Pattern of social interactions after group integration: a possibility to keep stallions in group.
Authors: Briefer Freymond Sabrina, Briefer Elodie F, Von Niederhäusern Rudolf, Bachmann Iris
Journal: PloS one
Summary
# Editorial Summary Stallions are routinely housed in individual stables despite the substantial welfare benefits of group living, largely because the intense aggression displayed during initial encounters deters owners from attempting communal management. Researchers at the Swiss National Stud observed two cohorts of breeding stallions (5 animals in 2009, 8 in 2010) integrated onto large pasture and tracked their social behaviour patterns, dominance hierarchy formation, and the influence of prior group-housing experience across the critical post-integration period. Agonistic interactions peaked at introduction but declined sharply within three to four days and stabilised at minimal levels thereafter, whilst ritual interactions dominated the overall behavioural repertoire; a stable hierarchy emerged within 2–3 months, and stallions with previous group-housing experience displayed fewer aggressive, ritualistic, and affiliative interactions overall. These findings suggest that group housing of breeding stallions is genuinely feasible when sufficient space is provided, as the welfare risks associated with acute aggression are confined to a brief establishment phase rather than representing an ongoing concern. For practitioners managing stallions, this work implies that temporary acceptance of elevated aggression during the first week post-integration need not preclude longer-term group systems that improve welfare, reduce labour demands, and mirror the natural bachelor-band dynamics observed in feral populations.
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Practical Takeaways
- •Aggressive interactions peak only in the first 3-4 days of introducing unfamiliar stallions—if animals survive this critical period without severe injury, group living becomes sustainable
- •Prior experience matters: stallions housed together before show less conflict when re-grouped, suggesting annual group rotation is feasible management practice
- •Large pasture systems (adequate space for bachelor bands) reduce labor costs while improving welfare compared to individual stabling, making this economically viable for breeding operations
Key Findings
- •Agonistic interactions decreased rapidly within the first 3-4 days of group integration and remained minimal thereafter
- •A stable dominance hierarchy was established within 2-3 months of group housing
- •Stallions with prior group housing experience showed fewer agonistic, ritual, and affiliative interactions during re-integration
- •Breeding stallions can be successfully housed together on large pastures (5-8 animals) with manageable injury risk after the initial integration period