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Duong Chi, Mai, 2004. Neospora caninum and bovine viral diarrhoea virus infections in dairy cattle : investigation of seroprevalences in imported and local crossbreed cows in dairy herds from southern Vietnam. Second cycle, A1N, A1F or AXX ( AXX). Uppsala: SLU, Dept. of Clinical Sciences

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Abstract

The protozoan parasite Neospora caninum and bovine viral diarrhoea virus (BVDV) are major causes of abortion in cattle and related with economic losses in
many countries. When introduced into a herd, both infections can be expected to remain for a long time if no control measures are taken. The purpose of this study
was to investigate the prevalences of N. caninum and BVDV infections in dairy cows in South Vietnam. Specific goals were to study the seroprevalences of the infections in dairy cows from state herds and smallholder farms, and if there were differences in seroprevalences between imported Holstein Friesian cows and local crossbreeds.

A total of 345 serum samples, including 215 sera collected from 5 state farms and 130 sera from 97 smallholder herds, from southern Vietnam were analysed for presence of antibodies to N. caninum and BVDV. In state herds with imported cows, the N. caninum and BVDV seroprevalences varied between 38-53% and 78-93%, respectively. The infection rates were higher in imported cows than in local
crossbreeds. The results suggested that horizontal transmission of N. caninum was occurring in at least 4 of the 5 herds. Among cows from smallholder herds with
only local crossbreeds, the prevalences of N. caninum and BVDV were 19% and 18%, respectively. BVDV antigen was not found in any cow. This is the first report on BVDV infection in Vietnam.

It was concluded that N. caninum and BVDV infections are present and appear to be widespread in dairy cows in south Vietnam. Given the high prevalence among imported cows found in this study, it seems advisable that only cattle that are pretested free from N. caninum infection are imported into the country. Further, it is important not to import any persistently infected BVDV cattle or antibody positive cows that may carry infected foetuses.

Main title:Neospora caninum and bovine viral diarrhoea virus infections in dairy cattle
Subtitle:investigation of seroprevalences in imported and local crossbreed cows in dairy herds from southern Vietnam
Authors:Duong Chi, Mai
Supervisor:UNSPECIFIED
Examiner:UNSPECIFIED
Series:Report / Master of Science Programme for International Students, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences
Volume/Sequential designation:44
Year of Publication:2004
Level and depth descriptor:Second cycle, A1N, A1F or AXX
Student's programme affiliation:MSCVE Master of Science Programme in Veterinary Medicine 90 HEC
Department:(VH) > Dept. of Clinical Sciences
Keywords:Neospora caninum, BVDV, prevalence, imported cows, local, Vietnam
URN:NBN:urn:nbn:se:slu:epsilon-s-701
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-s-701
Subjects:Animal diseases
Language:English
Additional Information:Överförd från avhandlingsarkivet/Transfered from the Dissertations and Graduate Thesis Archive
Deposited On:11 Nov 2011 14:10
Metadata Last Modified:20 Apr 2012 14:23

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