Differential cell count and interdependence of udder quarters

J. Hamann; A Schröder; R. Merle

Differential cell count and interdependence of udder quarters

in Mastitis in dairy production

Autor:innen:

J. Hamann

J. Hamann ¹Institute for Food Quality and Safety, University of Veterinary Medicine Hannover, Hannover, Germany

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A Schröder

A Schröder ¹Institute for Food Quality and Safety, University of Veterinary Medicine Hannover, Hannover, Germany

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, und

R. Merle

R. Merle ¹Institute for Food Quality and Safety, University of Veterinary Medicine Hannover, Hannover, Germany
¹Institute for Food Quality and Safety, University of Veterinary Medicine Hannover, Hannover, Germany

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Art:: Kapitel

Seiten:: 190–195

DOI:: https://doi.org/10.3920/9789086865505_025

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For many years, there have been reports of indicators for the interdependence of udder quarters within one cow, i.e. compensation of milk yield after loss of one quarter. Despite these reports many studies are nevertheless still based on the hypothesis of quarter independence when using within cow controls. The possibility of communication between udder quarters in an immunological crisis (i.e. mastitis) has not yet been systematically assessed.

The aim of this study was to evaluate the interdependence of udder quarters by microscopic and flow cytometric cell differentiation in milk in light of the fact that somatic cells are agents of the immune system.

The physiological reference comprised 52 quarter milk samples from 13 normally secreting cows monitored from calving until the time of sampling. The samples from 26 mastitic cows were grouped according to their somatic cell counts.

After cell isolation, differential cell counts were conducted both microscopically and by flow cytometric analysis. The latter detected antigens on lymphocytes and on polymorphonuclear neutrophil granulocytes (PMN).

The percentages of lymphocytes (25%), CD4-positive cells (20%), and macrophages were significantly (P < 0.0001) higher in the reference group than in all others. On the other hand, the percentages of PMN (microscopy, 34%) and Bo116-positive cells (flow cytometry, 5%) were significantly lower (P < 0.0001) in the reference group than in all others except one.

These data indicate that the infection and inflammation of one quarter do indeed influence the differential cell counts of the other quarters within the same udder. Therefore, the quarters of one mammary gland cannot be regarded as four isolated units since they communicate with each other and are thus interdependent.

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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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Differential cell count and interdependence of udder quarters

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Mastitis in dairy production

Current knowledge and future solutions

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