Kinetics of infestation by Haemonchus contortus and response of resistant (Martinik Black Belly) and susceptible (Lacaune) sheep breeds
DOI:
https://doi.org/10.19182/remvt.31874Keywords
Lacaune, Martinik Black Belly sheep, Haemonchus contortus, resistance to anthelmintics, immune response, nematode infections, experimental infectionAbstract
The extension of resistance of gastrointestinal nematodes to anthelmintics, recently observed in Haemonchus contortus, represents a real problem and makes it urgent to find alternative solutions such as the selection of helminth-resistant animals. All cases of experimental infestations show significant individual
variability in egg excretion, allowing good discrimination between resistant and susceptible individuals, which enables selecting resistant individuals in the studied breeds. However, the lack of knowledge on immune response mechanisms in sheep worms is an obstacle to the development of this selection. It is known that the excretion level of parasite eggs in feces is a relevant indicator for assessing the resistance of an animal to worms. This criterion was examined in the present study carried out with two French sheep breeds, the Martinik Black Belly (resistant) and the Lacaune (sensitive). The sheep were infested orally with a single dose of 10,000 L3 larvae of H. contortus. The sheep response was monitored during antemortem and postmortem examinations. The results clearly showed that during a first H. contortus infestation there was a significant difference between the parasite populations (parasite intensity and egg production) and between certain pathophysiological parameters (blood and tissue eosinophilia) observed in the two sheep breeds.
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© M.Benguesmia et al., hosted by CIRAD 2020
This work is licensed under a Creative Commons Attribution 4.0 International License.