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Association of season and herd size with somatic cell count for cows in Irish,English, and Welsh dairy herds

Archer, Simon C.; Mc Coy, Finola; Wapenaar, Wendela; Green, Martin J.

Authors

Simon C. Archer simon.archer@nottingham.ac.uk

Finola Mc Coy finola@animalhealthireland.ie

Wendela Wapenaar wendela.wapenaar@nottingham.ac.uk

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



Abstract

The aims of this study were to describe associations of time of year, and herd size with cow somatic cell count (SCC) for Irish, English, and Welsh dairy herds. Random samples of 497 and 493 Irish herds, and two samples of 200 English and Welsh (UK) herds were selected. Random effects models for the natural logarithm of individual cow test day SCC were developed using data from herds in one sub-dataset from each country. Data from the second sub-datasets were used for cross validation.

Baseline model results showed that geometric mean cow SCC (GSCC) in Irish herds was highest from February to August, and ranged from 111,000 cells/mL in May to 61,000 cells/mL in October. For cows in UK herds, GSCC ranged from 84,000 cells/mL in February and June, to 66,000 cells/mL in October. The results highlight the importance of monitoring cow SCC during spring and summer despite low bulk milk SCC at this time for Irish herds. GSCC was lowest in Irish herds of up to 130 cows (63,000 cells/mL), and increased for larger herds, reaching 68,000 cells/mL in herds of up to 300 cows. GSCC in UK herds was lowest for herds of 130–180 cows (60,000 cells/mL) and increased to 63,000 cells/mL in herds of 30 cows, and 68,000 cells/mL in herds of 300 cows. Importantly, these results suggest expansion may be associated with increased cow SCC, highlighting the importance of appropriate management, to benefit from potential economies of scale, in terms of udder health.

Citation

Archer, S. C., Mc Coy, F., Wapenaar, W., & Green, M. J. (2013). Association of season and herd size with somatic cell count for cows in Irish,English, and Welsh dairy herds. Veterinary Journal, 196(3), https://doi.org/10.1016/j.tvjl.2012.12.004

Journal Article Type Article
Acceptance Date Dec 7, 2012
Online Publication Date Jan 12, 2013
Publication Date Jun 1, 2013
Deposit Date Apr 25, 2014
Publicly Available Date Apr 25, 2014
Journal Veterinary Journal
Print ISSN 1090-0233
Electronic ISSN 1090-0233
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 196
Issue 3
DOI https://doi.org/10.1016/j.tvjl.2012.12.004
Keywords Season; Herd size; Somatic cell count; Dairy cow; Modelling
Public URL http://eprints.nottingham.ac.uk/id/eprint/3043
Publisher URL http://www.sciencedirect.com/science/article/pii/S109002331200531X
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc/4.0





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