Table of Contents and Abstracts

This retrospective study describes clinical presentation, diagnostic approach, treatment, and outcome for goats with presumptive cerebrospinal nematodiasis. A presumptive diagnosis was made based on neurologic signs, results of cerebrospinal fluid analysis, and response to treatment. Six goats were identified that met inclusion criteria. Cerebrospinal fluid analysis revealed eosinophilic pleocytosis (total nucleated cell count: 12 to 430/µL, 33 to 89% eosinophils). All 6 goats were treated with fenbendazole and anti-inflammatory drugs (NSAIDs ± corticosteroids) and 4 received physical rehabilitation therapy. At discharge or follow-up, all 6 goats were ambulatory and had minimal neurologic deficits.

Key clinical message:
In goats, cerebrospinal nematodiasis caused by Parelaphostrongylus tenuis is often a presumptive diagnosis based on neurologic signs, shared habitat with white-tailed deer, eosinophilic pleocytosis, and response to anthelmintic therapy. Presumptive cases in goats have many similarities to confirmed cases in camelids. Further study is indicated to characterize the clinical signs and optimize the diagnosis and treatment of goats infected with P. tenuis.

Ammonia is a major neurotoxic substance associated with the complex pathogenesis of hepatic encephalopathy. Although several primary and secondary conditions have been reported to cause hyperammonemia, in veterinary medicine this condition is considered primarily associated with hepatic disease or portosystemic shunting. Only a few cases of inherited urea cycle enzyme deficiency and organic acid metabolic disorders have been reported in cats with hyperammonemia. To the best of our knowledge, this is the first report of hyperammonemia in a cat caused by accumulation of methylmalonic acid (MMA) secondary to functional cobalamin deficiency.

A 2-year-old spayed female Turkish Angora cat exhibited postprandial depression with a 3-month history of hyperammonemia. Serum protein C and bile acid concentrations were normal. Plasma amino acid analysis revealed a deficiency of urea cycle amino acids. Although the serum cobalamin concentration was markedly high, there was no evidence of inflammatory, hepatic, or renal disease or neoplasia on blood, ultrasonographic, and computed tomographic examination. Gas chromatography-mass spectrometry revealed a high MMA concentration in the urine. Based on the results, functional cobalamin deficiency was diagnosed. Following oral amino acid supplementation and initiation of a low-protein diet, the serum ammonia level returned to normal and the postprandial depression improved. Urea cycle amino acid deficiency secondary to functional cobalamin deficiency presumably caused hyperammonemia due to MMA accumulation in this case.

A 9-year-old neutered male American pine marten (Martes americana) was referred for further evaluation of suspected lymphoproliferative disease. On physical examination, the pine marten was determined to be in an underconditioned state with an enlarged right mandibular lymph node. Hematology revealed a marked leukocytosis characterized by a lymphocytosis. Flow cytometry performed on peripheral blood was suggestive of a CD4⁺ T-cell lymphoproliferative disease. Whole-body radiographs demonstrated a large cranial mediastinal mass and splenomegaly. These findings were confirmed using ultrasound, which also identified intra-abdominal lymphadenopathy and splenic nodules. Cytologic evaluation of aspirates from the mediastinal mass was interpreted as possible lymphoma. The pine marten was treated with chlorambucil and prednisolone and achieved a durable partial remission. Twelve months after initial diagnosis, progressive disease was noted and treatment with lomustine was initiated as a rescue protocol until euthanasia, which was carried out 15 mo after the initial diagnosis. Based on a literature search, this is the first case report describing the management of peripheral T-cell lymphoproliferative disease, presumably peripheral lymphoma, in a pine marten; this neoplasm should be considered as a differential diagnosis in pine martens that have abnormal complete blood cell count findings and enlarged lymph nodes.

Key clinical message:
This report describes the diagnosis and management of a peripheral T-cell lymphoproliferative disease, presumably peripheral lymphoma, in an American pine marten (Martes americana). This is the first report of this disease and its successful treatment in a pine marten.

A five-month-old alpaca cria presented with a history of abdominal pain, dysuria, and a recurring rectal prolapse. An ultrasonographic examination indicated a urachal abscess attached to the urinary bladder. The abscess was removed surgically, and the patient had an adequate recovery after the procedure and ancillary treatment. This case report highlights secondary complications that could arise following an infection of the urachus in new-world camelids.

Key clinical message:
Urachal abscess should be considered as a differential diagnosis in juvenile new-world camelids with rectal prolapse, tenesmus, or dysuria.

A 2-year-old Holstein cow weighing 530 kg at 2 mo gestation was scheduled for a paracostal laparotomy and abomasotomy following diagnosis of a reticular foreign body causing obstruction and abomasal impaction. Hemorrhagic shock occurred during surgery, with a rapid, approximately 60% decrease in arterial blood pressure, and reflex tachycardia with a 2-fold increase in heart rate. Following identification of hemorrhagic shock, arterial blood pressure was supported by reducing the inhalant anesthetic requirement, positive inotropic support (IV dobutamine infusion), and IV fluid therapy. Hypertonic saline was administered IV for initial resuscitation of arterial blood pressure, followed by a whole blood transfusion to replenish red blood cells, support oxygen-carrying capacity, and provide intravascular volume to maintain cardiac output and tissue perfusion. A gradual increase in arterial blood pressure and a decrease in heart rate were observed in response to treatment. This case report demonstrates the physiologic compensatory response to hemorrhagic shock and the treatment to stabilize cardiovascular parameters in an anesthetized cow.

