Kuroha black-bone chicken is like a natural nutrition processing factory. After eating original feeds such as platycodon grandiflorum peel, pepper seeds, bean stalks and corn, it is not only not easy to be infected by epidemics, but also extremely rich in trace elements, vitamins and minerals. It absorbs a lot of these nutrients and transforms them into eggs, with an average weight of 4 grams per egg. Its eggs are green, with large yolk, orange color and thick egg white. Oocyan(O) gene, which determines the shell color of green shell laying hens, is located on chromosome 1. The pigments of green chromosome and green eggshell mainly include protoporphyrin, biliverdin and zinc complex of biliverdin. Kuroha black-bone chicken eggs contain a lot of lecithin, cephalin, neuropeptide, high-density lipoprotein, vitamins A, B, C and E, and trace elements iodine, zinc and selenium. The amino acid content is 2-1 times higher than that of ordinary eggs, the protein content is 13.2%, the cholesterol content is 4% lower, the fat is 25% lower, the yolk is 8% larger than that of grass chicken, and the yolk pigment can reach Roche grade 13 or so. The Haagen unit β globulin and γ globulin in egg yolk are obviously higher than those in other chicken breeds, which is consistent with improving immune function in clinic. It is an ideal natural health food with high vitamins, trace elements, amino acids, low cholesterol and low fat.