JDS
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Journal of Dairy Science Vol. 24 No. 1 57-64
© 1941 by American Dairy Science Association ®
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Johnson, P.
Right arrow Articles by Loosli, J. K.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Johnson, P.
Right arrow Articles by Loosli, J. K.

The Riboflavin Content of Milk as Influenced by Diet1

Paul Johnson, L. A. Maynard and J. K. Loosli

Laboratory of Animal Nutrition, Cornell University, Ithaca, N. F.

ABSTRACT

Experiments with cows, involving 460 determinations made over a period of
Figure 2
months, showed clearly that the riboflavin content of milk can be influenced only to a limited extent by the diet. When cows were transferred from pasture to a ration of natural feeds selected to be very low in riboflavin its content in the milk decreased about 25 per cent. Increasing the riboflavin intake 30 to 50 per cent by feeding a molasses-yeast byproduct caused only a temporary increase in the concentration of riboflavin in the milk. A winter ration consisting of good quality hay, acid grass silage and a grain mixture maintained the milk riboflavin at the pasture level.

Goats fed a riboflavin-free purified diet continued to secrete large amounts of riboflavin in the milk, indicating this factor is not a dietary essential for lactation in the goat. No consistent difference was observed in the milk yield or the riboflavin concentration when the purified diet was supplemented with a molasses-yeast byproduct supplying riboflavin. Likewise, no advantage in milk secreted was noted between a thiamin-deficient purified diet and one adequate in it and other factors of the B-complex.

The data from both cows and goats indicate that there is an inverse relation between the milk yield and the riboflavin concentration of the milk.

FOOTNOTES

1 This study was supported in part by the Cooperative G. L. F. Exchange, Ithaca, N. Y., and by U. S. Industrial Alcohol, New York, X. Y.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1941 by the American Dairy Science Association ®.