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Titolo:
A SEROLOGICAL SURVEY FOR BOVINE IMMUNODEFICIENCY-LIKE VIRUS IN ONTARIO DAIRY-CATTLE AND ASSOCIATIONS BETWEEN TEST-RESULTS, PRODUCTION RECORDS AND MANAGEMENT-PRACTICES
Autore:
MCNAB WB; JACOBS RM; SMITH HE;
Indirizzi:
UNIV GUELPH,ONTARIO VET COLL,DEPT PATHOL GUELPH N1G 2W1 ON CANADA UNIV GUELPH,ONTARIO VET COLL,DEPT PATHOL GUELPH N1G 2W1 ON CANADA AGR CANADA,ANIM & PLANT HLTH DIRECTORATE NEPEAN K2H 8P9 ON CANADA
Titolo Testata:
Canadian journal of veterinary research
fascicolo: 1, volume: 58, anno: 1994,
pagine: 36 - 41
SICI:
0830-9000(1994)58:1<36:ASSFBI>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
MULTIPLE RETROVIRAL INFECTIONS; WESTERN-BLOT ASSAY; LEUKEMIA-VIRUS; ANTIBODIES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
15
Recensione:
Indirizzi per estratti:
Citazione:
W.B. Mcnab et al., "A SEROLOGICAL SURVEY FOR BOVINE IMMUNODEFICIENCY-LIKE VIRUS IN ONTARIO DAIRY-CATTLE AND ASSOCIATIONS BETWEEN TEST-RESULTS, PRODUCTION RECORDS AND MANAGEMENT-PRACTICES", Canadian journal of veterinary research, 58(1), 1994, pp. 36-41

Abstract

A chemiluminescence Western blot analysis (WBA) for detecting antibovine immunodeficiency-like virus (BIV) antibodies, had good repeatability. The test was subsequently applied to a bank of serum samples from 928 adult cows from 265 herds in Ontario; the number of cows sampled within each herd ranged from 1 to 13. The overall prevalence of anti-BIV antibodies among cows was 5.5% with a 95% confidence interval of 4.2% to 7.2%. In contrast, 18.1% of herds had at least one reactor among cows tested, resulting in a herd-prevalence confidence interval of 13.8% to 23.4%. These estimates of prevalence were in the same range as previous reports from the US and Europe. Bovine immunodeficiency-like virus may have a worldwide distribution. Unfortunately, BIV test sensitivity and specificity are difficult to estimate because virus isolation is inefficient. Therefore, the apparent prevalences could not be adjusted for test sensitivity and specificity, to estimate the true prevalence of infection. The serum samples had previously been tested for antibodies to bovine leukemia virus (BLV). There were no significant associations between BIV and BLV test results. Least squares regression was used to investigate potential associations between BIV test results and selected production indices. After controlling for age and herd size, a positive BIV test result was associated with lower than herd average milk production, as measured by breed class average (BCA) units. Individual cow BIV test results were not associated with deviations from herd-mean somatic cell counts or calving intervals. Logistic regression was used to investigate potential associations between BIV herdclassification and herd management practices. After controlling for herd size, the odds of at least one animal being BIV seropositive amongthose tested per herd, were increased among farms which allowed more contact among dry cows in winter and summer.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 21:54:47