Natural colorants that make the skin and fat of chickens brightly colored

The commonly used natural colorants and their addition amounts are: alfalfa meal 5%, pine needle meal 5%, black locust leaf meal 5%, red chili powder 0.3%, marigold powder 0.3%, calendula petal powder 0.5 to 0.7%, dried orange peel powder 2 to 5%, dried laver powder 2%, dried cow dung powder 1 to 2%, krill meal 3%, silkworm excrement 6%, etc. In addition, synthetic oxycarotenoids such as beta-apo-carotenal, beta-apo-8'-carotenoic acid ester, canthaxanthin, tartrazine, and some antibiotics such as oxytetracycline and chlortetracycline, when added in appropriate amounts to chicken feed, can also improve the color of chicken skin, fat, and eggshells, thereby increasing their commercial value.