J Vet Sci.  2007 Sep;8(3):237-242. 10.4142/jvs.2007.8.3.237.

Effect of mastitis on raw milk compositional quality

• Ogola H
• Shitandi A
• Nanua J

• KMID: 1090797
• DOI: http://doi.org/10.4142/jvs.2007.8.3.237

Abstract

In this study, we investigated the impact of mastitisinfection on the quality of milk composition in small-scaledairy bovine herds. The purpose of this study was to finda milk quality somatic cell count (SCC) standard thatcould be used as an integral component of a controlprogram. In all, 396 quarter milk samples from lactatingcross-bred cows (Holstein & Zebu) were analyzed; 56% ofthese quarters were experiencing intramammary infection,with an overall mean SCC of 5.46x10(5)+/-2.30x10(4)cells/ml. Infected quarters had significantly (p<0.05) highermean SCC levels (6.19x10(5)+/-4.40x10(4)cells/ml) comparedto healthy quarters (2.65x10(5)+/- 2.40x10(4)cells/ml). Inhigh SCC milk and infected quarters, the concentrationsof non-casein fractions, sodium, chloride, and free fattyacid were higher (p<0.05), while the casein content,lactose, casein-to-total protein, potassium, and calciumwere lower (p<0.05) compared to normal quarters. Thesefindings suggest a mean SCC threshold limit of 5.46x10(5)cells/ml for the region. It was concluded that the resultscould be used to propose a milk quality SCC standard thatcan be used as an integral component of a control program.

Keyword

compositional quality; raw milk; small scalefarms; somatic cell count; subclinical mastitis

MeSH Terms

Animals
Cattle
Cell Count
Cross-Sectional Studies
Dairying
Female
Mastitis, Bovine/*metabolism/microbiology
Milk/chemistry/*metabolism/microbiology
Rural Population
Statistics, Nonparametric

Figure

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  Fig. 1 The correlations between SCC and acid degree value (ADV) in quarter milk samples.

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  Fig. 2 The correlations between SCC and selected protein component contents in the quarter milk samples.

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  Fig. 3 The correlation between SCC and Na content in quarter milk samples.

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