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Published online by Cambridge University Press: 20 November 2017
Genetically resistant sheep have been found to exhibit a significantly higher anti-parasite antibody response than random-breed sheep. Increased concentrations of serum IgG and local IgA have been associated with resistance to gastrointestinal parasites (Gill et al., 1993). In the present study, we examined the levels of IgA antibodies in abomasal mucous of naturally and artificially infected sheep of Santa Inês and Europeans breeds of sheep, respectively, resistant and susceptible to Haemonchus contortus infection (Amarante, et al., 2004).