Do the access to external paddock in collective pen system improve sow and piglets’ health and performance? - Farias, Sharacely de Souza; Santos, Jonathan Vinícius dos; Oliveira, Débora Caroline Gonçalves de; Ruiz, Vera Letticie de Azevedo; Pantoja, Messy Hannear de Andrade; Titto, Cristiane Gonçalves (Acta Scientific Veterinary Sciences, 2022)