Preliminary studies of the epidemiology of nematode parasites in buffalo (Bubalus bubalis L.) in the state of Pará

Abstract

A study of the epidemiology of nematode infections in water-bufallo was made in the State of Pará, Brazil. The following species were involved: Neoascaris vitulorum, Strongyloides papillosus, Ostertagia trifurcata, Cooperia sp., Haemonchus sp., Oesophagostomum, Dictyocaulus viviparus. It was demonstrated that age is fundamental to the contraction and development of nematode infections. Young calves are more susceptible than adults. Pre-natal infection is the most important means of acquiring a Neoascaris vitulorum infection. This species was not observed in calves more than 240 days of age. The intensity and range of distribution of Dictyocaulus and Strongyloides infections were similar to these of Neoascaris. Oesophagostomum is more common in adult bufallo. The species trichostrongylids did not evidence preference for any specific age group. Seasonal influences were also studied. It was concluded that, from the standpoint of nematode infection, summer is the most favorable season for dropping buffalo calves in the Amazon region.