Genetic analysis of six production traits in Peruvian alpacas

Gutiérrez, Juan Pablo; Burgos, A.; Cervantes, I.

doi:10.1016/j.livsci.2008.11.006

Cited by 34 publications

(30 citation statements)

References 13 publications

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“…Details about PACOMARCA experimental ranch can be found in a study by Gutiérrez et al (2009). The two alpaca ecotypes, Suri (SU) and Huacaya (HU), were analysed independently.…”

Section: Datamentioning

confidence: 99%

“…All the alpacas were scored numerically by the same classifier, as a distance from that considered as the best performance for each trait, on a scale from poor (1) to excellent (5). Some of these traits were already analysed by Gutiérrez et al (2009), and all of them were used to estimate genetic parameters by Cervantes et al (2010), but they have been reanalysed under the same model with the updated data set for both SU and HU ecotypes to improve the accuracy of the estimations of the genetic parameters, and Reference weights To simplify, only two sets of relative subjective weights will be considered for analysis in this study, those inspired by the ICAR suggestions with only FD and CV as traits of concern (ICAR, 2012), considered with identical importance, and those defined by PACOMARCA. However, the involved theory can be extended to any other set of weights and it should be easily extensible to any other population or specie under different genetic parameters provided they are known.…”

Section: Datamentioning

confidence: 99%

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Weighting fibre and morphological traits in a genetic index for an alpaca breeding programme

Gutiérrez

Cervantes

Pérez-Cabal

et al. 2014

Animal

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Nowadays, the fibre diameter (FD) is considered the main selection objective in alpaca populations all over the world. International Committee for Animal Recording recommendations define the FD and its CV as the first two traits to be considered in breeding programmes for this specie. In addition to these main criteria, other selection criteria of economic value used are comfort factor (CF) or standard deviation (s.d.); also other less important traits being used as selection objectives are these morphological traits: density (DE), crimp (CR) or lock structure (LS) for, respectively, Huacaya (HU) and Suri (SU) ecotypes, head (HE), coverage (CO) and balance (BA). The goal of this study was to establish how to implement a combined selection index starting from genetic parameters and to study the expected correlation between genetic trends by considering different alternative procedures of weighting all the involved traits, and the consequences of a wrongly proceeding way. Heritabilities and genetic and phenotypic correlations were estimated from the data set belonging to the PACOMARCA experimental farm for SU and HU. Two approaches were used to check the consequences of a set of subjective weights essayed. The coefficients of selection indexes were obtained for two sets of reference weights. In addition, equivalent weights were drawn if applied those reference values as coefficients of hypothetical selection indexes directly on phenotypes; relative expected genetic responses were computed in different cases. Results showed that almost in all cases for both ecotypes, the weight applied to CF should be surprisingly negative. Concerning genetic responses, only CO was compromised in some cases for the HU ecotype. The essayed methodology allowed explaining the differences between ecotypes in the genetic trends. The proposed methodology was shown to be effective to study the relative importance of the traits granted by the manager of a breeding scheme.

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“…Details about PACOMARCA experimental ranch can be found in a study by Gutiérrez et al (2009). The two alpaca ecotypes, Suri (SU) and Huacaya (HU), were analysed independently.…”

Section: Datamentioning

confidence: 99%

Section: Datamentioning

confidence: 99%

Weighting fibre and morphological traits in a genetic index for an alpaca breeding programme

Gutiérrez

Cervantes

Pérez-Cabal

et al. 2014

Animal

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“…Mean fibre diameter (FD) was computed from washed samples after minicored and 2 mm snippets using an Optical Fibre Diameter Analyser (OFDA 100). CF is defined as the percentage of fibre with less than 30 m. Some of these traits were already analysed (Gutiérrez et al, 2009) but they have been reanalysed in the context of scoring traits including the higher number of records. Therefore, all results presented here take into consideration the new dataset.…”

Section: Datamentioning

confidence: 99%

“…Around 95% of the Peruvian camelid population is located in the Andes and managed under a traditional extensive systems characterized by low productive and reproductive parameters (Ministry of Agriculture, Peru, 2004). Recently, some genetic improvement programs for alpaca fibre production have been implemented in the Peruvian Altiplano, namely those run by Pacomarca S.A. (Gutiérrez et al, 2009). The Pacomarca recording organisation is based on an experimental ranch applying state-of-art technology including objective measurement of fibre quality such as fibre diameter and its coefficient of variation.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, we have estimated the genetic parameters that affect fibre diameter and its variability in Peruvian alpacas (Gutiérrez et al, 2009). The aim of this research was to estimate genetic parameters associated with type traits and their genetic relationships with objective fibre traits while inspecting the differences in genetic parameters between breeds.…”

Section: Introductionmentioning

confidence: 99%

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Genetic parameters and relationships between fibre and type traits in two breeds of Peruvian alpacas

Cervantes

Pérez-Cabal

Morante³

et al. 2010

Small Ruminant Research

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a b s t r a c tFour fibre traits (fibre diameter, FD; coefficient of variation of FD, comfort factor; and standard deviation of FD) were jointly analysed with six subjectively scored type traits (fleece density, crimp, lock structure, head, coverage, and balance) in two breeds of Peruvian Altiplano alpaca (Suri, SU; and Huacayo, HU) to ascertain their genetic relationship. A total of 2405 fibre records and 2194 type scores were available for the HU breed whereas these figures were 709 for fibre records and 650 for type scores for the SU breed. Estimated heritabilities for fibre traits were moderate to high, ranging from 0.565 to 0.699 in the SU breed and from 0.255 to 0.417 in the HU breed. Genetic and permanent environmental correlations between fibre related traits were extremely similar across breeds suggesting that these traits are fairly the same. Heritabilities estimated for the type traits tended to be lower than those estimated for the fibre traits particularly in the SU breed (ranging from 0.173 to 0.272). Fibre and type traits were, in general, genetically poorly correlated except for crimp in the HU breed, which had favourable correlations, from moderate to high, for fibre traits. In Altiplano areas in which fibre performance recording could not be implemented, crimp scoring makes it feasible to carry out mass selection in the Huacayo breed and furthermore include rural communities in national or regional selection programmes.

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Colorimetry analysis of coat color and its relationship with fiber traits in alpacas

Cruz

Yucra

Gutiérrez

et al. 2021

Animal

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Genetic analysis of six production traits in Peruvian alpacas

Cited by 34 publications

References 13 publications

Weighting fibre and morphological traits in a genetic index for an alpaca breeding programme

Weighting fibre and morphological traits in a genetic index for an alpaca breeding programme

Genetic parameters and relationships between fibre and type traits in two breeds of Peruvian alpacas

Colorimetry analysis of coat color and its relationship with fiber traits in alpacas

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