Results

1551 - 1575 of 1922
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The performance of flow cytometry (FC) was compared with immunofluorescence microscopy (IM) for detection of Giardia duodenalis in bovine feces. Samples from 36 adult dairy cows and 208 dairy calves were collected. Flow cytometry test characteristics were calculated using continuous, ordinal, and di...
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The prevalence of Kudoa thyrsites was determined for 17 harvests of Atlantic salmon (Salmo salar) from 7 fish farms in British Columbia, Canada. Fish were divided into 2 categories, sexually immature and sexually mature (grilse), using criteria typically employed at processing plants (external morph...
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Atlantic salmon S. salar naturally and experimentally exposed to infectious hematopoietic necrosis virus (IHNV) in British Columbia, Canada, developed antibodies against the virus. More than 50% of the fish exposed to IHNV remained seropositive for several months after the IHN epizootic had subsided...
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Batrachochytrium dendrobatidis (Bd) is a chytrid fungus, which has been associated with numerous amphibian mortality events around the world. It is hypothesized that Bd was inadvertently spread through human activities. We have developed a basic risk assessment tool to better understand the potentia...
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The expansion of aquaculture and the demand for ornamental fishes have resulted in the large-scale movements of aquatic animals and their pathogens. Here, we review the most important non-native fish and shellfish pathogens in European waters and their global impacts on wild fish host populations. T...
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A study was conducted to evaluate how the invasive Asian cyprinid Pseudorasbora parva, a recently introduced fish, caused increased mortality and totally inhibited spawning in an endangered native fish, the European cyprinid Leucaspius delineatus. Laboratory experiments showed that the holding water...
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Prevalence of the pathogen Batrachochytrium dendrobatidis (Bd), implicated in amphibian population declines worldwide, is associated with habitat moisture and temperature, but few studies have varied these factors and measured the response to infection in amphibian hosts. We evaluated how varying hu...
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Waterborne outbreaks caused by Cryptosporidium and Giardia are well documented, while the public health implications for foodborne illness from these parasites have not been adequately considered. Cryptosporidium and Giardia are common in domestic livestock, where young animals can have a high preva...
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The Kitasoo/Xai'xais First Nation established a program to monitor sea lice levels on seaward migrating wild juvenile salmon in their traditional territory which contains the most northerly salmon farming region of British Columbia. A total of 12 locations were routinely sampled during the period be...
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Infestation patterns of the sea louse Lepeophtheirus salmonis from 44 salmon farms in the Hardangerfjord on the south-west coast of Norway over the period 2004 to 2007 were assimilated to create 20-month production cycle profiles for spring and autumn stocked generations. The timing and frequency of...
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This communication briefly reviews some of the factors which have shaped the current protocols for lice counting on salmon farms and points out that the motivation for counting is not always the same. It is also apparent that a number of widely accepted assumptions, such as those relating to presume...
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An observational study was conducted in 63 Canadian dairy farms to evaluate the association of bulk tank milk selenium (Se) concentration (BTSe) with average daily milk yield, milk fat and milk protein, bulk tank somatic cell count (BTSCC), and the probability of being a Staphylococcus aureus-positi...
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In a cross-sectional study of 633 pigs from 21 herds on Prince Edward Island, Canada (PEI), the prevalence of infection with Cryptosporidium and Giardia, and the genotypes and species of isolates were determined in order to establish the zoonotic potential of pigs in this region. As determined by di...
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The objectives of this study were to determine the prevalence and assemblages of Giardia and species of Cryptosporidium on beef farms in Prince Edward Island (PEI), Canada, including the water sources associated with the farms, and to determine risk factors for infection of cattle with these parasit...
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The effect of repeated lamb removal on the blood leukocyte population of ewes was examined and the behavioural and endocrine responses to the stressor quantified. 12 ewes which had given birth to twins, were placed in separate pens with their lambs. After 13 days, the lambs (14-19 days old) from one...
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Suffolk × Greyface lambs, 16 weeks of age, weighing 30-40 kg, were transported by road, confined on a stationary vehicle or received no treatment (controls). The effects of 24 h continuous transport or confinement were compared with those of 12 h treatment followed by 12 h lairage, 3 h lairage or 3...
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In a 2×2 factorial design, 6 sheep were either transported by road for 15 h or kept in their home pens, and then either starved for 12 h with access to water or offered hay ad libitum with access to water. All groups were offered hay and water 12 h after transport. Behavioural observations and meas...
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The aim of this project was to examine the relationships between driver behaviour and driving events during a journey and the behavioural responses of sheep to these events. Driving style can have a major influence on the welfare of the animals by affecting the risk of injury and by disturbing the a...
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The preslaughter handling and behaviour, and subsequent bruising was observed in 40 groups of sheep in a commercial slaughterhouse. A greater percentage of bruised carcasses was found in lambs (71%) than in ewes (49%). A greater percentage of severely bruised carcasses was found in lambs from market...
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Two groups of 5 sheep (7 months of age) were moved and isolated in pens which did not allow visual and tactile contact with other sheep for 24 h. They were then moved back to their original pens where visual and tactile contact was possible. After 24 h the procedure was repeated 7 times for one grou...
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The pre-slaughter handling, behaviour and blood composition of beef cattle at slaughter was studied in a commercial slaughterhouse. The main problems identified were the routine use of driving instruments and delays caused by stoppages in the slaughter line. The plasma concentration of cortisol at t...