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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 ,
Paul L. Greenwood  and
Paul J. Nicholls
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
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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
Information
Journal of Dairy Research , Volume 60 , Issue 3 , August 1993 , pp. 299 - 306
Copyright
Copyright © Proprietors of Journal of Dairy Research 1993

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References

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