Publications

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effect of climatic region on the clinical expression of footrot of lesser clinical severity (intermediate footrot) in sheep.to determine if the clinical classification of intermediate footrot (ifr) is changed to virulent footrot (vfr) by a transfer of the infected flock to a region where climatic conditions are more favourable for the transmission of the disease.200315080488
culture of pooled tissues for the detection of mycobacterium avium subsp paratuberculosis infection in individual sheep. 200315080490
specificity of absorbed elisa and agar gel immuno-diffusion tests for paratuberculosis in goats with observations about use of these tests in infected goats.to determine the specificity of serological tests that are currently used in veterinary diagnostic laboratories in australia for detection of mycobacterium avium subsp paratuberculosis infection in goats.200315084016
prevalence of caseous lymphadenitis and usage of caseous lymphadenitis vaccines in sheep flocks.to estimate the prevalence of caseous lymphadenitis (cla), determine the current usage of vaccines against cla and to measure the effectiveness of these vaccines on sheep farms.200315084020
eradication of footrot of lesser clinical severity (intermediate footrot).to determine if intermediate footrot (ifr) can be eradicated from a flock of sheep by inspection and culling of cases during a non-transmission period and if prior antibiotic treatment or vaccination increases the likelihood of eradication.200315086111
surgical method for biopsy of terminal ileum and mesenteric lymph node of sheep for detection of mycobacterium avium subsp paratuberculosis. 200415088979
cross-sectional study of risk factors for the clinical expression of ovine johne's disease on new south wales farms.to explore the environmental and management risk factors that promote the clinical expression of ovine johne's disease on farms in new south wales.200415267095
field evaluation of tracer sheep for the detection of early natural infection with mycobacterium avium subsp paratuberculosis.to determine whether tracer sheep could be used to detect s strain mycobacterium avium subsp paratuberculosis on pasture, and to provide further insight into the early stages of infection.200415354852
intrauterine and transmammary transmission of mycobacterium avium subsp paratuberculosis in sheep.to investigate intrauterine infection of foetuses with mycobacterium avium subsp paratuberculosis and the presence of infection in mammary secretions of sheep.200415359967
longitudinal study of the spread of ovine johne's disease in a sheep flock in southeastern new south wales.the aim of this study was to apply whole flock testing over time to determine the prevalence, distribution and spread of infection in a recently infected flock, with a view to planning intervention strategies for disease control.200515907043
rapid identification of virulence genes in enterotoxigenic escherichia coli isolates associated with diarrhoea in queensland piggeries.to identify virulence genes in enterotoxigenic e coli (etec) isolates associated with diarrhoea in neonatal, 1 to 3 week-old and weaned pigs in southeast queensland.200515957392
a preliminary study of possible genetic influences on the susceptibility of sheep to johne's disease.to investigate possible genetic influences on susceptibility or resistance of sheep to johne's disease.200516035186
no evidence of endemic borna disease virus infection in australian horses in contrast with endemic infection in other continents.borna disease virus (bdv) is a unique rna virus that is a cause of neurological disease in horses, sheep and cats. the finding that bdv also infects humans has raised concern related to the impact of infection with this virus. the extent to which bdv may be endemic in geographical regions outside europe is of interest in management of international movement of animals including horses. sera from australian horses (n = 553) sampled in sydney, new south wales (nsw), were analysed for bdv antigen, ...200616328145
family conflict in dementia: prodigal sons and black sheep.to describe family conflict in cases of dementia referred to the guardianship tribunal of new south wales, australia.200616676295
lesions attributed to vaccination of sheep with gudair for the control of ovine paratuberculosis: post farm economic impacts at slaughter.to determine i) the prevalence of lesions at the site of vaccination with gudair, and ii) the incidence of discounting of slaughtered sheep carcasses due to the presence of these lesions.200717397381
increasing heel skin perfusion by elevation.to determine the efficacy of elevation in the primary prevention and treatment of pressure ulcers by studying the blood flow in tissue at risk of ulceration.200818156828
training in animal handling for veterinary students at charles sturt university, australia.charles sturt university in new south wales, australia, is responding to a national need for veterinarians with the skills and attributes to fulfill roles in rural practice and the large-animal industries. rural practitioners must competently and confidently handle a range of large animals if they are to build a relationship of mutual trust with clients and deliver effective animal-health services. training in animal handling begins in the first year of the course with highly structured small-gr ...200718326765
cross species transmission of ovine johne's disease from sheep to cattle: an estimate of prevalence in exposed susceptible cattle.to determine the prevalence of infection of cattle with the sheep strain of mycobacterium avium subsp paratuberculosis at least two years after exposure at < 6 months old.200818363982
