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Title: Mapping of quantitative trait loci controlling trypanotolerance in a cross of tolerant West African N'Dama and susceptible East African Boran cattle
Contributor(s): Hanotte, O (author); Ronin, Y (author); Soller, M (author); Teale, A (author); Agaba, M (author); Nilsson, P (author); Gelhaus, A (author); Horstmann, R (author); Sugimoto, Y (author); Kemp, S (author); Gibson, John Paul  (author); Koral, A (author)
Publication Date: 2003
DOI: 10.1073/pnas.1232392100
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Abstract: Trypanosomosis, or sleeping sickness, is a major disease constraint on livestock productivity in sub-Saharan Africa. To identify quantitative trait loci (QTL) controlling resistance to trypanosomosis in cattle, an experimental cross was made between trypanotolerant African N'Dama (Bos taurus) and trypanosusceptible improved Kenya Boran (Bos indicus) cattle. Sixteen phenotypic traits were defined describing anemia, body weight, and parasitemia. One hundred seventy-seven F₂ animals and their parents and grandparents were genotyped at 477 molecular marker loci covering all 29 cattle autosomes. Total genome coverage was 82%. Putative QTL were mapped to 18 autosomes at a genomewise false discovery rate of <0.20. The results are consistent with a single QTL on 17 chromosomes and two QTL on BTA16. Individual QTL effects ranged from ≈6% to 20% of the phenotypic variance of the trait. Excluding chromosomes with ambiguous or nontrypanotolerance effects, the allele for resistance to trypanosomosis originated from the N'Dama parent at nine QTL and from the Kenya Boran at five QTL, and at four QTL there is evidence of an overdominant mode of inheritance. These results suggest that selection for trypanotolerance within an F₂ cross between N'Dama and Boran cattle could produce a synthetic breed with higher trypanotolerance levels than currently exist in the parental breeds.© 2009 by the National Academy of Sciences of the United States of America.
Publication Type: Journal Article
Source of Publication: Proceedings of the National Academy of Sciences, 100(13), p. 7443-7448
Publisher: National Academy of Sciences
Place of Publication: United States
ISSN: 0027-8424
Field of Research (FOR): 070201 Animal Breeding
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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