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...

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...

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 ...

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...

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...

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 ...

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...

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 ...

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...

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...

This manuscript presents the results of a review of the effects of recombinant bovine somatotropin (rBST) on milk production, milk composition, dry matter intake, and body condition score that was carried out by an expert panel established by the Canadian Veterinary Medical Association (CVMA). The p...

Fresh milk samples and potassium dichromate preserved milk samples were stored at both ambient, approximately 21 degree C, and refrigerator temperatures, 3-5 degree C, for varying lengths of time before somatic cell counts were performed on an electronic particle counter. Fresh milk samples stored a...

OBJECTIVE: To determine anatomic patterns and clinical importance of increased radiopharmaceutical uptake in bones of horses used for show jumping, hunting, and eventing. DESIGN: Retrospective study. ANIMALS: 141 horses evaluated because of lameness. PROCEDURE: Medical records were reviewed, and inf...

A mail survey of Canadian sheep flocks registered on the Record of Performance program was conducted, and the association of management practices and diseases with productivity was studied using multiple regression techniques. The relationships between management practices and diseases of lambs whic...

Regression analysis was used to determine the ability of a number of biological parameters to predict economic efficiency. Detailed feed, financial, and production records were maintained by a random sample of eighteen Prince Edward Island (PEI) swine producers (each producing over 1000 market hogs ...

The pharmacokinetic parameters of erythromycin in foals were determined following intravenous administration of 5.0 mg/kg to animals aged 1, 3, 5 and 7 weeks. The distribution of the drug was described by a two-compartment open model, and no significant differences were observed between coefficients...

Path analysis was used to determine the interrelationships between postpartum administration of gonadotrophin releasing hormone and cloprostenol and the occurrence of reproductive disease and reproductive performance in dairy cows. The data analysed were those collected on 226 Holstein-Friesian cows...