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


     

J. Anim Sci. 1970. 30:420-423.
© 1970 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 Walls, J. R.
Right arrow Articles by Jacobson, D. R.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Walls, J. R.
Right arrow Articles by Jacobson, D. R.

Skin Temperature and Blood Flow in the Tail of Dairy Heifers Administered Extracts of Toxic Tall Fescue1

J. R. Walls2 and Don R. Jacobson

University of Kentucky, Lexington

Abstract

Average skin temperature 3.8 cm from the distal end of the tails of four heifers for 10 days was 27.1 C while they were standing at 15.6 C room temperature and 36.1 C while standing at 34.8 C room temperature. Heart rate was 59.3 beats per min. and respiration rate was 30.5 respirations per min. at 15.6 C room temperature, and 75.9 and 74.2, respectively, at 34.8 C room temperature. The 15.6 C room temperature was selected for further study of blood flow and skin temperature responses to toxic extracts because of the greater difference between room temperature and skin temperature. Repeated observations of blood flow by mercury-in-rubber strain gauges and plethysmographic technique averaged 11.1 cc blood per 100 cc tail tissue per minute at 15.6 C room temperature. Six different fractions of tall fescue were administered to each of two or three animals. Five of the six extracts decreased heart rate in a room at 15.6 C. Decreases in tail skin temperature were associated with decreases in blood flow through the tail.

Footnotes

1 Published with the approval of the Director of the Kentucky Agricultural Experiment Station as Journal Article No. 68-5-12. The authors gratefully acknowledge the preparation of fescue extracts by S. G. Yates and H. L. Tookey of the Northern Regional Research Laboratory, Northern Utilization Research and Development Division, A.R.S., U.S.D.A., Peoria, Illinois.

2 Present address: Cooperative Extension Area Office, Falmouth, Kentucky 41041.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1970 by the American Society of Animal Science.