Somatic cell count, lactoferrin and NAGase activity in milk of infected and non-infected udder halves of dairy goats

Autor: Ute Müller, Karen Aulrich, Kerstin Barth, Karin Knappstein
Rok vydání: 2010
Předmět:
Zdroj: Small Ruminant Research. 94:161-166
ISSN: 0921-4488
DOI: 10.1016/j.smallrumres.2010.07.022
Popis: Based on a repeated sampling the influence of an intramammary infection on the somatic cell count (SCC), the content of lactoferrin (Lf) and the activity of N-acetyl-β- d -glucosaminidase (NAGase) in goats’ milk was investigated. 58 dairy goats (German Improved Fawn) were sampled weekly over 3 consecutive weeks and the udder halves were classified according to the results of the bacteriological analysis of the foremilk samples and the results of their parallel half into three groups: uninfected halves with an uninfected parallel half (NoInf/NoInf), uninfected halves with an infected parallel half (NoInf/Inf) and infected halves with an uninfected parallel half (Inf/NoInf). None of the goats had two infected halves, thus, this group was omitted. 15 out of the 58 goats were infected on one udder half. The bacteria detected were Staphylococcus aureus ( n = 4), coagulase-negative staphylococci ( n = 7), corynebacteria ( n = 3) and esculin-positive streptococci ( n = 1). Log 10 SCC, log 10 Lf and log 10 NAGase were strongly correlated to each other and changed over the sampling period but not uniformly, revealing a significant effect of the sampling day on the variables ( F 6,98 = 29.13, p 10 SCC ( F 2,103 = 20.22, p 10 Lf ( F 2,103 = 11.18, p 10 NAGase ( F 2,103 = 12.06, p 10 SCC ( p 10 Lf ( p 10 NAGase this was different: infected halves differed significantly from NoInf/NoInf ( p Results support the approach to monitor mastitis in goats by means of Lf or NAGase instead of SCC. Further studies should explore the effect of other independent variables, such as estrus, on these indicators and aim for thresholds indicating an intramammary infection.
Databáze: OpenAIRE
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