A new method for mastitis diagnosis based on hysteresis threshold of somatic cell count

M.A. Pérez; R. Ortega; R. Muñiz; M.B. Coya

A new method for mastitis diagnosis based on hysteresis threshold of somatic cell count

In: Mastitis control

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M.A. Pérez

M.A. Pérez ¹Dpto. de Ingeniería Eléctrica. University of Oviedo, Campus de Viesques s/n 33203 Gijón, Spain

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R. Ortega

R. Ortega ²Centro Técnico Veterinario La Espina S.L., La Espina, Salas, Spain Corresponding author: maperezg@uniovi.es

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R. Muñiz

R. Muñiz ¹Dpto. de Ingeniería Eléctrica. University of Oviedo, Campus de Viesques s/n 33203 Gijón, Spain

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M.B. Coya

M.B. Coya ¹Dpto. de Ingeniería Eléctrica. University of Oviedo, Campus de Viesques s/n 33203 Gijón, Spain

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Type:: Chapter

Pages:: 235–242

DOI:: https://doi.org/10.3920/9789086866496_045

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From a significant amount of data (more than 200 cases tested by the California Mastitis Test (CMT), microbiological cultures and Video microscopy-Somatic Cell Count (VMSCC)) this paper presents several matters of concern to the sector, such as the instrumental uncertainty of SCC in mastitis diagnosis, doubts about the disease threshold, a not very strong relation between pathogenic agents and counts, and the collection of samples at long intervals – every month, according to the official milk control programs – with regard to the time of the disease evolution. The threshold of 200 cells/μl – curiously, coinciding with the payment for quality in many countries – is very often considered to define whether a cow is diseased or not. This paper refers to the diagnostic capability of SCC, and shows that such a strict threshold does not have much basis. Moving this threshold up or down is not the solution because this moves the problem around. In contrast, we can use an alternative for considering disease based on a threshold with hysteresis in which the value of hysteresis is equal to the measure error. For that aim, the previous situation of the animal is taken into account: when the animal was healthy (low SCC), it would be considered to be diseased only if the SCC clearly exceeded the threshold; in the same way, when it was diseased (high SCC), it would be considered to be cured only if the count descended clearly below the threshold.

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Mastitis control

From science to practice

E-Book ISBN:: 9789086866496

Publisher:: Wageningen Academic

Print Publication Date:: 30 Oct 2008

Subjects
- Life Sciences

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A new method for mastitis diagnosis based on hysteresis threshold of somatic cell count

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Mastitis control

From science to practice

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