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


     

J. Anim Sci. 1966. 25:955-961.
© 1966 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 Mellin, T. N.
Right arrow Articles by Estergreen, V. L.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Mellin, T. N.
Right arrow Articles by Estergreen, V. L., Jr.

Urinary Excretion of Estrogen by the Bovine before and after Parturition1

T. N. Mellin2, R. E. Erb and V. L. Estergreen, Jr.3

Purdue University, Lafayette, Indiana, and Washington State University, Pullman

Abstract

Total urine was collected from six cows at 8-hr. intervals beginning 3 days before expected parturition and continuing for a maximum of 52 hr. postpartum. Twelve 8-hr. interval samples of urine were collected from each cow (72 samples). Average excretion of 17 ß-estradiol, 17 {alpha}-estradiol, estrone and estriol was 39±6, 386±23, 226±10 and 24±2 mcg./hr. per 100 kg. of live weight, respectively. Excluding estriol, which was not unequivocally identified, the total excretion of the three identified estrogens was significantly higher during the 8-hr. interval in which parturition occurred than 32, 40 and 48 hr. after calving (P<.01) and 40 hr. before calving (P<.05). The respective percent increases in estrogen excretion from 40 hr. before calving, compared with the 24-hr. average centered around calving, were 18, 29, 28 and 29% for 17 ß-estradiol, 17 {alpha}-estradiol, estrone and total; similarly, the decreases 48 hr. after calving were 55, 57, 55 and 56%, respectively. Although the quantity of estrogens excreted varied considerably between cows, breeds and intervals, the proportion of each estrogen as a part of the total tended to remain constant between intervals and characteristic for individual cows. Averages were 6.3, 58.7 and 35.0% of the three-estrogen total, respectively, for 17 ß-estradiol, 17 {alpha}-estradiol and estrone.

Footnotes

1 Journal Paper No. 2764, Purdue University Agricultural Experiment Station. This work, partially supported by Grant No. 3555, Purdue Research Foundation, was taken in part from the Ph.D. Thesis of T. N. Mellin, Department of Animal Sciences, Purdue University.

2 Fellow, Purdue Research Foundation. Present address: Merck Institute for Therapeutic Research Railway New Jersey.

3 Washington State University, Pullman, Washington.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1966 by the American Society of Animal Science.