J. Anim Sci.
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J. Anim Sci. 1973. 36:994-1000.
© 1973 American Society of Animal Science
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 Google Scholar
Google Scholar
Right arrow Articles by O'Kelley, R. E.
Right arrow Articles by Fontenot, J. P.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by O'Kelley, R. E.
Right arrow Articles by Fontenot, J. P.

Effects of Feeding Different Magnesium Levels to Drylot-Fed Gestating Beef Cows1

R. E. O'Kelley2 and J. P. Fontenot

Virginia Polytechnic Institute and State University,3 Blacksburg 24061

Abstract

Three experiments were conducted with eight gestating Angus cows to study the effects of feeding different magnesium levels at 145, 200 and 255 days gestation. Each trial consisted of a 5-day adjustment period and a 10-day experimental period. The average daily magnesium intake for the cows fed the basal ration was 3.4 grams. Supplemental magnesium was added at levels of 0, 4.1, 8.2 and 16.4 g per day. Blood and urine samples were taken at the end of the adjustment periods and on alternate days during the experimental periods.

At the three stages of gestation, increases in dietary magnesium significantly increased serum magnesium levels. Serum calcium and inorganic phosphorus levels were not consistently altered by the dietary magnesium level. Increases in dietary magnesium significantly increased urinary magnesium values per unit of creatinine. As calculated from regression equations obtained at each stage of gestation for the effect of dietary magnesium on serum magnesium, 8.5, 7.0, and 9.0 g of dietary magnesium would be required per day to maintain serum magnesium levels of 2.0 mg per 100 ml at 155, 200, and 255 days gestation, respectively.

Footnotes

1 Appreciation is expressed to N. O. Price for his assistance in the calcium and magnesium analyses. Pfizer, Inc., Terre Haute, Indiana is asknowledged for supplying vitamin A.

2 Present address: Pfizer, Inc., Terre Haute, Indiana.

3 Department of Animal Science.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1973 by the American Society of Animal Science.