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KMID : 0893420070080030237
Journal of Veterinary Science
2007 Volume.8 No. 3 p.237 ~ p.242
Effect of mastitis on raw milk compositional quality
Ogola Henry

Shitandi Anakalo
Nanua Jackin
Abstract
In this study, we investigated the impact of mastitis infection on the quality of milk composition in small-scale dairy bovine herds. The purpose of this study was to find a milk quality somatic cell count (SCC) standard that could be used as an integral component of a control program. In all, 396 quarter milk samples from lactating cross-bred cows (Holstein & Zebu) were analyzed; 56% of these quarters were experiencing intramammary infection, with an overall mean SCC of 5.46 ¡¿ 105 ¡¾ 2.30 ¡¿ 104cells/ ml. Infected quarters had significantly (p < 0.05) higher mean SCC levels (6.19 ¡¿ 105¡¾ 4.40 ¡¿ 104cells/ml) compared to healthy quarters (2.65 ¡¿ 105 ¡¾ 2.40 ¡¿ 104cells/ml). In high SCC milk and infected quarters, the concentrations of non-casein fractions, sodium, chloride, and free fatty acid were higher (p < 0.05), while the casein content, lactose, casein-to-total protein, potassium, and calcium were lower (p < 0.05) compared to normal quarters. These findings suggest a mean SCC threshold limit of 5.46 ¡¿ 105 cells/ml for the region. It was concluded that the results could be used to propose a milk quality SCC standard that can be used as an integral component of a control program.
KEYWORD
compositional quality, raw milk, small scale somatic cell count, subclinical mastitis
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