Fleece variation in alpaca (Vicugna pacos): a two-locus model for the Suri/Huacaya phenotype.

BMC Genetics
Silvano PresciuttiniCarlo Renieri

Abstract

Genetic improvement of fibre-producing animal species has often induced transition from double coated to single coated fleece, accompanied by dramatic changes in skin follicles and hair composition, likely implying variation at multiple loci. Huacaya, the more common fleece phenotype in alpaca (Vicugna pacos), is characterized by a thick dense coat growing perpendicularly from the body, whereas the alternative rare and more prized single-coated Suri phenotype is distinguished by long silky fibre that grows parallel to the body and hangs in separate, distinctive pencil locks. A single-locus genetic model has been proposed for the Suri-Huacaya phenotype, where Huacaya is recessive. Two reciprocal experimental test-crosses (Suri x Huacaya) were carried out, involving a total of 17 unrelated males and 149 unrelated females. An additional dataset of 587 offspring of Suri x Suri crosses was analyzed. Segregation ratios, population genotype frequencies, and/or recombination fraction under different genetic models were estimated by maximum likelihood. The single locus model for the Suri/Huacaya phenotype was rejected. In addition, we present two unexpected observations: 1) a large proportion (about 3/4) of the Suri animals are segregat...Continue Reading

References

Dec 17, 2004·Genetics, Selection, Evolution : GSE·Ian William Purvis, Ian Robert Franklin
Sep 1, 2010·Animal : an International Journal of Animal Bioscience·D Allain, C Renieri

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Citations

Oct 23, 2015·Animal Reproduction Science·A CruzJ P Gutiérrez
Sep 20, 2020·Acta Veterinaria Scandinavica·Stéphanie Mali JostPatrik Zanolari
Mar 16, 2017·Veterinary Ophthalmology·Jessica E McDonaldNicole E MacLaren

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