Abstract
COD liver oil, sardine oil, and pilchard oil have been the principal sources of vitamin D for chicken feeding in the past. Increased demands and decreased supplies of these oils in poultry feeding have made it necessary to find other sources of vitamins A and D for poultry. A number of fish oils have very high vitamin A contents. An activated animal sterol has been recently used to a considerable extent in poultry feeding as a source of vitamin D. If fish oils of high vitamin A content and low vitamin D content could be fortified with this activated animal sterol, oils rich in both vitamin A and vitamin D would be available for feeding.Rhian, Carver, and Harrison (1941) investigated the vitamin A and vitamin D content of a number of less-used Pacific Coast fish oils. They found herring and pilchard oils to be low in both vitamins A .
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