[Ticks and hemoparasitoses of livestock in Senegal. VI. The Soudano-Sahelian zone].

The authors report the results of a study on ticks and hemoparasitoses among cattle, sheep and goats in the Sudano-Sahelian zone. During a period of 15 months, ticks were systematically removed from 40 cattle, 40 sheep and 40 goats in order to assess the population dynamics and determine more accurately the preferential sites of settlement of the different species. The following species were collected in ruminants: Hyalomma truncatum, H. marginatum rufipes, Rhipicephalus evertsi evertsi, Rh. guilhoni, Amblyomma variegatum, Boophilus decoloratus. Concurrently, studies were made on hemoparasitoses using blood smears and splenectomy. The following species were found in cattle: Anaplasma marginale, Ehrlichia bovis, Theileria mutans. Infections detected in sheep and goats were caused by Anaplasma ovis, Ehrlichia ovina and Theileria ovis. The PCV values of apparently healthy nature animals as well as the seasonal variations in this hematological parameter were investigated.