The performance characteristics of the trypanotolerant cattle breeds, the N'Dama, Keteku and N'Dama x Keteku, were investigated under commercial ranching conditions in the Humid Tropics of Nigeria. Age at first calving under the high tsetsefly challenge and predominantly native range environment was 47.6, 47.0 and 46 mo while average calving interval was 631, 642, and 607 d respectively for the three genotypes. The number of calves produced per cow was similar in N'Dama and Keteku but significantly higher in N'Dama x Keteku crossbreds. Most calves were dropped during the dry season while the average calving rate between 1957 and 1974 was 63.5%. Calf mortality averaged 5% while adult mortality was about 1% thus confirming the adaptability of these trypanotolerant genotypes to the harsh environment of the Humid Tropics. The annual offtake rates on the ranch averaged 13.4%.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume IX. Breeding programs for dairy and beef cattle, water buffalo, sheep, and goats., , 325–330, 1986
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