Particles in bulk milk capable of causing falsely high electronic cell counts

Author:

Hill Alan W.,Hibbitt Kenneth G.,Davies Jonathon

Abstract

SUMMARYBulk milk with an apparently high electronic cell count (ECC) was found to have a normal cell count when the latter was determined directly with a microscope or when cell nuclei were counted with a Fossomatic apparatus. Particles in the form of collapsed spheres formed by aggregated casein micelles were found in bulk milk which accounted for the falsely high ECC values. The ECC value agreed with the values obtained by the other methods if the milk was heated to 55 °C for 15 min before fixation. The shape of the particles and the fact that they were only present after the milk had passed through the milking machine suggested that they may be produced as vacuum vacuoles arising from cavitation in the pump.

Publisher

Cambridge University Press (CUP)

Subject

Animal Science and Zoology,General Medicine,Food Science

Reference2 articles.

1. Somatic cells in milk: their significance and recommended methods for counting;IDF Bulletin, Document,1979

2. Effects of homogenization on milk plasma;Walstra;Netherlands Milk and Dairy Journal,1980

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