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277. Vitamin A and C in cow's milk, with a note on the synthesis of vitamin C in bovines

Published online by Cambridge University Press:  01 June 2009

S. N. Ray ,
Karam Chand  and
K. Govind Rau
S. N. Ray
Affiliation:
Imperial Veterinary Research Institute, Muktesar, India
Karam Chand
Affiliation:
Imperial Veterinary Research Institute, Muktesar, India
K. Govind Rau
Affiliation:
Imperial Veterinary Research Institute, Muktesar, India
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Extract

1. A simple method is described for the determination of carotene and vitamin A in milk. Figures for the carotene content of milk were higher and those for vitamin A were lower than similar figures reported by Western workers.

2. Figures for vitamin C in milk are similar to corresponding figures of English and American workers. Previous low values for vitamin C, reported by Indian workers, are due to destruction of the vitamin by light.

3. The vitamin C concentration of milk is not subject to great individual variation, probably because cows cannot excrete in milk any vitamin C taken in with the food and because vitamin C of milk is produced by synthesis within the mammary glands from some simple blood constituents.

4. To test the ability of bovines to synthesize vitamin C, young calves were kept for long periods on a strictly vitamin C-free diet. The concentration of vitamin in the blood and other tissues of these animals remained, however, at a normal level. Calves appear therefore to be able to synthesize sufficient vitamin C for their normal growth and activity.

5. Unsuccessful attempts were made to produce vitamin C in vitro by growing bacteria isolated from various parts of the alimentary canal on media prepared from ingesta taken from the regions from which they were isolated.

Type
Original Articles
Information
Journal of Dairy Research , Volume 12 , Issue 2 , May 1941 , pp. 109 - 118
Copyright
Copyright © Proprietors of Journal of Dairy Research 1941

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