Crib-biting in US horses: breed predispositions and owner perceptions of aetiology.
Authors: Albright J D, Mohammed H O, Heleski C R, Wickens C L, Houpt K A
Journal: Equine veterinary journal
Summary
# Crib-biting in US horses: breed predispositions and owner perceptions of aetiology Crib-biting affects approximately 4.4% of US horses overall, but prevalence varies substantially by breed, with Thoroughbreds showing significantly higher rates than other breeds—a finding that suggests genetic predisposition plays a meaningful role alongside management factors. Using postal surveys and follow-up questionnaires, researchers quantified breed-specific odds ratios and examined owner perceptions about causation, finding that whilst nearly 55% of owners attributed crib-biting predominantly to environmental factors and 49% believed horses learn the behaviour through observation, only 1% of surveyed horses actually developed the habit after exposure to affected individuals. Conspecific contact showed no statistically significant relationship with crib-biting risk despite 86% of horses being turned out together, directly contradicting the widespread belief in social transmission of the behaviour. These findings suggest that isolation of affected horses—commonly practised to prevent spread—may be counterproductive and cause unnecessary stress, whilst the substantial breed differences point toward an underlying genetic vulnerability that warrants investigation into breeding lines and individual predisposition. For practitioners, this work challenges the assumption that crib-biting is primarily a learned vice or solely an environmental problem, supporting instead a more nuanced approach that considers breed-specific susceptibility and questions the necessity of isolating affected animals.
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Practical Takeaways
- •Thoroughbred owners should be counselled about elevated genetic risk for crib-biting; isolation of affected horses is not evidence-based and may cause unnecessary stress
- •The minimal incidence of crib-biting transmission through observation suggests that keeping affected and unaffected horses together is safe management practice
- •Investigate underlying genetic and constitutional factors in predisposed breeds rather than focusing solely on environmental management modifications
Key Findings
- •Overall prevalence of crib-biting in US horses was 4.4%, with Thoroughbreds most affected at 13.3%
- •Only 1.0% of horses became crib-biters after exposure to affected individuals, contradicting the common belief that it is learned behaviour
- •54.4% of owners attributed crib-biting to environmental factors and 48.8% believed it was learned, yet extent of conspecific contact showed no statistical relationship to risk
- •Genetic predisposition appears more significant than management conditions in determining breed susceptibility to crib-biting