An association was found between the vacuum chewing group and total pigs born (P < 0.05). Females showing high relative frequencies (≥36%) of vacuum chewing produced fewer total pigs born (11.5 ± 0.36 vs. 12.5 ± 0.25) than those with no vacuum chewing (Table 4). However, no association was found between the vacuum chewing groups and pigs born alive (P = 0.097) and dead pigs (P = 0.131). No other performance measures, such as previous lactation lengths, birth litter weights, and adjusted 21-d weights were associated with the vacuum chewing groups. No other stereotypies and postural behaviors were associated with any measures in reproductive performance. Finally, the farrowing rate was not related to any postural behavior and stereotypies in logistic regression analyses. The parity group was associated with all reproductive performance measurements (P < 0.05). No two-way interactions between each behavior and parity on any reproductive performance were found.