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


     

Journal of Dairy Science Vol. 55 No. 11 1602-1606
© 1972 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 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 Miller, R. H.
Right arrow Articles by Creegan, M. E.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Miller, R. H.
Right arrow Articles by Creegan, M. E.

Methods of Projecting Complete Lactation Production from Part-Lactation Yield

R. H. Miller, R. E. Pearson, M. H. Fohrman and M. E. Creegan

Animal Science Research Division USDA, ARS, Beltsville, Maryland 20705

ABSTRACT

Four methods of extending lactations-in-progress were compared: ratio, multiple regression, modified regression, and regression of the remainder of the lactation on the last test. Multiple regression estimates and regression estimates on the last test were about equally precise. Modified regression was intermediate while errors of ratio estimates were largest. Present use of ratio extension factors results in excessively large errors in projecting short-length lactation to a 305-day basis.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1972 by the American Dairy Science Association ®.