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


     

Journal of Dairy Science Vol. 49 No. 1 19-23
© 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 Marquardt, R. R.
Right arrow Articles by Forster, T. L.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Marquardt, R. R.
Right arrow Articles by Forster, T. L.

Variations in Bovine Plasma A-Esterase Activity and the Relationship between Plasma and Milk A-Esterase Activities1, 2,

R. R. Marquardt3 and T. L. Forster

Department of Animal Sciences, Washington State University, Pullman

ABSTRACT

The distribution of plasma A-esterase levels for 83 cows selected from one herd was determined. Some of these values (n = 61) were related with corresponding milk A-esterase levels. Considerable inter- and intrabreed variations in plasma A-esterase levels were observed. Holsteins as a group tended to have higher plasma activities (
Figure 1
= 152 enzyme units, n = 37) than Jerseys and Guernseys (
Figure 2
= 98, n = 19, and
Figure 3
= 110, n = 27, respectively). The standard deviations for plasma A-esterase levels among Holsteins, Jerseys, and Guernseys were 27, 21, and 28 enzyme units, respectively. The average standard deviation in plasma A-esterase levels within individual cows during a four-month period was 12 enzyme units. Milk and plasma A-esterase levels were related (r = 0.56 for 51 cows from three breeds; r = 0.23, n = 26 for Holsteins; r = 0.48, n = 17 for Jerseys; and r = 0.18, n = 18 for Guernseys). The average plasma-to-milk A-esterase ratio was 1,800:1.

FOOTNOTES

1 Scientific Paper no. 2730, College of Agriculture, Washington State University. Work was conducted under Project 1680.

2 Data in this paper are from a thesis submitted by the senior author in partial fulfillment of the requirements for the degree of Doctor of Philosophy.

3 Present address: Department of Chemistry, Washington State University, Pullman, Washington.






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