title: Trypanotolerance. an individual not a breed character.
abstract: Ten animals from a reputedly trypanosensitive bovine breed, the Zebu, and ten from a reputedly trypanotolerant breed, the Baoulé, were exposed to natural trypanosome challenge in an area of high Glossina density. The ten Zebus and five of the Baoulés died within 6 to 11 weeks with heavy parasitaemia and severe anaemia. The five other Baoulés showed little or no parasitaemia, no anaemia and were all in good condition after weeks of exposure: Seven animals of a herd of Baoulé/Ndama crosses indigenous to the same area were followed concurrently and showed very rare or no patent parasitaemia. Clearly, only some individuals within a "trypanotolerant breed" are able to withstand natural fly challenge. Selection of trypanotolerant animals has to be done on an individual basis and not on the biometrical characteristics of the breed.
mesh_terms: D000818:Animals; D001947:Breeding; D002050:Burkina Faso; D002417:Cattle; D007113:Immunity, Innate; D008297:Male; D014353:Trypanosomiasis, African / Q000276:immunology / Q000662:veterinary; D014354:Trypanosomiasis, Bovine / Q000276:immunology*; D014370:Tsetse Flies