cerebellar ataxia in sheep grazing pastures infested with romulea rosea (onion grass or guildford grass).there have been anecdotal reports since 1962 of 'staggers' in sheep grazing romulea rosea infested pastures, but this is the first detailed account. in september 2005, a locomotor disorder developed in 12 of 120 merino wethers that had grazed r. rosea infested pasture at albury, new south wales, over several months. affected sheep displayed signs that included limb paresis, knuckling over in the fetlocks, fine head tremor, incoordination, and an equilibrium disturbance characterised by frequent ...200818782418
financial modelling of the potential cost of ovine johne's disease and the benefit of vaccinating sheep flocks in southern new south wales.to develop an enterprise gross margin (gm) model that predicts the on-farm financial impact of ovine johne's disease (ojd) for various sheep enterprises in australia. in addition, to estimate the benefits and costs of control through the use of the gudair vaccination, including a breakeven point.200818826512
estimated intakes of meat and fish by children and adolescents in australia and comparison with recommendations.long-chain n-3 pufa are considered important for cardiovascular health and brain development. meat other than fish contributes significantly to total intakes of long-chain n-3 pufa in adults; however, there are limited published data examining the intake of individual meat sources in children and adolescents in the australian population. a review of literature was conducted using pubmed, agricola and cab abstracts using the terms 'intake', 'beef', 'lamb', 'pork', 'poultry', 'fish', 'children' an ...200919055853
availability of gastro-intestinal nematode larvae to sheep following winter contamination of pasture with six nematode species on the northern tablelands of new south wales.this experiment was designed to determine the infective consequences of winter pasture contamination by sheep infected with 6 species of trichostrongylid gastro-intestinal nematode (gin) at armidale in the new england region of nsw. ten helminthologically inert pasture plots were contaminated using 'donor' sheep harbouring artificial infections of haemonchus contortus, trichostrongylus colubriformis, trichostrongylus vitrinus, trichostrongylus axei, nematodirus spathiger and teladorsagia circumc ...200919070435
the relative contributions of t. colubriformis, t. vitrinus, t. axei and t. rugatus to sheep infected with trichostrongylus spp. on the northern tablelands of new south wales.this survey was designed to determine the spatial and temporal distribution and the relative contributions of trichostrongylus colubriformis, trichostrongylus vitrinus, trichostrongylus axei and trichostrongylus rugatus to sheep infected with trichostrongylus spp. on the northern tablelands of nsw. thirty completed larval cultures were collected from a commercial parasitology laboratory servicing the northern tablelands of nsw between june and december 2007. cultures were selected at random from ...200919632782
undergraduate veterinary students' perceptions of the usefulness, focus, and application of epidemiology before and after epidemiology courses.student perception of the relevance of a topic is known to influence learning outcomes. to determine student perceptions of the usefulness, focus, and application of epidemiology, we conducted a study at two australian veterinary schools in 2005. veterinary students in year 3 at the university of sydney and in year 5 at the university of queensland completed a self-administered questionnaire at the commencement and conclusion of an epidemiology course. at both universities, while over 95% of stu ...200920054079
the first report of ovine cerebral neosporosis and evaluation of neospora caninum prevalence in sheep in new south wales.presence of neospora caninum dna was detected in the brain and spinal cord of an adult merino sheep suspected of dying with acute non-suppurative meningoencephalitis and mild to moderate non-suppurative myelitis. the most severe neurological lesions were found in the midbrain at the rostral coliculi with moderate to severe multifocal vasculitis and gliosis. as this was the first known occurrence of cerebral disease in sheep in australia caused by n. caninum, we surveyed sera from five sheep prop ...201020189309
age and nutrition influence the concentrations of three branched chain fatty acids in sheep fat from australian abattoirs.the characteristic mutton odour, associated with the cooked meat of older sheep, can be problematic for some consumers who find the odour disagreeable. branch chain fatty acids (bcfas) are considered to be the main determinants of mutton odour. in this study, the aim was to identify the factors influencing the bcfa content of animals at abattoirs in australia. samples of subcutaneous fat from over the chump (gluteus medius) were collected from 533 sheep carcasses at abattoirs in new south wales, ...201020696535
arrangement of trichokeratin intermediate filaments and matrix in the cortex of merino wool.tomograms of transverse sections of merino wool fibers obtained from fleeces differing in fiber curvature were reconstructed from image series collected using a 300kv transmission electron microscope. trichokeratin intermediate filaments (ifs) from the ortho-, para- and mesocortices were modeled from the tomograms. ifs were predominantly arranged in left-handed concentric helices with the relative angle of ifs increasing progressively from the center to the periphery of orthocortex macrofibrils. ...201120732426
