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Cow, farm, and herd management factors in the dry period associated with raised somatic cell counts in early lactation

Green, Martin J.; Medley, Graham F.; Browne, William J.; Bradley, Andrew J.

Authors

MARTIN GREEN martin.green@nottingham.ac.uk
Professor of Cattle Health & Epidemiology

Graham F. Medley

William J. Browne

ANDREW BRADLEY andrew.bradley@nottingham.ac.uk
Professor of Dairy Herd Health and Production



Abstract

This study investigated cow characteristics, farm facilities, and herd management strategies during the dry period to examine their joint influence on somatic cell counts (SCC) in early lactation. Data from 52 commercial dairy farms throughout England and Wales were collected over a 2-yr period. For the purpose of analysis, cows were separated into those housed for the dry period (6,419 cow-dry periods) and those at pasture (7,425 cow-dry periods). Bayesian multilevel models were specified with 2 response variables: ln SCC (continuous) and SCC >199,000 cells/mL (binary), both within 30 d of calving. Cow factors associated with an increased SCC after calving were parity, an SCC >199,000 cells/mL in the 60 d before drying off, increasing milk yield 0 to 30 d before drying off, and reduced DIM after calving at the time of SCC estimation. Herd management factors associated with an increased SCC after calving included procedures at drying off, aspects of bedding management, stocking density, and method of pasture grazing. Posterior predictions were used for model assessment, and these indicated that model fit was generally good. The research demonstrated that specific dry-period management strategies have an important influence on SCC in early lactation.

Citation

Green, M. J., Medley, G. F., Browne, W. J., & Bradley, A. J. (2008). Cow, farm, and herd management factors in the dry period associated with raised somatic cell counts in early lactation. Journal of Dairy Science, 91(4), doi:10.3168/jds.2007-0621

Journal Article Type Article
Publication Date Apr 1, 2008
Deposit Date Apr 21, 2010
Publicly Available Date Apr 21, 2010
Journal Journal of Dairy Science
Print ISSN 0022-0302
Electronic ISSN 0022-0302
Publisher American Dairy Science Association
Peer Reviewed Peer Reviewed
Volume 91
Issue 4
DOI https://doi.org/10.3168/jds.2007-0621
Keywords mastitis, somatic cell count, dry period, Bayesian multilevel model
Public URL http://eprints.nottingham.ac.uk/id/eprint/1276
Publisher URL http://dx.doi.org/10.3168/jds.2007-0621
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf

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Dry_Period_and_SCC_JDS_Final_Open_Access_Version.pdf (208 Kb)
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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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