Key clinical message:
This case illustrates the physiological reponses to acute hemorrhage under general anesthesia and the effects of various treatment interventions.

Objective
This cross-sectional study aimed to evaluate serum total protein (STP) concentrations in surplus calves in British Columbia and explore associated factors including calf breed, sex, hydration, month of sampling, and frequency of calf pickup.

Animal
Neonatal dairy and dairy-beef crossbred calves recently purchased from dairy farms and transported to an assembly facility.

Procedure
Calves included in this study (N = 1449) were assessed at an assembly facility from March to August 2021, and blood samples were collected to measure STP as an indicator of transfer of passive immunity (TPI). Associations between STP and calf characteristics (breed, sex, hydration), month of sampling, and how frequently calves were collected from the source dairy farms (daily versus twice weekly or less) were evaluated with a linear regression model including farm as a random effect.

Results
Of the 1433 serum samples, 24% had STP concentrations that were “poor:” defined as < 5.1 g/dL, and the proportion with poor STP varied widely among farms. Dairy-beef crossbred calves and calves that were dehydrated had higher STP concentrations, whereas those sampled in July had lower STP. This study was limited to calves purchased by 1 calf buyer but represented a large number of calves from 12% of the dairy farms in British Columbia.

Conclusion
Approximately 1/4 of surplus dairy calves had poor STP concentrations.

Clinical relevance
Ensuring surplus dairy calves have successful TPI is an important opportunity to bolster their health and welfare.

Objective
Primary objectives of this study were to determine presenting complaints, physical examination, clinicopathologic findings, and hospitalization time of dogs with spontaneous hypoadrenocorticism presenting with critical disease; and to compare those end points to dogs with a more stable presentation. Secondary objectives were to evaluate the shock index and to identify precipitating stressors.

Animals
Eighty-four dogs at the Western College of Veterinary Medicine between 1998 and 2018 were included.

Procedure
Data were retrieved from the medical records.

Results
Collapse and depression were more common among critically ill dogs. Hyperlactatemia was rare despite a diagnosis of hypovolemic shock, and a shock index was ineffective in this patient subset. Isosthenuria, total hypocalcemia, and more severe acidosis were more common (P < 0.05) in critical dogs. Owner separation was the most common precipitating stressor.

Conclusion and clinical relevance
We concluded that the critical Addisonian dog has unique characteristics that may aid in early disease identification.

Objective
Surveillance data on companion animals in western Canada are extremely limited. Previous research by the principal investigators established a list of potential canine pathogens of relevance to public health for inclusion in the Western Canadian Companion Animal Surveillance Initiative (CASI). Our objective was to assess veterinary interest in contributing to companion animal surveillance, and to gather baseline data on specific canine pathogens of interest to create surveillance-specific case definitions.

Procedure
An invitation to participate in an online survey was disseminated to all clinical veterinarians across the provinces of Alberta, Saskatchewan, and Manitoba.

Results
There was a moderate level of interest (median: 7.5/10) from veterinarians to participate in the surveillance of companion animals. The majority (85%, 51/60) of veterinarians participating in the survey recorded diagnosing at least 1 of the pathogens of interest over a 5-year interval. Based on survey responses, several surveillance case definitions were formulated for pathogen groups of interest, most of which require laboratory testing for confirmation.

Conclusion and clinical relevance
This study identified the willingness, practicality, and importance of veterinarians or veterinary clinics participating in companion animal surveillance.

Objective
Describe concentrations of brain-derived neurotrophic factor (BDNF) detectable in piglet sera before and after road transport, and evaluate the correlation of serum BDNF with other physiological parameters used to assess swine welfare.

Animals
Commercial crosses of piglets that underwent weaning and transport at approximately 3 wk of age.

Procedure
Sixteen piglets were randomly selected from a larger study for complete blood counts, serum biochemistry testing, cortisol assays, and BDNF assays. Samples were collected 1 d before transport and immediately after transport (> 30 h) under commercial conditions. We assessed the change in serum BDNF concentration; and the correlations between serum BDNF and serum cortisol, neutrophil to lymphocyte ratios (N:L), glucose, and hematological indicators of muscle fatigue.

Results
Serum BDNF concentrations increased after transport (P < 0.05) and changed inversely compared to cortisol and N:L. Consistent correlations between BDNF and other physiological parameters were not observed. High inter-pig variation in serum BDNF was present at both sample times.

Conclusions
Serum BDNF may be used as an additional indicator of swine welfare. Further research characterizing piglet BDNF concentrations in response to conditions promoting positive or negative affective states would be valuable.

Clinical relevance
This communication discusses common hematological parameters used to quantify changes in pig welfare and introduces BDNF, which is a parameter of interest in human cognitive functioning research that may be useful for evaluating the effect of exposure to beneficial or aversive stimuli in animals. The implications of variation in sample collection, handling, and storage procedures for BDNF detection are highlighted.

Some early reports concluded aerosol transmission of porcine reproductive and respiratory syndrome virus between swine farms was unlikely, but most current information suggests the opposite; in many situations it may be the most important contamination source. Aerosol transmission can apparently occur over several km, but more information is required to confirm and better quantify possible distances.