| host specificity of sheep and cattle nematodes in são paulo state, brazil. | the trial was carried out to investigate parasite host specificity and to analyse the dynamics of infection with nematodes parasitizing sheep and cattle raised together or separately in são paulo state, brazil, and, also to clarify doubts about the systematics of species of the genus haemonchus on the basis of cytological and morphological studies. ten steers and 32 ewes were randomly assigned to three paddocks (p), as follows: p1, 5 steers; p2, 5 steers and 16 ewes; and p3, 16 ewes. the animals ... | 1997 | 9477496 |