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


     

J. Anim Sci. 1967. 26:302-306.
© 1967 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 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 Mandigo, R. W.
Right arrow Articles by Whiteman, J. V.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Mandigo, R. W.
Right arrow Articles by Whiteman, J. V.

Some Sources of Variation Associated with Ether Extraction1

R. W. Mandigo2, A. W. Munson3, R. L. Henrickson4 and J. V. Whiteman4

Oklahoma Agricultural Experiment Station, Stillwater

Abstract

Four hundred and thirty-two determinations of ether extractable fat content of beef samples were made. Duplicate determinations at three extraction periods (12, 18 and 24 hr.) on two apparatus repeated six times for each of six levels of fat content were obtained. Each of the six levels was, therefore, determined using 72 aliquots from a ground, homogenized and thoroughly mixed sample. The lean and fat from beef flanks were blended to produce fat contents of 3, 18, 30, 43, 57 and 76%. Extraction time was found to be the most important source of variation associated with the determination. The effect of extraction time on low levels of fat content (3, 18, 30 and 42%) appears to have little influence on the magnitude of the error. At higher levels of fat (57 and 76%) highly significant (P<.01) differences in the errors were found for extraction periods of less than 24 hours. Variances were found to increase greatly with the increasing fat content, and longer extraction only partially reduces the magnitude. The basic technique discussed can be applied to many procedures and apparatus to provide greater knowledge in reference to the precision of the results obtained, and thus the confidence that can be placed in the data.

Footnotes

1 Approved as Journal Manuscript No. 1321 of the Oklahoma Agricultural Experiment Station.

2 Present address: Animal Science Department, University of Nebraska, Lincoln.

3 Present address: Biometrical Service, U.S.D.A., Beltsville, Maryland.

4 Institute of Animal Sciences and Industry, Stillwater, Oklahoma.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1967 by the American Society of Animal Science.