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


     

J. Dairy Sci. 2009. 92:4340-4346. doi:10.3168/jds.2009-2039
© 2009 American Dairy Science Association ®
This Article
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Interpretive Summary
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
Google Scholar
Right arrow Articles by Kudahl, A. B.
Right arrow Articles by Nielsen, S. S.
PubMed
Right arrow PubMed Citation
Right arrow Articles by Kudahl, A. B.
Right arrow Articles by Nielsen, S. S.

Effect of paratuberculosis on slaughter weight and slaughter value of dairy cows

A. B. Kudahl*,1 and S. S. Nielsen{dagger}

* Faculty of Agricultural Sciences, Department of Animal Health, Welfare and Nutrition, University of Aarhus, Blichers Allé 20, PO Box 50, DK-8830 Tjele, Denmark
{dagger} Faculty of Life Sciences, Department of Large Animal Sciences, University of Copenhagen, Grønnegårdsvej 8, DK-1870 Frederiksberg, Denmark

1 Corresponding author: Anneb.Kudahl{at}agrsci.dk

The effect of infection with Mycobacterium avium ssp. paratuberculosis (MAP) on slaughter weight and slaughter value of dairy cows was evaluated. Two data sets were analyzed: 1) recordings from 1,031 cows from herds in a pilot study to control MAP infections, and 2) recordings from 36,455 cows from herds participating in the Danish MAP control program. The effect of stage of MAP infection on carcass weight and slaughter value was assessed by ANOVA. Infection stage was diagnosed by repeated milk antibody ELISA in both data sets. Furthermore, repeated fecal culture was recorded in data set 1 and occurrence of enteritis or enteric edema found at slaughter was recorded in data sets 1 and 2. Compared with presumably unaffected cows with at least 2 ELISA negative tests, slaughter weight and value were reduced by 10 and 17%, respectively, in cows with positive ELISA at slaughter. If the cow was also positive using fecal culture, slaughter weight and value were reduced up to 15 and 31%, respectively. The slaughter weight and value were reduced an additional 20 and 31%, respectively, for cases with recorded enteritis or edema. Thereby, summarized weight losses of up to 31% and slaughter value losses up to 48% occurred. Cows with negative fecal cultures had reduced slaughter results only if they were ELISA-positive in the last 2 tests. Losses of both slaughter weight and slaughter value caused by MAP were more severe than previously estimated. These losses could be predicted by repeated milk ELISA tests with or without confirmation with fecal culture.

Key Words: antibody profile • Mycobacterium avium ssp. paratuberculosis • slaughter weight • slaughter value






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2009 by the American Dairy Science Association ®.