Journal of Applied Physiology
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J Appl Physiol 10: 98-102, 1957;
8750-7587/57 $5.00
This Article
Right arrow Full Text (PDF)
Right arrow Submit a response
Right arrow Alert me when this article is cited
Right arrow Alert me when eLetters are posted
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
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
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Conrad, H. R.
Right arrow Articles by Hansard, S. L.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Conrad, H. R.
Right arrow Articles by Hansard, S. L.

Effects of Massive Doses of Vitamin D on Physiological Behavior of Calcium in Cattle

H. R. Conrad 1 and Sam L. Hansard 1

1 From the University of Tennessee-Atomic Energy Commission, Agricultural Research Program, Oak Ridge, Tennessee

Tracer doses of calcium-45 were used as markers in conjunction with balance trials, blood and tissue distribution studies with paired Hereford calves to assess changes in calcium metabolism when 5 million units of vitamin D were fed for 5-day period. The true digestibility of calcium was increased, denoting increased absorption and confirming the findings reported by others. Increased absorption due to vitamin D feeding was accompanied by several related effects, including decreased endogenous fecal losses, a transitory increase in absorbed radiocalcium in the blood, more rapid movement of radiocalcium through the plasma, a threefold increase in net calcium retention and increased deposition of radiocalcium in areas of new bone growth. Extended feeding of vitamin D for two additional 5-day periods produced no apparent deleterious effect on calcium metabolism. Increased calcium concentration in the kidney and esophagus was observed but had disappeared after 8 days of vitamin D feeding. Autoradiographs of femur bone sections indicated that deposited radiocalcium in the areas of new bone growth was exchanged more rapidly under conditions of extended vitamin D feeding. Analytical data supported these observations.

Submitted on June 22, 1956




This article has been cited by other articles:


Home page
 J ANIM SCIHome page
J. L. Montgomery, M. L. Galyean, R. L. Horst, K. J. Morrow Jr., J. R. Blanton Jr., D. B. Wester, and M. F. Miller
Supplemental vitamin D3 concentration and biological type of beef steers. I. Feedlot performance and carcass traits
J Anim Sci, July 1, 2004; 82(7): 2050 - 2058.
[Abstract] [Full Text] [PDF]

Home page
 J ANIM SCIHome page
J. L. Montgomery, M. B. King, J. G. Gentry, A. R. Barham, B. L. Barham, G. G. Hilton, J. R. Blanton Jr., R. L. Horst, M. L. Galyean, K. J. Morrow Jr., et al.
Supplemental vitamin D3 concentration and biological type of steers. II. Tenderness, quality, and residues of beef
J Anim Sci, July 1, 2004; 82(7): 2092 - 2104.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Visit Other APS Journals Online