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


     

Journal of Dairy Science Vol. 85 No. 5 1119-1126
© 2002 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 HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Cook, N. B.
Right arrow Articles by Nordlund, K. V.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Cook, N. B.
Right arrow Articles by Nordlund, K. V.

Monitoring Nonlactating Cow Intramammary Infection Dynamics Using DHI Somatic Cell Count Data

N. B. Cook 1, T. B. Bennett 2, K. M. Emery 1, and K. V. Nordlund 1

1 School of Veterinary Medicine, University of Wisconsin-Madison, Madison, WI 53706
2 School of Veterinary Medicine, University of Wisconsin-Madisonm, Madison, WI 53706

Although the nonlactating period presents a risk for intramammary infection, efficient systems to monitor infection status of recently calved cows have not been developed, and benchmarks for interpretation have not been established. Individual cow somatic cell count (SCC) data for the current and previous six monthly Dairy Herd Improvement milk tests and the last SCC of the previous lactation and first SCC of the current lactation were summarized for all milking cows in a selection of Wisconsin dairy herds. Prevalence of infection, herd new infection rate, fresh cow contribution to herd new infection rate, dry cow new infection rate, heifer new infection rate, and dry cow cure rate were estimated using a threshold of 200,000/ml. In 145 herds, mean (range) heifer new infection rate was 21.3% (0 to 58%). The cut-point for the 10th percentile of herds was 8%. Mean (range) dry cow new infection rate in cows that were uninfected at the last test before dry off was 22.4% (0 to 71%), and the cut-point for the 10th percentile of herds was 9%. Although nonlactating cow and heifer new infection rates increased with weighted 6-mo mean herd SCC, the between-herd variation was large, suggesting that on-farm factors are important in determining the rates of infection.

In a subset of 51 Wisconsin dairy herds, significant monthly variation in weighted SCC, prevalence, herd new infection rate, and fresh cow contribution to herd new infection rate were detected. Elevations in SCC and prevalence of infection during the summer (July through September) were associated with significant increases in fresh cow and herd new infection rates.

Key Words: nonlactating period • somatic cell count • new infection • monthly variation

Submitted on May 21, 2001
Accepted on December 12, 2001




This article has been cited by other articles:


Home page
 J DAIRY SCIHome page
M. J. Green, A. J. Bradley, G. F. Medley, and W. J. Browne
Cow, Farm, and Herd Management Factors in the Dry Period Associated with Raised Somatic Cell Counts in Early Lactation
J Dairy Sci, April 1, 2008; 91(4): 1403 - 1415.
[Abstract] [Full Text] [PDF]

Home page
 J DAIRY SCIHome page
N. Lacetera, U. Bernabucci, D. Scalia, L. Basirico, P. Morera, and A. Nardone
Heat Stress Elicits Different Responses in Peripheral Blood Mononuclear Cells from Brown Swiss and Holstein Cows
J Dairy Sci, December 1, 2006; 89(12): 4606 - 4612.
[Abstract] [Full Text] [PDF]

Home page
 J DAIRY SCIHome page
K. Stanford, D. Croy, S. J. Bach, G. L. Wallins, H. Zahiroddini, and T. A. McAllister
Ecology of Escherichia coli O157:H7 in Commercial Dairies in Southern Alberta
J Dairy Sci, December 1, 2005; 88(12): 4441 - 4451.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 2002 by the American Dairy Science Association ®.