An ordinary differential equation model was developed to simulate dynamics of Staphylococcus aureus mastitis. Data to estimate model parameters were obtained from an 18-month observational study in three commercial dairy herds. A deterministic simulation model was constructed to estimate values of t...

In a study of susceptibilities of sows from 2 herds to experimentally induced Escherichia coli mastitis, a marked difference was seen. The "susceptible" sows were from a conventional herd and "resistant" sows were from a specific-pathogen-free herd. The purpose of the study was t...

Bilateral hypoplasia of the soft palate and aspiration pneumonia occurred in a Standardbred foal. The filly was presented with a history of illthrift, dyspnoea, coughing and bilateral nasal discharge. Abnormal sounds (crackels and wheezes) were auscultated over all lung fields and the cervical trach...

Background: The proportion of geriatric horses within the equine population has increased in the past decade, but there is limited information on the immune function of these animals. Hypothesis: Aged horses will have a lesser increase in serum antibody response to vaccination. Animals: Thirty-four ...

The effects of dietary lipid levels on growth, feed utilization, hepatosomatic index (HSI), liver lipid deposition and tissue fatty acid composition in haddock were investigated. Triplicate tanks of juvenile haddock (6.9 g) were fed graded levels of herring oil to supply 14, 16, 19 and 22% lipid (DM...

Lupins were roasted in a flame roaster with an exit temperature of 105 degrees C. The effect of heating on protein solubility and rumen degradability of lupin were evaluated by chemical and Dacron bag procedures. Solubility of nitrogen in buffer was reduced from 69.8% in raw lupin to 35.8% in roaste...

Lower fertility of preserved stallion semen may be caused by damage to the spermatozoa or premature capacitation during storage. We investigated the use of the flavonoid, quercetin, with a standard skim milk extender for storage of stallion spermatozoa to prevent premature capacitation and acrosome ...

Four hundred eighty mature marine mussels (Mytilus edulis) were collected in late April from a mussel lease in an estuary in Prince Edward Island, Canada. Squash preparations made of reproductive gland (mantle) tissue of each mussel were stained with Wright-Giemsa stain and were examined by one inve...

A retrospective cross-sectional survey of dog-owning veterinary clients was undertaken in 1996 in three Canadian provinces (New Brunswick, Nova Scotia, and Prince Edward Island) to generate a population of dogs for future use in a more detailed survey on canine behaviour. The questionnaire was desig...

Five serological assays: the buffered plate antigen test, the standard tube agglutination test, the complement fixation test, the hemolysis-in-gel test and the indirect enzyme immunoassay were diagnostically evaluated. Test data consisted of results from 1208 cattle in brucellosis-free herds, 1578 c...

The effect of an intravenous infusion of gonadotrophin releasing hormone (GnRH) on the duration of postpartum anestrus in suckled beef cows was studied. Twenty-eight, mature, suckled beef cows were assigned in equal numbers to one of four treatment groups which were based on infusion with saline or ...

All current approaches to manipulating the reproductive biology of the nonpregnant mare are discussed.

The effects of dietary lipid from 4 experimental diets on the fatty acid composition and cholesterol content of spermatozoa and their plasma membranes and their consequences for sperm viability after cryopreservation were evaluated in rainbow trout. The 4 sources of lipid were herring oil (adequate ...

Serum samples were collected from 10 healthy geldings every 4 h for three consecutive days and the triiodothyronine (T3) and thyroxine (T4) concentrations determined by radioimmunoassay. There were significant differences in the hormone concentrations related to time. The mean (+/- sd) T3 concentrat...

OBJECTIVE: To determine the value of a commercially available test for measurement of luteinizing hormone (LH) concentrations for its use in distinguishing between ovariectomized and sexually intact bitches. DESIGN: Prospective longitudinal cohort study. ANIMALS: 101 sexually intact bitches and 199 ...

Factors which influence somatic cell counts in bovine milk are reviewed and guidelines for their interpretation are presented. It is suggested that the thresholds of 300 000 and 250 000 cells/ml be used to identify infected quarters and cows respectively. However, it is stressed that somatic cell co...

Three horses from one farm were suspected of being poisoned as a result of ingesting white snakeroot plants (Eupatorium rugosum). Severe depression and rear-limb ataxia were the most striking clinical signs found. In addition, evidence of right heart failure and electrocardiographic abnormalities we...

Sweet white lupins (Lupinus albus) and a high protein variety of soyabeans, AC Proteus (HPSB), were roasted in an electric roaster at 300 degrees C for 1, 2, 3 or 4 min. Raw and roasted samples were analysed for total nitrogen, acid detergent insoluble N and protease insoluble N, and available rumen...

The objectives of this study were: 1) to determine if bulk tank milk urea nitrogen (BTMUN) and whole herd weighted average of the individual cow MUN levels (WHMUN) were equivalent measurements of herd MUN status; and 2) to determine the seasonal variation in BTMUN concentrations in Prince Edward Isl...

Blood and urine samples collected from 12 mares at frequent intervals from 25 to 210 d of pregnancy were analyzed for equine chorionic gonadotropin (eCG). Blood and urine samples were collected daily through two consecutive ovulatory periods from five cyclic mares for comparative purposes. Separate ...