Draft horses have similar outcomes as nondraft horses presenting for colic at a referral institution in Atlantic Canada.

Overview

• This study evaluated the clinical presentation, diagnosis, treatment, and outcomes of draft horses compared to nondraft horses presenting with colic at a veterinary referral hospital in Atlantic Canada.
• The researchers aimed to determine if draft horses had different outcomes or mortality risks than nondraft horses when treated for colic.

Background and Objectives

• Colic, a common condition causing abdominal pain in horses, can be a serious emergency requiring veterinary care.
• Draft horses are larger breeds often used for heavy work, and their colic presentation and outcomes may differ from nondraft breeds.
• The study aimed to:
• Describe clinical findings, diagnoses, treatments, and outcomes for draft horses with colic at the Atlantic Veterinary College referral hospital from 2004 to 2023.
• Compare these parameters between draft and nondraft breeds to identify any significant associations.
• Assess whether being a draft horse influenced the risk of mortality from colic.

Methods

• A retrospective review was conducted on 721 colic cases presenting to the hospital over nearly 20 years.
• Breed classification separated horses into draft (68 cases, 9.4%) and nondraft groups.
• Data collected included clinical findings at admission, type of diagnosis (surgical or medical), treatment approach (medical or surgical), and outcome (survival to discharge or nonsurvival).
• Statistical analyses used logistic regression models to evaluate associations between breed and clinical variables, treatment, and mortality.

Key Findings

• Among draft horses:
• The most common diagnosis was large intestine nonstrangulating obstruction (30.9%).
• Other frequent diagnoses included gastrointestinal medical cases (23.5%) and open surgical cases (19.1%).
• Treatment approaches did not differ significantly between draft and nondraft horses—both medically and surgically managed cases were similar.
• At admission, draft horses showed certain clinical signs more commonly than nondraft horses:
• Increased heart rate.
• Elevated abdominal protein concentration.
• Higher peripheral lactate levels.
• Increased total protein and fibrinogen concentrations.
• Despite these signs often being associated with worse prognosis, 59% of draft horses survived to discharge.
• Multivariable analysis demonstrated that draft status was not a significant predictor of survival or nonsurvival compared to nondraft horses.

Interpretation and Implications

• Although draft horses tended to present with clinical variables traditionally linked to poorer outcomes, their overall survival rates were comparable to nondraft horses in this referral setting.
• This suggests that draft breed alone does not confer an increased risk of death from colic if managed appropriately at a referral hospital.
• Veterinarians should be aware that clinical signs indicating severity may be somewhat more common in draft horses but that prognosis remains guarded but not necessarily worse due to breed.
• The study provides valuable breed-specific information to guide clinical decision-making and discussions with owners regarding expectations and treatment in draft horses.

Limitations and Future Directions

• The study was retrospective and based on cases at a single referral center, which may influence generalizability.
• Further prospective studies could elucidate specific physiological or anatomical factors in draft horses affecting colic presentation and management.
• Additional research might examine long-term outcomes post-discharge and the influence of specific treatment protocols on survival across breeds.