Antibiotic use among beef cattle farmers in feedlots in Querétaro, Mexico
José Alberto Castañeda-Ramos; Maria Elena Velazquez-Meza; Miguel Galarde-López; José Alfredo Carranza-Velázquez; Ángel Rosendo Pulido-Albores; Susana Flores-Villalva; Emilio Blando-Garay; Berta Alicia Carrillo-Quiroz; Celia Mercedes Alpuche-Aranda;