Preliminary investigations on some unusual feedstuffs as yolk pigmenters in Ghana
1972
Agudu, E.W., Animal Research Institute, P.O. Box 20, Achimota, Ghana
Cassava (Manihot utilissima Pohl) and Madras Thorn (Pithecellobium dulce) leafmeals, a synthetic xanthophyll material and two sources of yeIlow corn were evaluated as sources of egg yolk pigments in four separate experiments using White Leghorn strain-cross pullets. Visual colour assessment of yolk colour was based on potassium dichromate solutions. Xanthophyll assays showed that cassava leafmeal had higher total and pigmenting xanthophyll contents than Madras Thorn leafmeaI. Increased leafmeals in the diets resulted in increased yolk score which was not proportional to the level of the leafmeal content of the diets. Local yeIlow corn which had higher xanthophyll content than that of U.S.yeIlow corn, however, produced eggs with a lower yolkscore. The commercial xanthophyll material had unusuaIly low xanthophyll content and consequently had no significant effect on yolk colour when supplemented at twice the recommended level to a white or yellow corn diet.
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