Panzardi, A.; Mellagi, A. P. G.; Bierhals, T.; Gheller, N. B.; Bernardi, M. L.; Bortolozzo, F. P.; Wentz, I. Weight Gain of Pregnant Sows Associated With Their Behavior in Pens and to the Uniformity of Piglets. PAB 2012, 46, 1562-1569.