Examinando por Autor "Valbonesi, Alessandro"

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Fleece variation in alpaca (Vicugna pacos): A two-locus model for the Suri/Huacaya phenotype
(Springer Nature, 2010-07-20) Presciuttini, Silvano; Valbonesi, Alessandro; Apaza, Nolberto; Huanca Mamani, Teodosio; Renieri, Carlo
Background: 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.Results: Two reciprocal experimental test-crosses (Suri × Huacaya) were carried out, involving a total of 17 unrelated males and 149 unrelated females. An additional dataset of 587 offspring of Suri × 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 segregating (with at least one Huacaya offspring), even in breeding conditions where the Huacaya trait would have been almost eliminated; 2) a model with two different values of the segregation ratio fit the data significantly better than a model with a single parameter.Conclusions: The data support a genetic model in which two linked loci must simultaneously be homozygous for recessive alleles in order to produce the Huacaya phenotype. The estimated recombination rate between these loci was 0.099 (95% C.L. = 0.029-0.204). Our genetic analysis may be useful for other species whose breeding system produces mainly half-sib families
Inheritance of white, black and brown coat colours in alpaca (Vicuna pacos L.)
(Elsevier, 2011-05-10) Valbonesi, Alessandro; Apaza, Nolberto; La Manna, Vincenzo; Gonzáles Castillo, Mario Lino; Huanca Mamani, Teodosio; Renieri, Carlo
An experimental trial of the segregation of white vs. pigmented and black vs. brown colours in alpacas was conducted at the Peruvian INIA Quimsachata Experimental Station. One hundred and forty five offspring were born from the following matings: 4 white sires × 36 white dams, 4 white sires × 39 pigmented dams, and 9 pigmented sires × 70 pigmented dams. Among these last matings were, 4 black sires × 25 black dams, 2 black sires × 20 brown dams, and 3 brown sires × 25 brown dams. Statistical tests validate that the inheritance of white is due to a single gene which is dominant over pigmentation, without any modifying effect and independent of segregation of black and brown patterns. However, the evidence does not support a simple dominant inheritance of the black vs. brown.
Suri/Huacaya phenotype inheritance in alpaca (Vicugna pacos)
(2012-01) Renieri, Carlo; Valbonesi, Alessandro; Antonini, M.; La Manna, Vincenzo; Huanca Mamani, Teodosio; Apaza, Nolberto; Presciuttini, Silvano; Asparrin, M.
The Suri/Huacaya phenotype inheritance in alpaca was tested on two independent Peruvian sources of records: the Registry of Mallkini farm (588 offspring by Suri sire x Suri dam from 62 paternal half sib families, and 2,126 offspring by Huacaya sire x Huacaya dam from 177 paternal half sib families) and the results of the Quimsachata INIA ILLPA Puno experimental trial (two reciprocal experimental test-crosses, involving a total of 17 unrelated males and 149 unrelated females). The data support a genetic model in which two linked loci must simultaneously be homozygous for recessive alleles in order to produce the Huacaya phenotype. The estimated recombination rate between these loci was 0.099 (95% C.L. = 0.029-0.204). The birth of 3 Suri offspring from Huacaya x Huacaya mating is explained by a new dominant mutation on some germinal lines of Huacaya animals. The direct mutation rate can be estimated at 0.0014.