Morphological polymorphism in the nematode Teladorsagia circumcincta in relation to age of larvae, infection mode and lamb characteristics in experimental conditions

Variations in the proportion of the less-frequent morph of Teladorsagia circumcincta, T. c. trifurcata, were studied under experimental conditions. Infections with older larvae (over 7 months of age at 4°C) yield a lower proportion of T. c. trifurcata compared with those obtained from fresh larvae (...

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Bibliographic Details
Published in:International journal for parasitology 1995-10, Vol.25 (10), p.1173-1177
Main Authors: Suarez, V.H., Cabaret, J., Gruner, L.
Format: Article
Language:English
Subjects:
Animals
Biological and medical sciences
Disease Models, Animal
Female
Fundamental and applied biological sciences. Psychology
Invertebrates
Larva
Male
Morphology. Histology. Cytology
Nemathelminthia. Plathelmintha
Sheep
Sheep Diseases - parasitology
Trichostrongyloidea - anatomy & histology
Trichostrongyloidea - physiology
Trichostrongyloidiasis - parasitology
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Summary:Variations in the proportion of the less-frequent morph of Teladorsagia circumcincta, T. c. trifurcata, were studied under experimental conditions. Infections with older larvae (over 7 months of age at 4°C) yield a lower proportion of T. c. trifurcata compared with those obtained from fresh larvae (15 days). This phenomenon could account for the reduction in the proportion of the morph trifurcata in two isolates that were acclimated to laboratory rearing for several generations. The infection mode (single or trickle infections) did not significantly modify the proportions of both morphs. The morph trifurcata was found in higher proportions (>5.5%) in more susceptible male and/or Romanov lambs, and in lower proportions (
ISSN:0020-7519
1879-0135
DOI:10.1016/0020-7519(95)00049-8