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Thirty-six mares, blocked by age and temperament score, were assigned to one of three treatment groups: pasture (P); confinement stalls (C), allowing social contact; isolation stalls (ISS), allowing no contact with conspecifics. After 48 h on treatment, the mares were observed in situ for 1 h. Medium temperament and highly reactive ISS mares spent more time eating grains (P < 0.01) and exhibited more grain-eating bouts (P < 0.03) than P and C mares. Calm P mares had longer forage-eating bouts than C and ISS mares (P < 0.02). During a 15 min open-field test in a 23 m x 23 m pen after 72 h on treatment, ISS mares traveled farther (P < 0.005) than C and P mares, spent more total time trotting (P < 0.01) than C and P mares, and exhibited a greater number of trotting bouts (P < 0.01) than both C and P mares. Isolated mares spent less total time standing during the open-field test than C (P < 0.05) and P (P < 0.01) mares, but exhibited a greater number of standing bouts than C (P < 0.05) and P (P < 0.01) mares. Isolated mares also exhibited a greater number of total activity bouts (P < 0.01) during the open-field test than both C and P mares; P mares also exhibited fewer activity bouts than C mares (P < 0.1). Results indicate that mares kept in confined and isolated environments showed greater motivation for movement and performance of a greater number of activities than those maintained on pasture with conspecifics

Activity. --- Age. --- Behavioral-responses. --- Boxes. --- Conspecific. --- Contact. --- Domestic-animals. --- Environment. --- Environments. --- Equine. --- Field. --- Foals. --- Group. --- Isolation. --- Kept. --- Mare. --- Mares. --- Motivation. --- Movement. --- Open field. --- Open-field test. --- Open-field. --- Pasture. --- Pen. --- Performance. --- Social contact. --- Social isolation. --- Social-isolation. --- Social. --- Standing. --- Stress. --- Temperament. --- Test. --- Time. --- Treatment. --- Welfare.