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Titolo:
Time to first calving and calving interval in bovine virus diarrhoea virus(BVDV) sero-converted dairy herds in Norway
Autore:
Valle, PS; Martin, SW; Skjerve, E;
Indirizzi:
GENO Breeding & AI Assoc, N-2300 Hamar, Norway GENO Breeding & AI Assoc Hamar Norway N-2300 Assoc, N-2300 Hamar, Norway TINE Norwegian Dairies BA, N-0133 Oslo, Norway TINE Norwegian Dairies BA Oslo Norway N-0133 ies BA, N-0133 Oslo, Norway Norwegian Sch Vet Sci, Dept Large Anim Clin Sci, Sect Prevent Vet Med, N-0033 Oslo, Norway Norwegian Sch Vet Sci Oslo Norway N-0033 nt Vet Med, N-0033 Oslo, Norway Univ Guelph, Ontario Vet Coll, Dept Populat Med, Guelph, ON N1G 2W1, Canada Univ Guelph Guelph ON Canada N1G 2W1 ulat Med, Guelph, ON N1G 2W1, Canada Norwegian Sch Vet Sci, Dept Pharmacol Microbiol & Food Hyg, Sect Food Hyg,N-0033 Oslo, Norway Norwegian Sch Vet Sci Oslo Norway N-0033 ct Food Hyg,N-0033 Oslo, Norway
Titolo Testata:
PREVENTIVE VETERINARY MEDICINE
fascicolo: 1-2, volume: 51, anno: 2001,
pagine: 17 - 36
SICI:
0167-5877(20010920)51:1-2<17:TTFCAC>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
GENERALIZED LINEAR-MODELS; REPRODUCTIVE-PERFORMANCE; MUCOSAL DISEASE; EARLY-PREGNANCY; INFECTION; CATTLE; ANTIBODIES; CALVES; MILK; PREVALENCE;
Keywords:
bovine virus diarrhoea; cattle-microbiological disease; reproduction; generalised estimating equation; multilevel modelling;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
72
Recensione:
Indirizzi per estratti:
Indirizzo: Valle, PS Norwegian Sch Vet Sci, Post Box 2038, N-6402 Molde, Norway Norwegian Sch Vet Sci Post Box 2038 Molde Norway N-6402 Norway
Citazione:
P.S. Valle et al., "Time to first calving and calving interval in bovine virus diarrhoea virus(BVDV) sero-converted dairy herds in Norway", PREV VET M, 51(1-2), 2001, pp. 17-36

Abstract

Dairy herds in More and Romsdal County, Norway (regarded as initially freefrom the bovine virus diarrhoea virus (BVDV) infection) were studied retrospectively from 1992 to 1996. The herd reproductive performance (time to first calving, calving interval, and number of breeding services) was investigated for a potential effect of BVDV sero-conversion. The herd culling pattern possibly affecting the above measurements - was included for investigation. Two different statistical models were used: the generalised estimatingequation (GEE) method and multilevel modelling using Gibbs sampling. Though slightly different estimates resulted, both models agreed on an effect of BVDV in the second year after sero-conversion on the herd average time to first calving by - on an average 14-16 days. In subsets of case herdstesting positive for BVDV antibodies among young stock, the impact on timeto first calving tended to be more pronounced by an additional increase ofIS days. No effect on the number of breeding services for heifers or cows was observed (indicating a need to search for other determinants than reduced conception risk). There appeared to be no effect of BVDV on the herd average calving interval. There was a tendency for a higher risk for reporting animals lost/died in sero-converted herds, which we believe might be related to the occurrence of mucosal disease (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 08/04/20 alle ore 06:47:17