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The first objective of this study was to document the design of subsurface longlines used for the farming of blue mussels (Mytilus edulis) in Prince Edward Island (PEI), Canada; the second objective was to identify possible associations between longline design and mussel growth. In 2003, SCUBA diver...
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Surveys of the weed flora in Danish arable fields were conducted during 1967-70 and 1987-89. Frequencies of 67 common weed species in spring barley, spring rape, winter rye, winter wheat and grass ley were compared. The comparison showed that the occurrence of common weed species has generally decre...
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We evaluated the performance of two enzyme-immunoassays (EIA) for the detection of naturally occurring, thermophilic Campylobacter spp. found in faecal samples from cattle (n = 21 and n = 26) and swine (n = 43) relative to the standard culture method, and also assuming that none of the tests was the...
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The objectives of the study were to determine 1) how sampling time between milkings affects the sensitivity and specificity of somatic cell count (SCC) as an indicator for intramammary infection (IMI) status, and 2) which cells are responsible for the diurnal variation in SCC. Six Prince Edward Isla...
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Bulk milk somatic cell count (BMSCC), individual cow somatic cell count (ICSCC), and incidence rate of clinical mastitis (IRCM) are all udder health parameters. So far, no studies have been reported on the effect of season on BMSCC, IRCM, and ICSCC in the same herds and period over multiple years. T...
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The results are analysed of a study of nitrate concentrations in ground water in forests in different areas of Denmark in 1986-93. Consideration is given to the forest size, forest types, tree composition, soil types, and to the month and year of sampling. The results of some other studies (publishe...
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A flow cytometric method has been developed for rapid determination of sperm concentration in semen from various mammalian species.* All cells containing DNA are stained with SYBR-14 or propidium iodide (PI) and sperm concentration is determined in relation to an internal standard of fluorescent mic...
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The argmax distribution in Bhattacharya and Brockwell (1976) is extended to branches with unequal scalings as well as drifts. Examples show how this distribution class in change point problems with unequal variability may provide better approximations for the MLE than the symmetrical limit in Yao (1...
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Binary repeated measures data are commonly encountered in both experimental and observational veterinary studies. Among the wide range of statistical methods and software applicable to such data one major distinction is between marginal and random effects procedures. The objective of the study was t...
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Cattle herds (N=26,639) were classified as having persistently infected (PI) animals (PI-herds) or not (non-PI-herds) with 4,519 PI-herds (17.0%). Regional differences in occurrence of BVDV infections were identified. The K-function indicated clustering at 250 m and 1 km. The semivariogram indicated...
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A study was conducted in 1994-96 with the aim of assessing the serological prevalence of Border Disease (BD) among sheep and goats in Denmark and to investigate possible relations to herd factors. From each of 1000 herds, 2 blood samples were obtained from animals older than 1 year. The examination ...
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Nitrate in the soil water below the root zone is a pre-condition for nitrate leaching, and it indicates loss of nutrients from the forest ecosystem. Nitrate leaching may potentially cause eutrophication of surface water and contamination of groundwater. In order to evaluate the extent of nitrate lea...
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In 2008, Canada designed and implemented the Canadian Notifiable Avian Influenza Surveillance System (CanNAISS) with six surveillance activities in a phased-in approach. CanNAISS was a surveillance system because it had more than one surveillance activity or component in 2008: passive surveillance; ...
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"This book started life as a veterinary text: Veterinary Epidemiologic Research. ... Methods in Epidemiologic Research is based heavily on the material covered in Veterinary Epidemiologic Research, with 2 major changes. Firstly, all of the veterinary examples have been replaced with human medic...
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During the course of a multi-site clinical field trial comparing the field effectiveness of Atlantic salmon (Salmo salar L.) vaccines, an opportunity arose to examine the potential effects of repeated fish handling on the controlled trial outcome. Fish-level data obtained by seining, dip-netting and...
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Changes in nitrate concentration in groundwater from wells in Prince Edward Island, Canada were investigated over time using two datasets. Temporal trends in groundwater nitrate concentrations were assessed annually during 1981–1996 (1,299 observations), and both seasonally and monthly during 1988...
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It is well documented that nursing is concerned about the social support needs of older adults and the effects of those needs on health and well-being. Using survey data from the Atlantic Seniors Housing Research Alliance, the authors explore the emotional and informational social support needs of c...
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Freedom from infection modeling, using scenario trees, has become an established methodology and is well described in the literature. However, standards for organizing and reporting the surveillance information incorporated into such models are less developed. Canada has been routinely testing for T...
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A cross-classified and multiple membership Cox model was applied to calf mortality data from Western Canada, where 23,409 calves from 174 herds were followed for up to 180 days after calving. The herds were cross-classified by 49 veterinary clinics and 9 ecological regions and in a multiple membersh...
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