Auteurs
Title
Abstract
The composition, prevalence, and seasonal dynamic of Gasterophilus species were studied at the slaughterhouse of Constantine region (East Algeria) in 128 horses over an 18 months period. Our survey revealed that 124 (96.9%) horses were infected with a mean intensity of 161 larvae of Gasterophilus spp. Four species of Gasterophilus were identified; Gasterophilus intestinalis and G. nasalis were by far the predominant species with 95.3% and 77.3% respectively, followed by G. haemorrhoidalis (14.0%) and G. pecorum (10.1%). The age, sex, and breed of horses did not affect the distribution of the infection. Second-stage larvae (L2) of G. intestinalis were absent between April and July and present in higher numbers between December and February. In addition, third-stage larvae (L3) were few in number, mainly from September to November, a consequence of their fecal elimination and suggesting that the effective period of adult activity of G. intestinalis is autumn. Therefore, the population dynamics of G. nasalis shows that its activity is two months longer and occurs earlier than that of G. intestinalis. The incidence of G. pecorum infection was linked to the rainiest months.
Keywords
Titre
Résumé
La composition, la prévalence et la dynamique saisonnière des espèces de Gasterophilus (ou gastérophiles) ont été étudiées à l’abattoir de la région de Constantine (est de l’Algérie) chez 128 chevaux sur une période de 18 mois. L’enquête a révélé que 124 (96,9 %) chevaux étaient infectés avec une intensité moyenne de 161 larves de Gasterophilus spp. Quatre espèces de Gasterophilus ont été identifiées. Gasterophilus intestinalis et G. nasalis étaient de loin les espèces prédominantes avec respectivement 95,3 % et 77,3 %, suivis de G. haemorrhoidalis (14,0 %) et de G. pecorum (10,1 %). L’âge, le sexe et la race des chevaux n’ont pas affecté la répartition de l’infection. Les L2 de G. intestinalis étaient absentes entre avril et juillet et présentes en nombre maximum entre décembre et février. De plus, les L3 étaient peu nombreuses principalement de septembre à novembre, une conséquence de leur élimination fécale, ce qui suggère que la période effective d’activité adulte de G. intestinalis est l’automne. La dynamique de population de G. nasalis a montré que son activité était plus longue de deux mois et se produisait plus tôt que celle de G. intestinalis. L’incidence de l’infection à G. pecorum était liée aux mois les plus pluvieux.
Mots-clés
Bibliographie
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