Osorio-Arce M M and Segura-Correa J C 2011: Gastrointestinal parasite egg counts of Bos taurus x Bos indicus cattle in a dual-purpose system in the Mexican tropics. Livestock Research for Rural Development. Volume 23, Article #160. Retrieved , from http://www.lrrd.org/lrrd23/7/osor23160.htm