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Five serological assays: the buffered plate antigen test, the standard tube agglutination test, the complement fixation test, the hemolysis-in-gel test and the indirect enzyme immunoassay were diagnostically evaluated. Test data consisted of results from 1208 cattle in brucellosis-free herds, 1578 c...
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Factors which influence somatic cell counts in bovine milk are reviewed and guidelines for their interpretation are presented. It is suggested that the thresholds of 300 000 and 250 000 cells/ml be used to identify infected quarters and cows respectively. However, it is stressed that somatic cell co...
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OBJECTIVE: To determine anatomic patterns and clinical importance of increased radiopharmaceutical uptake in bones of horses used for show jumping, hunting, and eventing. DESIGN: Retrospective study. ANIMALS: 141 horses evaluated because of lameness. PROCEDURE: Medical records were reviewed, and inf...
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A mail survey of Canadian sheep flocks registered on the Record of Performance program was conducted, and the association of management practices and diseases with productivity was studied using multiple regression techniques. The relationships between management practices and diseases of lambs whic...
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Regression analysis was used to determine the ability of a number of biological parameters to predict economic efficiency. Detailed feed, financial, and production records were maintained by a random sample of eighteen Prince Edward Island (PEI) swine producers (each producing over 1000 market hogs ...
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The pharmacokinetic parameters of erythromycin in foals were determined following intravenous administration of 5.0 mg/kg to animals aged 1, 3, 5 and 7 weeks. The distribution of the drug was described by a two-compartment open model, and no significant differences were observed between coefficients...
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Data from 1565 milk samples collected weekly from the University of Guelph mastitis research herd were used to evaluate somatic cell counts (SCC) as a screening test for prevalent intramammary infections. Changes in SCC were evaluated as a screening test for incident infections. The sensitivity and ...
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Path analysis was used to determine the interrelationships between postpartum administration of gonadotrophin releasing hormone and cloprostenol and the occurrence of reproductive disease and reproductive performance in dairy cows. The data analysed were those collected on 226 Holstein-Friesian cows...
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Criteria for diagnosing intramammary infections (IMI) have been debated for many years. Factors that may be considered in making a diagnosis include the organism of interest being found on culture, the number of colonies isolated, whether or not the organism was recovered in pure or mixed culture, a...
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A case-control study was conducted to compare the physical hoof properties of digits responsible for clinical lameness with those of other digits on the same cows and with those of equivalent digits on non-lame control cows. The control cows were herd-mates matched by age, breed and stage of lactati...
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This manuscript is derived from a presentation at the 2006 AVEPM - Schwabe Symposium which honoured the 2006 recipient of the Calvin Schwabe Award - Dr. S. Wayne Martin. Throughout his career, Dr. Martin was instrumental in furthering the development of quantitative epidemiology. This manuscript hig...
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Herd level measures of health and productivity in Prince Edward Island dairy herds, computed monthly over a 4 year period, were evaluated. Descriptive statistics for 11 key measures of health and productivity were computed. The parameters cover the areas of milk production, reproductive performance,...
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A computerized health and production information network (APHIN: Animal Productivity and Health Information Network) was developed in Prince Edward Island (P.E.I.) to serve the livestock industries. The dairy portion of the network is designed primarily to aid in the reduction of the unit cost of pr...
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The objective was to identify postpartum risk factors between nutritional imbalance and health disorders affecting first-service conception risk (FSCR) in 21 commercial Holstein herds in Reunion Island. Multivariate logistic-regression models including herd as a random effect were used to analyze th...
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A previously reported increase in Nocardia mastitis in Canada was associated with the use of neomycin-based dry cow mastitis preparations; their production and distribution ceased in 1989. Since then the frequency of Nocardia isolations has declined in most provinces, particularly in British Columbi...
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The objectives of this paper are to provide an introduction to meta-analysis and systematic review and to discuss the rationale for this type of research and other general considerations. We highlight methods used to produce a rigorous meta-analysis and discuss some aspects of interpretation of meta...