Department and Jiangxi Provincial Hospital of Traditional Chinese Medicine have proved that it has obvious effects on anorexia, pica, low immunity, short stature, cardiovascular and cerebrovascular diseases, thyroid tumors and anti-aging caused by zinc deficiency syndrome in children, and has effects on preventing hypertension, hyperlipidemia, coronary heart disease, cancer prevention, fetal dysplasia, endocrine regulation, delaying female menopause, beauty beauty and supplementing nutrition for pregnant women and patients. Analysis and tests show that green shell eggs can also activate brain cells and enhance memory. Green-shelled eggs are veritable healthy eggs, intellectual eggs, beauty eggs and life eggs, which Yu Ruomu, a famous nutritionist in China, called "magic eggs". As the saying goes, "an egg with a green shell every day can strengthen the body and beautify the patients." Green-shelled eggs were accepted as invention patents by the State Patent Office in August 1996, approved as green food by the National Green Food Development Center in June/5438+ 10/0 in the same year, and approved as health food by the Ministry of Health in August/998.