| haemophilus somnus infections i. a ten year (1969-1978) retrospective study of losses in cattle herds in western canada. | a total of 838 outbreaks of fatal haemophilus somnus infections in herds of cattle were diagnosed at provincial veterinary laboratories in manitoba, saskatchewan, alberta and british columbia during the period 1969-1978. the index cases from these outbreaks included 759 cases of thromboembolic meningoencephalitis, 78 cases of fibrinous pneumonia with pleuritis and one case of h. somnus abortion. the epizootics were subdivided on the basis of province, class and age of cattle and seasonal occurre ... | 1980 | 7397616 |
| haemophilus somnus infections. ii. a canadian field trial of a commercial bacterin: clinical and serological results. | 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 wher ... | 1980 | 7427852 |
| the occurrence of haemophilus somnus in feedlot calves and its control by postarrival prophylactic mass medication. | three field trials were conducted in a large commercial feedlot in saskatchewan to determine the prevalence of haemophilus somnus in calves and to evaluate the efficacy of prophylactic mass medication with long-acting oxytetracycline on day 17 (1990, n = 1336), day 11 (1991, n = 4372), or day 8 (1992, n = 5632) postarrival. hemophilosis accounted for > 40% of the mortality in feedlot calves each year. haemophilus somnus was cultured from the blood of one febrile calf on day 1 (0.1%, n = 895), bu ... | 1994 | 7994720 |
| epidemiological study of enzootic pneumonia in dairy calves in saskatchewan. | a field study involving 325 calves from 17 dairy herds in saskatchewan was conducted to determine the risk of enzootic pneumonia and to assess its association with a number of factors. two different case definitions of pneumonia were used in the analyses: the first was based on producers' treatment risk (case1) and the second was based on semimonthly clinical examinations of calves by the research veterinarian (case2). the risk of pneumonia based on case1 was 39% and on case2 was 29%. the measur ... | 1993 | 8269363 |