Use of on-farm testing of somatic cell count for selection of udder quarters for bacteriological culturing

Tine van Werven; Cindy Nijhof; Twan van Bussel; Henk Hogeveen

Use of on-farm testing of somatic cell count for selection of udder quarters for bacteriological culturing

in Mastitis in dairy production

Autor:innen:

Tine van Werven

Tine van Werven ¹Department of Farm Animal Health, Utrecht University, Utrecht, The Netherlands

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Cindy Nijhof

Cindy Nijhof ¹Department of Farm Animal Health, Utrecht University, Utrecht, The Netherlands
²Business Economics, Wageningen University, Wageningen, The Netherlands

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Twan van Bussel

Twan van Bussel ¹Department of Farm Animal Health, Utrecht University, Utrecht, The Netherlands

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, und

Henk Hogeveen

Henk Hogeveen ¹Department of Farm Animal Health, Utrecht University, Utrecht, The Netherlands
²Business Economics, Wageningen University, Wageningen, The Netherlands

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Art:: Kapitel

Seiten:: 481–486

DOI:: https://doi.org/10.3920/9789086865505_073

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In this study the usefulness of direct (Delaval cell counter DCC) and indirect (California mastitis test CMT) measurement of somatic cell count (SCC) to detect an intramammary infection (IMI) caused by a major pathogen was evaluated and compared. Bacteriological culture was the gold standard. The DCC was recently introduced on the market and is an on-farm test to measure directly the SCC in milk. It measures the number of somatic cells in milk in a fast (40 seconds), reliable and precise way. Samples were taken from 131 cows from six herds. Selected cows had two or more consecutive test days with a cow composite SCC higher than 250,000 cells/ml, measured during milk production recording. Quarter milk samples were taken for SCC measurement and bacteriological culturing. Bacteriological culturing of quarter milk samples identified IMI in 19.8% of the quarters. The usefulness of direct and indirect measurement of quarter SCC for screening was evaluated by calculating the sensitivity and specificity for various threshold values. Both methods, direct and indirect measurement of quarter milk SCC showed decreasing sensitivity and increasing specificity at increasing threshold levels. Sensitivity of the direct measurement of SCC (DCC) at the threshold levels of 100.000 and 250.000 cell/ml were higher than the sensitivity of indirect measurement of SCC. Using a threshold of 250,000 cells/ml for direct measurement of SCC in quarter milk, resulted in a sensitivity and specificity for detecting positive bacteriological culturing of 74.4 and 58.1 respectively. Evaluation of the indirect measurement of SCC (using CMT) with a threshold > ++ showed a sensitivity and specificity of 46.3 and 81.9 respectively.

On-farm measurement of SCC in quarter milk is useful to select udder quarters for bacteriological culturing in cows with an increased composite SCC (higher than 250.000 cells/ml) for two consecutive test days. The performance of direct measurement of SCC (using DCC) for this purpose was better than the use of indirect measurement of SCC (using CMT).

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Mastitis in dairy production

Current knowledge and future solutions

ISBN:: 9789086865505

Verleger:: Wageningen Academic

Print-Publikationsdatum:: 24 Oct 2005

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Use of on-farm testing of somatic cell count for selection of udder quarters for bacteriological culturing

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Mastitis in dairy production

Current knowledge and future solutions

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