Microfilaraemia in Australian native birds     

GP REPPAS  WJ HARTLEY  PA GILL 《Australian veterinary journal》1995,72(9):356-357

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Akabane disease in sheep   总被引：1，自引：0，他引：1  

KG HAUGHEY  WJ HARTLEY†  AJ DELLA-PORTA‡  MD MURRAY§ 《Australian veterinary journal》1988,65(5):136-140

Perinatal lamb mortality, associated with malformations of the CNS due to Akabane viral infection, occurred in 4 of 9 flocks of ewes lambing on 3 farms between 26 May and 14 November, 1976. Cases were restricted to ewes conceiving prior to the second week of March and lambing between 26 May and 19 July. As judged by seroconversion in sentinel flocks on 2 of the farms, field infection with Akabane virus occurred mainly between mid-February and mid-April. Malformations of the CNS occurred in 42.5%, 51.2%, 100% and 31.0% of the dead lambs examined in the affected flocks respectively. Prevalence in the 4 affected flocks, expressed as the proportion of ewes lambing which delivered at least one malformed foetus, was 6.1%, 8.4%, 88.9% and 5.7% respectively. Lamb mortality due to malformations of the CNS was 7.1%, 5.5%, 92.3% and 5.7% of lambs born. Age-specific prevalence was calculated for 3 of the 4 flocks and 2-year-old ewes accounted for 71.4% and 76.9% of total cases respectively in 2 flocks, whereas in one flock malformations occurred at equivalent frequencies throughout several older age groups. Birthweights of affected lambs were usually significantly lighter than those of unaffected lambs of similar sex and birth-type, and their mean duration of gestation was slightly, and significantly, prolonged. Micrencephaly (88.1% of cases) and hydrocephalus (68.7% of cases) were the outstanding pathological features of the malformations with hydranencephaly, microgyria, porencephaly and attenuation of the spinal cord occurring at much lower frequencies.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   

Factors associated with average daily gain, fever and lameness in beef bulls at the Saskatchewan Central Feed Test Station.          下载免费PDF全文

H G Townsend  A H Meek  T G Lesnick    E D Janzen 《Canadian journal of veterinary research》1989,53(3):349-354

Data obtained from the Saskatchewan Central Feed Test Station in Saskatoon, Saskatchewan, Canada were examined for evidence of factors related to average daily gain and the diseases occurring in 326 beef bulls during the 1983-84 test. Average daily gain was found to be significantly associated with breed, pen assignment and initial test weight but was not associated with disease or age upon arrival at the test station. Lameness was associated with breed and initial weight, while fever (suspected respiratory disease) was associated with age. The predicted odds of lameness was approximately seven times greater in the animal with the heaviest as compared to the lightest initial test weight and the predicted odds of fever was approximately five times greater in the youngest as compared to the oldest animal.  相似文献   

Possible Monensin Poisoning in a Group of Bulls   总被引：3，自引：1，他引：2       下载免费PDF全文

E. D. Janzen  O. M. Radostits    J. P. Orr 《The Canadian veterinary journal. La revue veterinaire canadienne》1981,22(4):92-94

Apparent monensin toxicity was diagnosed in a group of Maine Anjou bulls placed on a performance test in a commercial feedyard in east central Saskatchewan. The clinical, hematological and pathological findings were consistent with a diagnosis of congestive heart failure. The suspected dose ingested by the bulls was based on a mixing error evident from the feedlot's daily feed journal. When deaths in the group of bulls began to occur, the intoxicating feedstuff was no longer available for confirmation of the diagnosis.  相似文献   

Visceral leishmaniasis in a dog: clinical, hematological and pathological observations.   总被引：1，自引：0，他引：1       下载免费PDF全文

L Tryphonas  Z Zawidzka  M A Bernard    E A Janzen 《Canadian journal of veterinary research》1977,41(1):1-12

Visceral leishmaniasis was diagnosed in a dog that had been living with his owners in Spain for two years. Clinical diagnosis was somewhat delayed as the disease is largely unknown to Canada and was manifested by a nonresponsive anemia which was not easily explained on peripheral blood evaluation alone, and concomitant interstitial nephritis. On post mortem examination splenomegaly was the main gross pathological finding. Light microscopic examination of bone marrow aspirates and subsequent electron microscopic examination of splenic and hepatic tissues revealed numerous Leishman-Donovan bodies in cells of the reticuloendothelial system. Parasitized reticuloendothelial cells were seen singly or forming granulomata. These latter did not contain giant cells and were confined mainly to the liver and spleen, being sparse and single in the first but extremely numerous and coalescing in the latter. Accumulation of intrafollicular hyaline material was seen in a small number of splenic follicles. Leishman-Donovan bodies on electron microscopic examination had a trilaminar periplast, a large round nucleus with heavy blocks of marginated chromatin and two nucleoli, a short flagellum and a kinetoplast. Lymph nodes and bone marrow had numerous parasitized macrophages but no granulomata. Leishman-Donovan bodies were not detected in the lungs and kidneys both of which exhibited a chronic intersitital reaction. The comparative hematological profile as well as the importance of bone marrow and electron microscopic examinations of the spleen and liver in diagnosis are discussed. The potential public health hazard of leishmaniasis to North America and particularly to Canada is considered.  相似文献   

