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Effect of caprine arthritis–encephalitis virus infection on milk cell count and N-acetyl-β–glucosaminidase activity in dairy goats

Published online by Cambridge University Press:  01 June 2009

Diane P. Ryan
Affiliation:
New South Wales Agriculture, Elizabeth Macarthur Agricultural Institute, PMB 8, Camden, NSW 2570, Australia
Paul L. Greenwood
Affiliation:
New South Wales Agriculture, Elizabeth Macarthur Agricultural Institute, PMB 8, Camden, NSW 2570, Australia
Paul J. Nicholls
Affiliation:
New South Wales Agriculture, Elizabeth Macarthur Agricultural Institute, PMB 8, Camden, NSW 2570, Australia

Summary

Bacteriology, somatic cell counts (SCO) and N-acetyl-β-glucosaminidase (NAGase) activity determinations were conducted on milk samples collected from does in three dairy herds with caprine arthritis–encephalitis virus (CAEV) infection. In two herds, CAEV-infected does were more likely to have a subclinical bacterial infection of the udder than CAEV-free does (P < 0·05). Does with CAEV but no bacterial udder infection had significantly greater mean SCO and NAGase activity than CAEV-free does without udder infection (P < 0·01). In two herds, changes in milk SCC and NAGase associated with CAEV infection were similar to those produced by coagulase-negative staphylococcal infections. The findings confirm that indirect indicators of bacterial mastitis infection may have reduced specificity in dairy goat herds with CAEV.

Type
Original Articles
Copyright
Copyright © Proprietors of Journal of Dairy Research 1993

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