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Doayo (Namchi) Bos taurus with low zebu attributes are tripanotolerant under natural vector challenge.

Achukwi, M.D., Ibeagha-Awemu, E.M., Musongong, G.A., and Erhardt, G. (2009). "Doayo (Namchi) Bos taurus with low zebu attributes are tripanotolerant under natural vector challenge.", Online Journal of Veterinary Research, 13(1), pp. 94-105.

Abstract

Trypanosomosis remains one of the major constraints limiting animal production and productivity in sub-Saharan Africa. Genetic resistance to trypanosomosis in some indigenous cattle breeds offers another option to be included in the approaches currently used in the fight against the disease. Fifteen Doayo or Namchi (Bos taurus) weaners and 22 White Fulani (Bos taurus) weaners were exposed for one year to primary trypanosome infections by natural vector challenge. Seven microsatellite markers with known zebu specific alleles were used to detect and eliminate highly-introgressed individuals of the Doayo breed and White Fulani X Doayo crosses. The packed cell volume (PCV) and trypanosome parasitaemia of the animals were measured every other week. All animals became infected with trypanosomes during the study period. The Doayo cattle down regulated parasitaemia significantly (P<0.005) more than the White Fulani. In both breeds, the PCV declined with increasing time but the pathological effects of trypanosome infection on PCV were significantly higher (P<0.01) in the White Fulani than the Doayo cattle. This clear superiority in resisting PCV drop and excessive rise in parasitaemia over time shown by the Doayo cattle, in spite of the higher incidence of trypanosomosis in the Doayo, implies that the Doayo cattle are trypanotolerant under natural trypanosomosis infection. The proportion of zebu specific alleles could be a pointer to the extent of the dilution or contamination of the taurine genome and indicates, to a large extent, the potential susceptibility of the individual to trypanosomosis. The dwindled population size of the Doayo cattle and crossbreeding with White Fulani remain major causes for concern in the exploitation of this valuable genetic material for the control of animal trypanosomosis in the region.

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