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Climate influences assemblages of abomasal nematodes of sheep on steppe pastures in the east of Algeria

Published online by Cambridge University Press:  01 December 2016

I. Zouyed ,
J. Cabaret  and
B. Bentounsi
I. Zouyed
Affiliation:
Institute of Veterinary Sciences, Constantine 1 University, Constantine, Algeria
J. Cabaret*
Affiliation:
INRA and F. Rabelais University, UMR1252, 37380 Nouzilly, France
B. Bentounsi
Affiliation:
Institute of Veterinary Sciences, Constantine 1 University, Constantine, Algeria
*
*E-mail: [email protected]
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Abstract

It is a common view that assemblages of parasitic nematodes are influenced by climatic conditions; however, there are only a few articles available regarding those that infect farm animals. We investigated the relationship between climate variables and infection with abomasal trichostrongyles in 335 1-year-old rams grazed on steppe pastures in Eastern Algeria. Abomasa were collected from 12 local slaughterhouses located in four climatic areas (from humid to arid) and the worms extracted, identified and counted. The abundance was low and the fauna composed primarily of Teladorsagia circumcincta, Marshallagia marshalli and Trichostrongylus sp. The high percentage of M. marshalli is typical of steppe areas. Ostertagia ostertagi and Haemonchus contortus were present in low numbers. Rainfall was the most important climatic variable related to the main species. This relationship was not linear for M. marshalli but an optimal rainfall was detected (350–400 mm/year). The more complex climatic indicators used in the study did not demonstrate a more significant correlation than rainfall. The predictive value of rainfall on the abundance or proportion of species in the assemblage was modest but highly significant. The seasonality of assemblages was different between the two main sub-climates (sub-humid and semi-arid).

Type
Research Papers
Information
Journal of Helminthology , Volume 92 , Issue 1 , January 2018 , pp. 34 - 41
Copyright
Copyright © Cambridge University Press 2016 

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