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Titolo:
NATURAL INFECTION WITH BOVINE VIRUS DIARRHEA VIRUS IN A DAIRY-HERD - A SPECTRUM OF SYMPTOMS INCLUDING EARLY REPRODUCTIVE FAILURE AND RETAINED PLACENTA
Autore:
LARSSON B; NISKANEN R; ALENIUS S;
Indirizzi:
NATL VET INST,DIV EPIZOOTIOL S-75007 UPPSALA SWEDEN SWEDISH UNIV AGR SCI,DEPT CATTLE & SHEEP DIS S-75007 UPPSALA SWEDEN NATL VET INST,DEPT VIROL S-75123 UPPSALA SWEDEN
Titolo Testata:
Animal reproduction science
fascicolo: 1-2, volume: 36, anno: 1994,
pagine: 37 - 48
SICI:
0378-4320(1994)36:1-2<37:NIWBVD>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
MUCOSAL DISEASE; WINTER DYSENTERY; CATTLE; FETAL; IMMUNOTOLERANT; CORONAVIRUS; ANTIBODIES; OUTBREAK; ASSAY; COWS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
26
Recensione:
Indirizzi per estratti:
Citazione:
B. Larsson et al., "NATURAL INFECTION WITH BOVINE VIRUS DIARRHEA VIRUS IN A DAIRY-HERD - A SPECTRUM OF SYMPTOMS INCLUDING EARLY REPRODUCTIVE FAILURE AND RETAINED PLACENTA", Animal reproduction science, 36(1-2), 1994, pp. 37-48

Abstract

The consequences of natural infections by bovine virus diarrhoea virus (BVDV) in a dairy herd comprising approximately 60 cows were studiedover a 3 year period. The outcome of 39 pregnancies after artificial insemination or natural service during a 4 month period of risk for contracting BVDV was nine abortions, one mummified foetus, one still-birth, three calves that died within 1 week of age, 12 calves persistently infected (PI) with BVDV (11 males and one female) and 13 non-PI calves. Retrospective studies showed that only two of the 13 dams (15.4%) of non-PI calves had been inseminated once, which is a significantly (P<0.001) lower rate than for 192 other gestations (66.7%) during the 3year period. The gestational duration of multiparous cows (but not ofheifers) was longer (P<0.01) for five cows with PI calves (mean +/- SD 287.6 +/- 9.5 days) than for 53 other gestations in 35 cows (280.6 +/- 3.8 days). Five of the 12 dams of the PI calves had not expelled the foetal membranes within 2 days after calving, which is a higher (P<0.001) incidence than the seven cases of retained placenta observed after 198 other calvings. Furthermore, there was a 4.4-fold higher risk (P<0.01) of treatment for enteritis and/or pneumonia in calves and a 6.0-fold higher risk of calf mortality associated with the introduction of BVDV. The mean heart girth of the PI calves was less (P<0.05) than that of non-PI calves, at both 80 and 180 days of age.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 14:11:53