Resumen

LOBAYAN, S.I. et al. Relevamiento de nematodes gastrointestinales en bovinos del sur de Misiones y nordeste de Corrientes (Argentina). Rev. vet. [online]. 2016, vol.27, n.2, pp.137-140. ISSN 1669-6840.

An observational research of gastrointestinal nematodes of cattle was conducted in 592 weaned calves from 12 breeding herds during 27 months. The area of study comprised the Apóstoles and Capital districts (Misiones Province) and the Ituzaingó and Santo Tomé districts (Corrientes Province), of similar phytogeographic characteristics. Two variables were measured: the number of excreted eggs by the counting method of eggs per gram (epg) of stool, and the proportion of the parasitic genus by stool culture and identification of third stage larvae. In egg counts the median was used because of the asymmetric distribution of the variable as a measure of central tendency, being observed in the total sample a median of 90 epg, and in the seasonal analysis a median of 200 epg in spring, 190 epg in summer and 50 epg in autumn and winter. In the stool culture 21 pools of samples were grown in 8 seasons in a row throughout the whole study and the overall findings were: 30 Haemonchus sp., 26 Trichostrongylus sp., 24 Cooperia sp., and 20 Oesophagostomum sp. The majority participation of high oviposition nematodes, and the relatively low epg counts in faeces -excepting some cases with high values- indicate the necessity to increase the epidemic studies of the regional parasitosis and to establish control measures that reduce their impact in the cattle exploitations.

Palabras clave : cattle; gastrointestinal nematodes; survey; Argentinean northeast.

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