摘要:

The clinical consequences of infections with bovine virus diarrhoea virus (BVDV) were studied in a herd of dairy cattle, where BVDV circulated for approximately 2.5 years. Of the 136 cows that were subject to a primary infection, 129 remained healthy, 5 had mild signs, and 2 became severely ill; 1 of these 2 died from a concurrent puerperal infection. In spite of the predominantly subclinical infection, a gradual decrease of 10% or more in milk production, occurring within 10 days, was observed significantly more often in cows that seroconverted than in cows that did not seroconvert over the same period. Percentages of abortion, stillbirth, and birth of weak calves were not significantly higher in cattle that seroconverted during gestation than in cattle that did not seroconvert during gestation. Abnormal return oestru‐ses after insemination, a possible sign of early embryonic death, and congenital abnormalities were not associated with the BVDV infection. In calves that had ingested colostrum from their seropositive dams, respiratory disease ran a significantly milder course than in calves from seronegative dams. The results indicate that, in addition to the known losses associated with the birth of persistently viraemic offspring, a ‘subclinical’ BVDV infection in a dairy herd may also result in substantial economic losses due to decreased milk yield and more severe respiratory disease in calves.

ISSN:0165-2176    

DOI:10.1080/01652176.1994.9694430

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

A protocol for veterinary herd‐health management is proposed to support veterinary surgeons at their work with growing and finishing pig herds. The protocol is divided into preparation for the herd visit, anamnesis, selection of priority items, clinical investigation, planning, and evaluation.

ISSN:0165-2176    

DOI:10.1080/01652176.1994.9694431

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

In September 1986 an Integrated Quality Control Project (IQC) was started in the Netherlands. Over a period of 2 years a veterinary herd health scheme was applied to 21 growing and finishing pig herds. Information was collected concerning medical treatment, classified as group treatment and individual treatment, clinical observations, and housing factors. The main purpose of this project was to investigate relationships between pathological findings detected at the slaughterhouse and information gathered on the farm.

ISSN:0165-2176    

DOI:10.1080/01652176.1994.9694432

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

The data presented here were obtained using blood samples from 159 healthy, conventionally managed sows from 37 breeding herds. Sows were sampled at weaning and at 4–5 weeks gestation. Paired blood samples were analysed from sows that had a normal pregnancy andsubsequentlyfarrowed.Themean va/ues of serum total protein, albumin and gamma globulin concentration were lower in the blood samples obtained at weaning compared with those obtained at 4–5 weeks gestation. Leucocyte count was higher, mostly as a result of a higher segmented neutrophil count, in the blood samples obtained at weaning compared with those obtained at 4–5 weeks gestation.

ISSN:0165-2176    

DOI:10.1080/01652176.1994.9694433

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

The goal of this investigation was to determine the extent to which owners of companion animals experienced problems with their animals, such as behaviour problems, and to discover their opinion about household problems such as the shedding of hairs and/or feathers. Furthermore, an attempt was made to discover the opinions of owners and non‐owners about social problems such as ‘companion animals make noise’.

ISSN:0165-2176    

DOI:10.1080/01652176.1994.9694434

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor

摘要:

A clustering of generalized malignant lymphoma is reported in a single household of Rottweiler dogs (both parents and three of the four sibling in one litter) and in a breeding pair of unrelated Scottish terriers. In addition, malignant lymphoma of the myocardium was found in three directly related otterhounds (the sire and two sibling offspring). Possible genetic and viral factors in the aetiology of canine malignant lymphoma are discussed.

ISSN:0165-2176    

DOI:10.1080/01652176.1994.9694435

出版商:Taylor & Francis Group    

年代:1994

数据来源: Taylor