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


     

Journal of Dairy Science Vol. 62 No. 7 1076-1080
© 1979 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 Similar articles in PubMed
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 HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Hidiroglou, M.
Right arrow Articles by Roubos, D.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Hidiroglou, M.
Right arrow Articles by Roubos, D.

25-Hydroxyvitamin D in Plasma of Cattle

M. Hidiroglou1, J. G. Proulx2 and D. Roubos2

Animal Research Institute, Research Branch, Agriculture Canada, Ottawa, Ontario K1A OC6

ABSTRACT

Blood samples from 12 Shorthorn heifers, fed a grass silage ration and housed indoors or outdoors, were assayed for 25-hydroxyvitamin D during 9 mo. There was more in plasma during the summer from the outdoor group, reflecting a greater exposure to ultraviolet light and dermal synthesis of vitamin D, the precursor of 25-hydroxyvitamin D. In another experiment, assays were in four groups of six heifers each; 1) control, 2) single oral dose of 1,000,000 IU vitamin D3, 3) injected intramuscularly with 1,000,000 IU of vitamin D3, and 4) free access to a mineral mixture containing 32,000 IU vitamin D3/kg. In all groups, 2 5-hydroxy vitamin D was higher in plasma in summer than in winter. All heifers given vitamin D had more 25-hydroxyvitamin D in plasma during winter than controls. Animals injected with vitamin D had more 25-hydroxyvitamin D in plasma during part of the winter than those on the other treatments with vitamin D.

FOOTNOTES

1 Contribution No. 824, Animal Research Institute, Ottawa, Ontario K1A OC6.

2 Kapuskasing Experimental Farm, Kapuskasing, Ontario P5N 2X9.




This article has been cited by other articles:


Home page
 J ANIM SCIHome page
K. M. Carnagey, E. J. Huff-Lonergan, S. M. Lonergan, A. Trenkle, R. L. Horst, and D. C. Beitz
Use of 25-hydroxyvitamin D3 and dietary calcium to improve tenderness of beef from the round of beef cows
J Anim Sci, July 1, 2008; 86(7): 1637 - 1648.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1979 by the American Dairy Science Association ®.