Sus scrofa domestica endoparasitic resistance in the Amazonas

The domestic pig (Sus scrofa domestica L.) has been wild breeding in the Varzea Amazonian Estuary area. Without dietary supplement or medical prevention, the pigs survive, bringing economic benefits to local peasants. Endoparasitic diseases generate economic losses because of neonatal death and clinical disease. We assessed the nematoda (O. Nematoda) and coccidia (O. Eucoccidia) parasitic level and tolerance in 75 pigs (0-18 months) from 35 families using the following methods: (i) larvae culture, (ii) Hoffman, (iii) Willis-Mollay (Hoffman 1987) and (iv) postmortem examinations. We identified Eimeria species Strongyloidea and S. ransomi present in 60% of the cases, giving a mean of 336 and 520 EPG (eggs per gram of feces), respectively. Culturing the larvae showed S. ransomi in 47% and Oseophagostomum sp. in 17% of the cases. We found Stephanurus dentatus and Macracanthorhynchus hirudinaceus adults in 77% and 23% of the postmortem tests, respectively. Pig resistance was demonstrated by lack of mortality and no clinical disease symptoms, in the presence of that high endoparasitic load.