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Chick rearing. IX. Studies on the storage of vitamin A and carotenoid pigments by chicks from birth to six weeks, using cyclized vitamin A, vitamin-A alcohol, vitamin-A ester (cod-liver oil) and the pigments of green food and maize as criteria

Published online by Cambridge University Press:  27 March 2009

T. Barton Mann
T. Barton Mann
Affiliation:
Biological Research Laboratory, Weatherstones, Neston, Wirral
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Extract

Studies on the feeding of cyclized vitamin A, vitamin-A alcohol, and vitamin-A ester (as cod-liver oil) to chicks receiving a diet of c. 13% protein content, show that chicks do not assimilate cyclized vitamin A and only begin to assimilate vitamin-A alcohol and vitamin-A ester between the 35th and 42nd day, when the results of analytical methods employed to evaluate carcass and liver stores of these substances are used as criteria, or when growth is used as criterion.

Studies on the feeding of green food and yellow maize, as sources of provitamin A, and vitamin-A alcohol, to chicks receiving a diet of c. 17% protein content, show that chicks do not utilize these substances until between the 35th and 42nd day, when the results of analytical methods are employed as criteria of assessment of vitamin A storage in carcass and liver, or when growth is used as criterion.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 36 , Issue 4 , October 1946 , pp. 289 - 300
Copyright
Copyright © Cambridge University Press 1946

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