association of microsatellite polymorphisms with immune responses to a killed mycobacterium avium subsp. paratuberculosis vaccine in merino sheep.to study the association of polymorphisms at five microsatellite loci with immune responses to a killed mycobacterium avium subsp. paratuberculosis (map) vaccine.201020927174
minimising the development of anthelmintic resistance, and optimising the use of the novel anthelmintic monepantel, for the sustainable control of nematode parasites in australian sheep grazing systems.to compare the risk of different treatment scenarios on selecting for anthelmintic resistance on australian sheep farms.201121495986
no loss of production due to larval challenge in sheep given continuous anthelmintic treatment via a controlled release capsule.this study aimed to quantify production loss due to larval challenge in sheep administered a controlled release albendazole capsule (crc) and thus determine the suitability of crc treated sheep as a proxy for worm-free sheep in grazing experiments. the experiment used an incomplete 2+ù3 latin square design with 81 merino wethers. sheep were either infected (inf) with mixed oral infection of albendazole-susceptible haemonchus contortus, trichostrongylus colubriformis, and teladorsagia circumcinct ...201121824729
disease control during the colonial period in australia.the first permanent european settlers of australia arrived in 1788 to establish a penal colony at sydney, new south wales (nsw). as the colony grew and wool production increased, more free settlers and emancipists developed farming in inland australia. during the 1840s veterinarians commenced arriving in small numbers but they were not closely associated with the development and execution of disease control programs, which was left to lay inspectors of stock. the arrival of william tyson kendall ...201121696369
Agricultural health and safety performance in Australia.This study aimed to determine the proportion of Australian farming enterprises with systems and processes that meet current regulatory and industry standards for health and safety. Data from 683 farming enterprises were drawn from a nationally stratified random sample representing seven commodity sectors: beef cattle, cotton, dairy, horticulture, grain growing, sheep, and sugar cane. Results indicated low levels of implementation for farm health and safety plans as well as induction for new work ...201121958403
25 years of natural product r&d with new south wales agriculture.following recent nsw government restructuring, the department of agriculture now exists in a composite form along with forestry, fisheries and minerals in the new nsw department of primary industries. this paper outlines some of the highlights of secondary metabolite r&d accomplished in the 25 years since the essential oil research unit was transferred from the museum of applied arts & sciences, sydney to nsw agriculture's wollongbar agricultural institute on the nsw north coast. the essential o ...200518007515
a salmonella typhimurium 197 outbreak linked to the consumption of lambs' liver in sydney, nsw.we identified an increase in the number of cases of salmonella typhimurium phage type 197 in new south wales in february 2005. cases were predominantly of lebanese descent. to identify risk factors for illness, we conducted an unmatched case-control study including 12 cases and 21 controls. eight of 12 cases (67%) and no controls reported eating lambs' liver (or incalculable, p<0.05), and seven of nine cases (78%) and one of 21 controls (5%) reported eating fresh fish (or 70.0, p<0.05). among pa ...200817565766
estimating the incidence of fly myiases in australian sheep flocks: development of a weather-driven regression model.the blowfly, lucilia cuprina wiedemann (diptera: calliphoridae), is the primary myiasis (strike) fly of sheep in australia. most strike occurs in the anal-perineum area (crutch), but strike to the neck, shoulders, back and withers (body) is also important. regression analysis was used to determine the extent to which the weekly incidence of flystrike can be explained by variations in fly abundance and/or recent changes in weather, pasture conditions or flock management. strike and flock manageme ...200717550435
the impact of malnutrition and other causes of losses of adult sheep in 12 flocks during drought.to establish the range and cost of losses in merino flocks in southern new south wales during drought conditions by determining the cause of death, morbidity or wasting in adult sheep.200616879129
losses of adult sheep due to ovine johne's disease in 12 infected flocks over a 3-year period.to measure the biological and financial impact of ovine johne's disease (ojd) mortalities on 12 infected flocks within the endemic area of southern new south wales over a 3-year period.200616879127
bioassay-derived androgenic and estrogenic activity in municipal sewage in australia and new zealand.raw sewage and sewage at various stages of treatment were sampled from 15 municipal sewage treatment plants in south queensland (australia) and canterbury (new zealand). estrogenic and androgenic activities were determined with sheep estrogen receptor and rainbow trout androgen receptor binding assays, respectively. selected estrogenic chemicals were also analyzed by gas chromatography-mass spectrometry. the raw sewage influents contained significant levels of both estrogenic (<4-185 ng/l estrad ...200616169080
anthelmintic resistance in sheep worms in new south wales, australia. 200211858150
