canthaxanthin , ( 4,4'-diketo-beta , beta-carotene ) , a red carotenoid used to extend the dominant wavelength of the yellow pigments in the skin and egg yolk of chickens , was fed ( 70 micrograms/g diet ) to chicks depleted of normal tissue oxycarotenoids .
C0053396
beta-carotene
C0007271
carotenoid