Our study confirmed that sows spend less time lying than gilts, and they had more time standing, vacuum chewing, and drinker play than gilts. Our results are consistent with previous studies that showed a higher frequency of standing and stereotypies is related to increased parity in tethered sows (Cariolet and Dantzer, 1984; Rushen, 1985; McGlone et al., 1994), and probably increased time in confinement. Results of this and previous studies suggest that experienced sows altered their behavior in confinement housing.