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101 - 125 of 259
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Horses admitted to the UC Davis Veterinary Medical Teaching Hospital between 1 July 1992 and 30 June 1994 were studied to determine associations between horse demographics, horse-management factors, and equine C. pseudotuberculosis infection in California. 134 case horses were evaluated, and 800 con...
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A modified culture method using C18-carboxypropylbetaine (CB-18) and microscopic screening was evaluated for time to and limit of detection of Mycobacterium avium subsp. paratuberculosis (MAP) in raw milk. Bulk-tank milk samples were spiked with six different concentrations (101 to 106 CFU/mL) of MA...
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Real-time quantitative polymerase chain reaction (qPCR) testing for Mycobacterium avium subspecies paratuberculosis (MAP) in fecal samples is a rapid alternative to culture on Herrold egg yolk medium (HEYM), the traditional antemortem reference test for MAP. Although the sensitivity and specificity ...
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Diagnostic test evaluations (DTEs) for chronic infections are challenging because a protracted incubation period has to be considered in the design of the DTE, and the adverse effects of infection may be widespread and progressive over an animal's entire life. Frequently, the specific purpose o...
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Objective - To investigate herd characteristics and management practices associated with a high seroprevalence of Mycobacterium avium subsp. paratuberculosis (MAP) in dairy herds in central California. Sample Population - 60 randomly selected cows from each of 21 dairy herds. Procedures - Sera of se...
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Review of PM records from Thoroughbred racehorses that sustained a fatal, exercise-related injury at a California race track during a 9-month period in 1991 revealed that 79 horses had a fatal musculoskeletal injury (FMI) while racing, with an incidence risk of 1.7/1000 race entrants. While training...
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A prospective cohort study was undertaken in a farrow-to-farrow pig herd to describe patterns of pneumonia, and to identify host risk factors associated with the extent of pneumonic lesions in 2 weight groups of slaughter swine. The risk of coughing and pneumonic lesions increased with increasing ag...
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We developed and validated an enzyme immunoassay for immunoreactive pregnanediol-3-glucuronide (iPdG) in feces to monitor reproductive status in desert and Rocky Mountain bighorn sheep (Ovis canadensis). Fecal iPdG concentrations were strongly correlated (r = 0.71) with serum progesterone concentrat...
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In order to test if disease is present in a large herd, an investigator will often subject only a small sample of animals to a fallible diagnostic test. The herd is declared positive for disease if the number of test-positive animals is greater than or equal to a previously chosen cut-off value. Suc...
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The spreadsheet program based on Quattro-Pro version 2.0 was developed to assist researchers, teachers, and practitioners answer questions related to the development and application of diagnostic tests in epidemiological studies and clinical veterinary medicine. Many results are presented graphicall...
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A longitudinal study was undertaken in a swine herd with a continuous problem of foot abscess in unweaned pigs reared on a woven-wire floor. Of 3322, 4-day-old pigs, 199 (6%) developed abscess lesions involving claws and accessory digits before weaning. Lesions were first detected in 4-day-old pigs;...
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Highly reactive horses may pose risks to humans involved in equestrian activities. Among the factors that may affect horses' reactivity to external stimuli are pesticides used for fly control in equine facilities. The organophosphorus (OP) insecticide tetrachlorvinphos (TCVP) is used as a feed-throu...
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The STARD statement (www.stard-statement.org) emphasizes complete and transparent reporting of key elements of test accuracy studies. Guidelines for authors in many biomedical journals recommend adherence to these standards but explicit recommendations by editors of veterinary journals are limited. ...
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Studies were conducted under experimental and field conditions to determine the effect of infection with M. hyopneumoniae on the immune response in serum as measured by ELISA. Following intratracheal challenge or contact exposure, serologically negative pigs derived from mycoplasma-free piggeries de...
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Rabies has been endemic in Lithuania for centuries. Annual rabies reports and data on cattle numbers were collected, and descriptive epidemiology and time series data analyses were performed to detect seasonal trends. A total of 1475 specimens were submitted for rabies testing. Of these, 1248 (84.6%...
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Objective: Sample Population: Procedures: Results: Conclusions and Clinical Relevance: To compare macrostructural and microstructural features of proximal sesamoid bones (PSBs) from horses with and without PSB midbody fracture to gain insight into the pathogenesis of PSB fracture.PSBs from 16 Thorou...
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Objective - To assess concurrently the effects of moderate ligamentous suspensory apparatus injury (MLSAI), racing-speed exercise, and horseshoe characteristics on risk of catastrophic suspensory apparatus failure (SAF) or metacarpal condylar fracture (CDY) in forelimbs of racehorses. Sample populat...
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A Mycobacterium avium subspecies paratuberculosis (MAP) vaccine that reduced the incidence of clinical disease or reduced fecal shedding of MAP would aid control of Johne's disease (JD). The objective of the present study was to evaluate the efficacy of four MAP vaccine combinations, including cell-...
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Using computerized decision-tree analysis and simulation modelling to evaluate control and eradication strategies for pseudorabies virus (PRV) three alternative actions were considered for a hypothetical 100-sow, farrow-to-finish operation: (1) depopulation-repopulation, (2) test-and-removal of sero...
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Reasons for performing study: West Nile virus (WNV) infection is endemic in southern Africa. With the recent emergence of WNV infection of horses in Europe and the USA the present study was performed to estimate the risk of seroconversion to WNV in a cohort of 488 young Thoroughbred (TB) horses. Obj...
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Objective - To describe forelimb horseshoe characteristics of horses racing on dirt surfaces and determine whether these characteristics vary with region of California, season, horse characteristics, and race-related factors. Animals - 5,730 Thoroughbred racehorses. Procedure - From June 17, 2000, t...