Worm burden and immunological responses in corriedale and crioula lanada sheep following natural infection with Haemonchus contortus - Bricarello, Patrícia Ana; Gennari, Solange Maria; Oliveira-Sequeira, T. C. G.; Vaz, C. M. S. L.; Gonçalves, I. Gonçalves de; Echevarria, F. A. M. (Small Ruminant Research, 2004)