waavp/pfizer award for excellence in veterinary parasitology research. my involvement in, and some thoughts for livestock parasitological research in australia.being presented with the waavp pfizer award for excellence in parasitological research is the pinnacle of my career. in accepting i acknowledge the support that i have received from workmates, colleagues, friends and family over the years that i have been involved in this field of endeavour. parasitic disease is the most significant threat to the australian sheep industry. a lack of understanding of drug action, the absence of epidemiologically-based treatment programs and incorrect or excessive ...200010681027
combining data from morphological traits and genetic markers to determine transmission cycles in the tape worm, echinococcus granulosus.species of echinococcus (cestoda: taeniidae) require 2 mammalian hosts to complete their life-cycle; a carnivorous definitive host, and a herbivorous or omnivorous intermediate host. for most species of echinococcus, the definitive host range is restricted to 1 or a few species, but the intermediate host range is very broad. programmes to control hydatid disease attempt to break the life-cycle of the parasite and their effectiveness is therefore enhanced by an understanding of local patterns of ...19989778641
scrapie-free merino and poll dorset sheep from australia and new zealand have normal frequencies of scrapie-susceptible prp genotypes.as natural scrapie occurs only in sheep of specific prp genotypes, one proposed aetiology was that scrapie is simply a genetic disease. however, cheviot and suffolk sheep of scrapie-susceptible genotypes are found in australia and new zealand, both generally accepted to be scrapie-free countries. a study of more common australia and new zealand sheep breeds (merinos and poll dorsets) was carried out in order to obtain more generally applicable estimates of australia and new zealand sheep prp gen ...19989714260
the characteristics and causes of sheep losses in the victorian mallee.the extent and causes of sheep losses in the semi-arid mallee region of north-western victoria were assessed by interviewing the owners of 79 randomly selected farms running 241 flocks in 1987/88 and 245 flocks in 1988/89. mean annual losses were higher in ram flocks (21%) than in ewe flocks (7%), in flocks of non-merino sheep (rams 24%, ewes 11%, weaners 5%) than in merino (rams 11%, ewes 6%, wethers 4%, weaners 4%) and in ewe flocks 3 or more years old (10%) than in young ewe flocks (3.5%). in ...19958585847
prevalence of virulent footrot in sheep flocks in southern new south wales. 19947848187
application of elisa to the serological diagnosis of virulent ovine footrot.the sensitivity and specificity of an elisa that detects antibody in the serum of sheep against dichelobacter nodosus was investigated. the sensitivity of the assay was determined in two trials in which sheep free of virulent footrot were exposed to a virulent strain of d. nodosus. in the first trial up to 96.6% of sheep that developed severe foot lesions were seropositive 2 weeks later. the proportion of seropositive sheep depended on the interval between exposure to d. nodosus and collection o ...19947801518
akabane disease in sheep.perinatal lamb mortality, associated with malformations of the cns due to akabane viral infection, occurred in 4 of 9 flocks of ewes lambing on 3 farms between 26 may and 14 november, 1976. cases were restricted to ewes conceiving prior to the second week of march and lambing between 26 may and 19 july. as judged by seroconversion in sentinel flocks on 2 of the farms, field infection with akabane virus occurred mainly between mid-february and mid-april. malformations of the cns occurred in 42.5% ...19883135792
biological control of nematode parasites in sheep.in a world in which sheep producers are facing increasing problems due to the rapid spread of anthelmintic resistance, the battle against gastrointestinal parasitic nematodes is a difficult one. one of the potential new tools for integrated control strategies is biological control by means of the nematode-destroying microfungus duddingtonia flagrans. this fungus forms sticky traps that catch developing larval stages of parasitic nematodes in the fecal environment. when resting spores (chlamydosp ...200616582084
molecular epidemiology of mycobacterium avium subsp. paratuberculosis: is900 restriction fragment length polymorphism and is1311 polymorphism analyses of isolates from animals and a human in australia.the distribution and prevalence of strains of mycobacterium avium subsp. paratuberculosis were determined among sheep, cattle, and other species with johne's disease in australia. a total of 328 isolates were evaluated from numerous farms in new south wales, victoria, tasmania, and south australia, australia. restriction fragment length polymorphism (rflp) analysis of genomic dna using bsteii and an is900 probe and is1311 polymorphism analysis using pcr and restriction endonuclease analysis (pcr ...200010970365
morphological characterization of adult echinococcus granulosus as a means of determining transmission patterns.host induced changes in morphological characters of the rostellar hooks of echinococcus granulosus were used to determine the origin of infection in definitive hosts in rural areas of southeastern australia where wild and domestic cycles of transmission may interact. the morphological characters studied vary depending on the species of intermediate host (macropod marsupials, sheep) in which protoscoleces develop, and these characters are retained in adult worms. it was therefore possible to dete ...19938437058
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