Hypocalcemic paresis in beef cows in Northeastern Alberta.   总被引：1，自引：1，他引：0       下载免费PDF全文

E Janzen 《The Canadian veterinary journal. La revue veterinaire canadienne》1976,17(11):298-300

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Use of goose red blood cells for detection of infection with psittacine beak and feather disease virus by haemagglutination and haemagglutination inhibition     

N SEXTON  WJ PENHALE  SL PLANT  DA PASS 《Australian veterinary journal》1994,71(10):345-347

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Haemophilus somnus Infections II. A Canadian Field Trial of a Commercial Bacterin: Clinical and Serological Results   总被引：11，自引：2，他引：9       下载免费PDF全文

J. R. Saunders  E. D. Janzen 《The Canadian veterinary journal. La revue veterinaire canadienne》1980,21(8):219-224

To evaluate the efficacy of a Haemophilus somnus bacterin a total of 1114 beef calves or yearling bulls were used in the province of Saskatchewan. The six herds were included in a vaccination trial in which the vaccine was administered subcutaneously in one or two doses. The prevalence of H. somnus in nasal swabs of these animals at the time of the initial vaccination was 0.35% Postvaccination information on morbidity and mortality for a four month period was requested from the five ranches where there were nonvaccinated control calves. Postvaccination outbreaks of infectious thromboembolic meningoencephalitis occurred in two of these herds and, although the numbers were limited, there was a trend to reduced morbidity and mortality in the vaccinated animals compared to controls. Seroconversion rates, as determined by the complement fixation test, in the six herds were 28.3% for control calves, 57% for animals vaccinated once and 80.3% for animals vaccinated twice. On the basis of these results the bacterin was considered to be sufficiently efficacious to warrant its further evaluation under field conditions.  相似文献   

Routine castration in 568 draught colts: incidence of evisceration and omental herniation     

Shoemaker R  Bailey J  Janzen E  Wilson DG 《Equine veterinary journal》2004,36(4):336-340

REASONS FOR PERFORMING STUDY: Castration is one of the most common routine surgical procedures performed in the horse, from which a number of potential complications can arise. We undertook a prospective evaluation of short-term complications associated with castration of draught colts over a 3-year period (1998-2000). OBJECTIVES: To compare castration complications in a large number of draught foals with previously published literature. METHODS: Five hundred and sixty-eight draught colts, age 4 or 5 months, were castrated in field conditions. Foals were observed for complications for 24 h post operatively. RESULTS: There was no significant difference in complication rates between open and closed surgical techniques. Inguinal/scrotal hernia rate was 4.6% (26/568) prior to surgery, and evisceration of the small intestine occurred in 4.8% (27/568). Foals observed to eviscerate underwent immediate surgical correction with an overall survival rate of 72.2% (13/18). Omental herniation was seen in 2.8% (16/568) of colts. CONCLUSIONS: This study showed no difference between the closed and open techniques of castration and the rate of omental herniation or evisceration. The evisceration rate in combination with the omental and presurgical herniation rates approached 12.2%, which is high enough to warrant further examination. POTENTIAL RELEVANCE: Future investigation should help to assess predisposing factors for evisceration. Regardless of the technique employed, herniation appears to pose a significant risk to draught foals undergoing castration.  相似文献   

A retrospective study of non-suppurative encephalitis in beef cattle from western Canada     

Sergio Sánchez  Edward G. Clark  Gary A. Wobeser  Eugene D. Janzen  Hélène Philibert 《The Canadian veterinary journal. La revue veterinaire canadienne》2013,54(12):1127-1132

Non-suppurative encephalitis occurs sporadically in beef cattle in western Canada, leading to loss of animals. This retrospective study investigated the presence of viral, bacterial, and protozoal antigens or DNA in 37 western Canadian feedlot cattle with non-suppurative encephalitis for which a cause had not been identified. Cases were selected based on the age of the animal (> 7 months), and clinical history of recumbency and depression. The identification of rabies in 1 case stresses the importance of including this viral disease in the list of differential diagnoses. Because there was variation in the severity, distribution, and type of lesions, it is possible that there may be more than 1 cause, but failure to identify an infectious agent might also suggest that non-infectious agents could play a role.  相似文献