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


     

Journal of Dairy Science Vol. 49 No. 2 199-201
© 1966 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 Google Scholar
Google Scholar
Right arrow Articles by Mixner, J. P.
Right arrow Articles by Mather, R. E.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Mixner, J. P.
Right arrow Articles by Mather, R. E.

Relation of Thyroxine Secretion Rate to Body Weight in Growing Female Holstein-Friesian Cattle1

J. P. Mixner, K. T. Szabo2 and R. E. Mather

Department of Animal Sciences, New Jersey Agricultural Experiment Station, Sussex

ABSTRACT

One hundred and one thyroxine secretion rate determinations were made on 36 Holstein-Friesian heifers from birth to 2 yr of age. The experimental design was balanced with respect to age of animals and the season of year in which determinations were made. Thyroxine secretion rates were determined by the chemical thyroxine turn-over method. The covariance analysis of the data was on a log-log basis. The formula representing the relationship between the variables on a within-animal basis was Y = 0.033 X0.640 for the 50– to 550-kg body weight range, where T was total daily thyroxine secretion rate (mg) and X was body weight (kg). The exponent of X indicates that for a 1% increase in body weight there was an increase of 0.64% in total daily thyroxine secretion rate.

FOOTNOTES

1 Paper of the Journal Series, New Jersey Agricultural Experiment Station, Rutgers-The State University, New Brunswick. This study was part of a Northeast Regional Research Project (NE-41, Endocrine Factors Affecting Reproduction and Lactation in Dairy Cattle), a cooperative study involving agricultural experiment stations in the Northeastern Region and supported in part by regional funds of the United States Department of Agriculture.

2 Present address: Smith Kline & French Laboratories, Research and Development, Philadelphia 1, Pennsylvania.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1966 by the American Dairy Science Association ®.