“…When studying classical music for pregnant sows housed in collective stalls, Silva et al (2017) stipulated five point-time observation schedules (9 a.m., 11 a.m., 1 p.m., 3 p.m. and 5 p.m.) and found no differences in the relative frequency of the agonistic behavior of the sows between the pen with the music (0.00, 0.00, 0.00, 0.31 and 0.00; respectively) and pen without the music (0.37, 0.00, 1.14, 0.38 and 1.22; respectively). In contrast, it was found a statistical difference in agonistic interaction with the researcher at all times for pen with (0.00, 0.00, 0.00, 0.00 and 0.00; respectively) and without (1.57, 1.71, 1.28, 1.42 and 1.28; respectively) music.…”