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


     

Journal of Dairy Science Vol. 78 No. 8 1837-1842
© 1995 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 Weiss, W. P.
Right arrow Articles by Steiner, T. E.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Weiss, W. P.
Right arrow Articles by Steiner, T. E.

Effect of Forage to Concentrate Ratio on Disappearance of Vitamins A and E During In Vitro Ruminal Fermentation

W. P. Weiss 1, K. L. Smith 1, J. S. Hogan 1, and T. E. Steiner 1

1 Department of Dairy Science, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster 44681

The effects of forage to concentrate ratio and the commercial form of vitamins A and E on in vitro ruminal disappearance of retinol and alpha-tocopherol were studied. Ruminally fistulated cows were fed diets with either 80 or 50% forage. In vitro substrates that were similar to those fed to the donor cows were incubated with buffered ruminal fluid for 24 h. Different commercial forms of vitamin E (spray-dried, silicic acid adsorbate, and lipid-encased forms) and vitamin A (gelatin beadlet and lipid-encased forms) were added to the flasks. The vitamin E was all-rac-alpha-tocopheryl acetate, and the vitamin A was all-trans-retinyl acetate. The amount of alpha-tocopherol in the flasks was not affected by diet or form of vitamin E and did not change over the 24-h incubation. Retinol disappearance was not affected by form of vitamin A but was substantially higher for the 50% forage diet than for the 80% forage diet (72 vs. 20% at 24 h). These data suggest that ruminal metabolism of vitamin E is minimal and not affected by forage to concentrate ratio. Additionally, vitamin A destruction in the rumen was much higher when cows were fed a typical lactation diet than when fed a typical dry cow diet.

Key Words: vitamin A • vitamin E • rumen

Submitted on September 22, 1994
Accepted on March 10, 1995




This article has been cited by other articles:


Home page
 J ANIM SCIHome page
M. A. Gorocica-Buenfil, F. L. Fluharty, C. K. Reynolds, and S. C. Loerch
Effect of dietary vitamin A concentration and roasted soybean inclusion on marbling, adipose cellularity, and fatty acid composition of beef
J Anim Sci, September 1, 2007; 85(9): 2230 - 2242.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
C. E. Alosilla Jr., L. R. McDowell, N. S. Wilkinson, C. R. Staples, W. W. Thatcher, F. G. Martin, and M. Blair
Bioavailability of vitamin A sources for cattle
J Anim Sci, May 1, 2007; 85(5): 1235 - 1238.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1995 by the American Dairy Science Association ®.