Updates on rumiant production and medicine: XXVI World Buiatrics Congress - Wittwer, Fernando; Chihuailaf, Ricardo; Contreras, Horacio; Gallo Steigmaier, Carmen Beatriz; Kruze, Juan; Lanuza Ayerdi, Francisco; Letelier, Claudia; Monti, Gustavo; Noro, Mirela (Fernando Wittwer, 2010)