Eco-epidemiologia de Haemonchus contortus bahienses, ecotipo presente en ovinos de zonas aridas de Venezuela

Abstract

The frequency distribution of female Haemonchus contortus bahiensis Grisi, 1974 in sheep from Venezuelan arid zones is 15.32% for the type with vulvar flap, 51.6% for the vulvar-knob and 33.07% for smooth type. A Shannon-Weaver diversity index corresponding to 1.44 bits was calculated for these forms with similarities in the general size, egg-size and in the number of the longitudinal cuticular ridges. An aggregated kind of distribution in the host population according to the K parameter of a negative binomial distribution was recorded for male and female worms. A complicated interaction was observed between the abundance, aggregation and prevalence of this ecotype and the importance of these findings is discussed with regard to host-parasite relationships.

Prevalence, effects and alternative control methods of Haemonchus contortus in small ruminants: A review

“…Measuring about 15 to 30 mm long, an adult H. contortus male is shorter than the female. H. contortus male is characterized by its copulatory bursa formed of two large lateral lobes and a small asymmetrically positioned dorsal lobe (Morales and Pino, 1987). Female parasites have a reddish digestive tube containing ingested blood, spirally surrounded by two white genital cords (Getachew et al, 2007).…”