摘要:

Aim.To evaluate internal parasite control practices and their effectiveness, and to investigate relationships between indices of parasitism and production outcomes by analysis of data collected during a deer herd health and production profiling project.

ISSN:0048-0169    

DOI:10.1080/00480169.1998.36091

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Aims.To determine the value of pasture iodine, serum thyroxine (T4) and tri-iodothyronine (T3) concentrations and thyroid (g) to body weight (kg) ratios in lambs as criteria to predict and diagnose increased litter size and decreased perinatal mortality in response to iodine supplementation.

ISSN:0048-0169    

DOI:10.1080/00480169.1998.36092

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Aim.To identify the histological changes in the thyroid associated with subclinical goitre.

ISSN:0048-0169    

DOI:10.1080/00480169.1998.36093

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Aim.To compare the bacteriological and clinical cure rates for clinical and subclinical mastitis in New Zealand dairy cows following treatment with either an intramammary penicillin-dihydrosptreptomycin preparation or a subcutaneous injection of penethamate hydriodide.

ISSN:0048-0169    

DOI:10.1080/00480169.1998.36094

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Aims.Canine and feline uroliths were analysed to determine the prevalence of particular types of urolith and the dog breeds at risk.

ISSN:0048-0169    

DOI:10.1080/00480169.1998.36095

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Egg drop syndrome 76 (EDS 76) is a disease of chickens caused by an haemagglutinating group III aviadenovirus (Smyth and McFerran, 1989). Infection with the virus causes a failure to reach peak production in flocks affected prior to 20 weeks of age, or a decline in production of from 10% to 30%, accompanied by the presence of soft- shelled eggs in flocks infected in early lay (McFerranet al., 1978). The disease was reported to have first occurred in the Netherlands in 1974 (van Ecket al., 1976), and the causative agent identified in Northern Ireland in 1976 (McFerranet al., 1978). Antibodies to EDS 76 virus have been detected in duck sera collected prior to 1976 (McFerranet al., 1977), but not chicken sera, and the preference of the virus for duck cells has lead to the suggestion that EDS 76 is a duck adenovirus introduced to chickens, probably via a contaminated vaccine (Smyth and McFerran, 1989). The use of contaminated vaccines in primary breeding stock lead to the dissemination of the virus through chicken populations by vertical transmission, and the first report of EDS 76 in New Zealand commercial egg layers was traced to infection in a parent breeder flock (Howell, 1988). Subsequent reports of EDS 76 in New Zealand were linked with exposure of free-range egg layer flocks to water contaminated by duck faeces (Christensen and Stanislawek, 1994), and in 1995-96 EDS 76 was shown by EDS HI tests to have became established on a number of free-range egg laying fams, despite efforts to limit contact with water contaminated with duck faeces. This is thought to be the method of introduction of infection to the trial farm. These seropositive flocks, including the unvaccinated flocks shown in Figure 1, suffered declines in production typical of EDS 76.

ISSN:0048-0169    

DOI:10.1080/00480169.1998.36096

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

Infectious bovine rhinotracheitis (IBR), parainfluenza type 3 (PI 3), bovine respiratory syncytial (BRS) and bovine coronavirus (BCV) infections are common viral diseases of cattle (Anon, 1990). IBR, PI 3 and BRS viruses have all been incriminated as causes of bovine respiratory disease (Anon, 1990). BCV is one of the agents that causes diarrhoea and occasionally respiratory tract infections of calves and is associated with winter dysentery in adult cattle (Wegeet al., 1982).

ISSN:0048-0169    

DOI:10.1080/00480169.1998.36097

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor

摘要:

In the June 1998 issue of theNew Zealand Veterinay Journal, a clinical review was published focusing on aspects of the protein nutrition of dairy cattle (Westwoodet al., 1998). The authors wrote: “Most species of rumen bacteria can use ammonia for growth, but some, particularly bacteria which ferment cell wall carbohydrates, use or have obligate requirements for amino acids and peptides (Russelet al., 1992)”.

ISSN:0048-0169    

DOI:10.1080/00480169.1998.36098

出版商:Taylor & Francis Group    

年代:1998

数据来源: Taylor