avian botulism during late autumn and early spring in saskatchewan.two outbreaks of botulism in central saskatchewan in which mortality of waterfowl continued into late autumn and then recurred in the same marshes the following spring are described. small numbers of birds were involved in each instance. dabbling ducks (predominantly mallards, anas platyrhynchos and pintails, anas acuta) and american coots, fulica americana were affected most commonly in autumn, whereas only diving ducks (predominantly lesser scaup, aythya affinis) were found to be involved in s ...19836887447
blood values of the canvasback duck by age, sex and season.blood samples were obtained from canvasback ducklings from manitoba and saskatchewan and from immature and adult canvasbacks on the mississippi river near lacrosse, wisconsin and the chesapeake bay. these samples were used to determine baseline data on red cell counts, hematocrit, total protein, glucose, cholesterol, hemaglobin and distribution of plasma proteins. calculations were also made to determine mean corpuscular volume, mean corpuscular hemoglobin and mean corpuscular hemoglobin concent ...197616498873
Selenium accumulation and reproduction in birds breeding downstream of a uranium mill in northern Saskatchewan, Canada.Selenium (Se) concentrations in aquatic invertebrates and bird eggs collected along the treated effluent receiving environment of the Key Lake uranium mill in northern Saskatchewan were significantly greater than from nearby reference areas, and in some cases (e.g., eggs of common loons-Gavia immer) were higher than commonly used thresholds for adverse reproductive effects in birds (i.e., 5 µg/g dry weight in diet; 12-15 µg/g dry weight in eggs). Mean Se concentrations in tree swallow (Tachycine ...201121927945
avian influenza: the canadian experience.reports of sporadic avian influenza outbreaks involving domestic poultry date back to the 1960s. with the exception of a/turkey/ontario/7732/1966 (h5n9), which was isolated from a turkey breeding establishment, all viruses characterised prior to 2004 fit the criteria of low pathogenic avian influenza (lpai). only in retrospect was a/turkey/ontario/7732/1966 shown to meet the criteria of a highly pathogenic avian influenza (hpai). in 2004, canada reported its first case of hpai to the world organ ...200919618638
first canadian outbreak of west nile virus disease in farmed domestic ducks in saskatchewan. 200718189050
vitamin a status of wild mallards (anas platyrhynchos) wintering in saskatchewan.vitamin a status of wild male mallards (anas platyrhynchos) overwintering in saskatchewan, canada was determined. vitamin a levels < 0.2 micrograms hepatic retinyl palmitate/g liver, occurred in 6% and 25% of male mallards sampled in 1991 to 1992 and 1992 to 1993, respectively. there was no temporal trend in vitamin a levels over either winter. squamous metaplastic lesions, commonly associated with vitamin a deficiency in domestic animals, were not observed in any bird; hence, they were not a go ...19958592347
observations on waterfowl carcasses during a botulism epizootic.several features related to waterfowl carcasses were studied at eyebrow lake, saskatchewan, canada, during a botulism epizootic in the summer of 1989. dummy carcasses, constructed by stretching duck skins over wooden forms, were used to assess the reaction of waterbirds to carcasses. there was no significant difference in the number of american coots, ducks, grebes, or total birds present when dummy carcasses were or were not present. only one of 42 freshly-dead bird carcasses marked and observe ...19938445793
starvation, staphylococcosis, and vitamin a deficiency among mallards overwintering in saskatchewan.during january to march 1991, 38 mallards (anas platyrhynchos) found dead from a group of approximately 600 overwintering on the south saskatchewan river were examined. thirty birds died from starvation, four had disseminated staphylococcus aureus infection, and the cause of death of four birds was not determined. all six birds from which the esophagus was examined microscopically, including the four birds with staphylococcosis, had squamous metaplasia of the submucosal glands, a lesion pathogno ...19921602572
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