Monitoring and surveillance in abattoirs of residues of antibacterial substances – a description of programs in Australia and the USA     

JL CUPIT  NL BLACKMAN†  TJ NICHOLLS†  IB STEPHENS†  RJ WILD 《Australian veterinary journal》1994,71(12):400-403

SUMMARY Australia and the USA are major international meat exporting countries. Both countries conduct programs to monitor and survey for antibacterial residues. Australian programs use a urine screening test, whereas the US programs use tissue fluids as the test medium. The development of surveillance programs to provide rapid feedback to producers is a feature of the Australian programs. The programs in each country compare favourably with regard to numbers of animals tested, results and action taken to prevent residues. The results of the Australian programs justify the promotion of a ‘clean food’ image for Australian meat products with respect to antibacterial drugs.  相似文献   

Anthelmintic resistance in the field: Changes in resistance status of parasitic populations in response to anthelmintic treatment     

PJ WALLER  RJ DOBSON  A. AXELSEN 《Australian veterinary journal》1988,65(12):376-378

Changes in anthelmintic resistance in nematode parasites were monitored in sheep grazing on 2 separate farms, but with the same anthelmintic treatment program, over 16 years. High levels of benzimidazole resistance emerged in Ostertagia and Trichostrongylus spp populations on both farms following 9 years of continuous use of this class of drug. Subsequently, variations in the levels of resistance occurred for the same species between farms and between species on the same farm. A change to levamisole for 2 years resulted in a significant reversion towards benzimidazole susceptibility, but a concomitant rise in levamisole resistance, in Ostertagia on one farm. However, benzimidazole resistance increased rapidly following the re-introduction of oxfendazole into the anthelmintic treatment program. Results from both farms illustrate the pitfalls of using one anthelmintic class for an extended period and provide indirect support for the alternation of anthelmintic classes at approximately yearly intervals.  相似文献   

Feeding practices in Thoroughbred and Standardbred racehorse stables     

LLD SOUTHWOOD  DL EVANS  WL BRYDEN  RJ ROSE 《Australian veterinary journal》1993,70(5):184-185

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Pyrrolizidine alkaloidosis of cattle associated with Senecio lautu     

JW NOBLE  JdeB CROSSLEY  BD HILL†  RJ PIERCE†  RA McKENZIE‡  M. DEBRITZ§  AA MORLEY¶ 《Australian veterinary journal》1994,71(7):196-200

Summary Serious incidents of pyrrolizidine alkaloidosis of cattle in 10 herds exposed to the Australian native plant, Senecio lautus (Asteraceae), were seen in central Queensland during 1988–1992. The deaths of 226 cattle were recorded. A mean of 8% of cattle died in affected groups (range 2 to 58%). Sickness and deaths usually occurred some months after access to S lautus. Typically, affected cattle lost body condition to the point of emaciation before dying and had persistent diarrhoea. Some animals developed abnormal behaviour and died after a shorter illness. Liver specimens from affected cattle in all herds contained lesions consistent with pyrrolizidine alkaloidosis. Thin layer chromatography of extracts of blood and liver samples from cattle from 5 herds detected pyrrolic metabolites. The identity of these was confirmed by mass spectroscopy on samples from one herd. Unseasonal autumn and winter rain after a dry summer appeared to favour growth of S lautus at the expense of other pasture species. A subsequent dry period promoted consumption of S lautus and was followed by a cluster of poisoning incidents.  相似文献   

Relationships between vaccine and virulent strains of Babesia bovis during co-infection in calves     

WK JORGENSEN  PJ JESTON  PM BOWLES  J. CROFT  AE LEW  JB MOLLOY  RJ DALGLIESH 《Australian veterinary journal》1998,76(1):57-58

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Prevalence of exon 11 internal tandem duplications in the C‐KIT proto‐oncogene in Australian canine mast cell tumours          下载免费PDF全文

VS Tamlin  AE Kessell  RJ Mccoy  EC Dobson  TS Smith  M Hebart  L Brown  D Mitrovic  AE Peaston 《Australian veterinary journal》2017,95(10):386-391

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Reply     

RJ DOBSON  RB BESIER  EH BARNES  SCJ LOVE  K BELL  LF Le JAMBRE 《Australian veterinary journal》2002,80(7):438-438

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Congenital hydranencephaly and arthrogryposis of Corriedale sheep     

RJ WHITTINCTON  JRW GLASTONBURY  JW PLANT†  MRW BARRY‡ 《Australian veterinary journal》1988,65(4):124-127

SUMMARY: A syndrome of congenital malformations in Corriedale sheep characterised by brachygnathia inferior, campylognathia, tetraemlic arthrogryposis, kyphoscoliosis, hydranencephaly and hypoplasia of the brain stem, cerebellum and spinal cord occurring in various combinations is described. Histologically there was generalised hypomyelinogenesis and hypoplasia of the central nervous system with neurogenic atrophy of skeletal muscle. The syndrome resembled that caused by congenital infection with Akabane virus, however, serological, pathological and epidemiological data indicated that Akabane virus was not involved. The results of a breeding trial suggested that the disorder may be transmitted with an autosomal recessive mode of inheritance.  相似文献   

Embryo wastage in the ewe following inductionof ovulation with synthetic gonadotrophin releasing hormone (GnRH)     

SK WALKER  RJ LAMPE  TM HEARD  CD MATTHEWS  RF SEAMARK 《Australian veterinary journal》1990,67(11):415-415

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Retropharyngeal pain and swelling in a dog     

GB HUNT  KR YOUMANS  DJ SIMPSON  RJ STEEL 《Australian veterinary journal》1997,75(7):476-476

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