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Year : 1991
Tome : 142
Volume : 2
Pages : 147-152
Title : Cholinesterase activity in bovine ticks and its inhibition in vitro by organophosphates acaricids
Authors : F.A. ABIOLA, M. KARIMOU et P. HOUETO
Summary : The cholinesterase activity and its inhibition by organophosphates were studied in ticks sampled on bovine in Niger and Bénin. Ticks belong to 4 species (Amblyomma variegatum, Boophilus geigyi, Hyalomma impeltatum and Hyalomma marginatum rufipes) and 5 inhibitors were tested (dichlorvos, malathion, malaoxon, coumaphos and coroxon). The cholinesterase activity was higher in Amblyomma (4-12 nmol of hydrolysed acetylthiocholine/h/larva) than in Hyalomma and Boophilus (1-3 nmol/h/larva). The inhibitory dose 50 p. 100 obtained for the acaricids showed a variation of senstivity of ticks among the area where they were sampled. For instance, a Boophilus strain from Niger was 8 times more sensitive to dichlorvos than one from Bénin.
Keywords : ticks - organophosphate acaricids - cholinesterase - sensitivity - cattle.
Correspondence : F.A. ABIOLA
Adress : Département de Pharmacie-Toxicologie - Ecole Inter-Etats des Sciences et Médecine Vétérinaires - B.P. 5077 - Dakar, Sénégal.

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