Estudo da frequência e patogenicidade causada por Oesophagostomum (Molin, 1861) em Sus scrofa L., 1758 no Estado do Rio de Janeiro

Abstract

During the period of March to December, 1977, 60 pigs born and raised in the State of Rio de Janeiro were examined for the occurrence of epecies of Oesophagostomum. O. quadrispinulatum (Marcone, 1901) was observed for the first time in this State. The relative occurence of O. dentatum (Rudolphi, 1803) alone or with O. quadrispinulatum was recorded. Observations were made on the presence of adult worms, and nodules with respect to the age of the host, breed, localisation of lesions, and effects on live weight gains. Variations in the number and dimensions of lesions were recorded, as well as macroscopic and microscopic pathology. Experimental infections of worm-free pigs increasing doses of larvae obtained by culture from mixed infection of O. dentatum and O. quadrispinulatum complemented data from the field. The clinical picture observed was not considered pathognomonic. A relation could be seen, however, between the number of larvae administered and the resulting lesions. An attempt is made to estimate losses due to Oesophagostomiasis in swine in the State of Rio de Janeiro.