Occurrence of gastric ulcers in horses exercised on a treadmill - Ribeiro, Gesiane; Silva, Luis Claudio Lopes Correia da; Belli, Carla Bargi; Vargas, Leonardo Paião; Piffer, Maria Letícia Tescaro; Mirian, Mauricio; Feijó, Vanessa Aparecida; Fernandes, Wilson Roberto (Ciência Rural, 2016)