Effect of caprine arthritis-encephalitis virus infection on milk cell count and N-acetyl-beta-glucosaminidase activity in dairy goats.
Bacteriology, somatic cell counts (SCC) and N-acetyl-beta-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 SCC 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.
Ryan
D P
DP
New South Wales Agriculture, Elizabeth Macarthur Agricultural Institute, Camden, Australia.
Greenwood
P L
PL
Nicholls
P J
PJ
D000118:Acetylglucosaminidase / Q000032:analysis*; D000818:Animals; D000914:Antibodies, Viral / Q000097:blood; D016088:Arthritis-Encephalitis Virus, Caprine / Q000276:immunology; D001424:Bacterial Infections / Q000150:complications / Q000453:epidemiology / Q000662:veterinary; D002452:Cell Count / Q000662:veterinary; D005260:Female; D015511:Goat Diseases / Q000201:enzymology / Q000473:pathology*; D006041:Goats; D016180:Lentivirus Infections / Q000150:complications / Q000201:enzymology / Q000473:pathology / Q000662:veterinary*; D008413:Mastitis / Q000150:complications / Q000662:veterinary; D008892:Milk / Q000166:cytology* / Q000382:microbiology; D015995:Prevalence
D000914:Antibodies, Viral; D000118:Acetylglucosaminidase