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Data on 2875 lactations from 32 herds were analysed. Diseases of the reproductive tract tended to occur together in the same cow as did diseases of the mammary system. Subclinical diseases (mastitis and ketosis) were found to have a substantial impact on milk production/day of life; several clinical...
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We analysed the individual-animal data from six of the nine outbreaks of tuberculosis in Canadian cattle and cervids from 1985 to 1994. A 'positive/reactor' animal was one which had either a positive culture or a positive or suspicious reaction on a mid-cervical, comparative cervical, or gross or hi...
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Fourteen isolates of Campylobacter jejuni of different serotypes and one Campylobacter coli isolate, from various human and animal sources, were tested for potential pathogenic mechanisms. Enterotoxin production was not detected in the infant mouse test or by calf and piglet ligated intestinal loop ...
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The relationships between the calving to first service interval and several measures of reproductive performance were examined in 1738 lactation records from cows in 32 southern Ontario Holstein herds. Lactation records were divided into three separate health categories based on postpartal disease h...
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Growth rates, measures of ascarid burden, and the levels of anteroventral pneumonia and atrophic rhinitis at slaughter were determined for 352 hogs born between March 8 and March 28, 1987 on 15 farms located in Prince Edward Island. Regression analyses were used to determine associations between ave...
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The frequencies of anteroventral (AV) lung lesions and pleuritis were determined and serological surveys for M. pleuropneumoniae (MH) and A. pleuropneumoniae (AP) were conducted on a minimum of 25 slaughter pigs from each of 18 randomly sampled Prince Edward Island farms (producing over 1000 market ...
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Presentations made at a symposium in July 1988 on the design and conduct of clinical trials for the evaluation of veterinary vaccines, particularly respiratory vaccines for feedlot cattle, appear in this special report. The 7 papers by Ribble, C.S.; Waltner-Toews, D.; Bigras-Poulin, M.; Alexander, D...
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This manuscript presents the results of a review of the effects of recombinant bovine somatotropin (rBST) on dairy cattle health, reproductive performance, and culling, that was carried out by an expert panel established by the Canadian Veterinary Medical Association (CVMA). The panel was establishe...
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The objective of this study was to use several methods to describe the age patterns for risk of death in selected breeds of dogs insured for life in a Swedish animal-insurance company in 1996. Data on eight breeds were analyzed for age at death (including euthanasia). If dogs left the insurance for ...
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The primary objective of this study was to determine the contribution of several management variables to average production per day of life (PPDL). A secondary objective was to compare PPDL between two geographic regions in North America and between dairy herds within the two regions. PPDL was deter...
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A prospective cohort study was undertaken to determine calf-level factors that affect performance (growth) between birth and 14 months of age in a convenience sample of approximately 3300 female Holstein calves born in 1991 on two large Florida dairy farms. Data collected on each calf at birth inclu...
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Pattern diagnosis (establishing a diagnosis of a herd problem based on the distribution of health events within that herd) is only possible if information about the expected, or 'normal' distribution is available. This study examined the distribution of somatic cell count (SSC) patterns in Prince Ed...
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A survey of cases of Nocardia spp. mastitis diagnosed at laboratories throughout Canada between January 1987 and June 1989 was conducted. The frequency of reporting of Norcardia spp. mastitis as measured by the proportion of isolations to milk samples submitted, the incidence of infected cows and th...
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A seasonal population-dynamics matrix model (periodic Leslie-matrix model) was developed to model short production cycles and high seasonal variations occurring in demographic rates and offtake patterns for small ruminants. The year was split into 24- and 15-day phases. Population-size changes were ...
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Effects of age, season and sire on the occurrence of common diseases of Holstein-Friesian cows were evaluated in a two and a half year study. The data were from 2875 lactation records from 2008 cows in 32 commercial dairy herds within a 50 mile radius of Guelph, Ontario. Age patterns for all disease...
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The effect of the level of milk production and previous disease occurrence (both within the same lactation and in the previous lactation) on the risk of disease occurrence in Holstein-Friesian cows were investigated. The data were from 2875 lactation records from 2008 cows in 32 commercial dairy her...
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