EVALUACIÓN DE UN MÉTODO NUMÉRICO DE MEDICIÓN DEL DIÁMETRO DE LA FIBRA DE ALPACA

Translated title of the contribution: Evaluation of a numeric method foralpaca fibre diameter measurement

G. Haydeé González, R. Carlos León Velarde, A. Raúl Rosadio, V. Wilber García, Cesar Miguel Gavidia Chucan

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

This study presents the statistical evaluation of a digital image alpaca fibre diameter measurement method, Digital Image Fibre Diameter Analysis (DIFDA). This method developed in the International Potato Center (CIP) requires an evaluation of the fibre sample digital image process, prepared in slides covers and taked from a scanner of negatives and films. DIFDA presents two options for fibre diameter measurement process: Digital image complete and sections of the digital image. The results of the fibre sample are mean fibre diameter, standard deviation and coefficient of variability. The objective was to test and compare the mean fibre diameter values obtained by DIFDA with the values from two conventionals methods: Projection Microscope and OFDA (Optical Fibre Diameter Analysis). In adition, DIFDA's process options were evaluated. Two hundred six alpaca fibre samples from Pacomarca Farm, Puno, were evaluated. The mean fibre diameter samples values, measured by commercials methods, Projection Microscope and OFDA, were, 21.64 ± 3.58 and 21.74 ± 4.0, respectively. The mean fibre diameter reported for DIFDA was 21.74 ± 3.03. No statistical differences between the methods were detected. The Pearson's correlation coefficient for DIFDA and Projection Microscope and for DIFDA and OFDA was 0.87 and 0.84, respectively. The process of DIFDA could be done in the complete digital image option, or using three or more sections for the dimention of 1000 x 1000 pixels, or five or more sections for the dimention of 500 x 500 pixels. The conclutions were that the DIFDA's results showed no statistical significative differences between neither the Projection Microscope's nor the OFDA's results. Consequently, this measurement method would be used satisfactorily in breeding programs that requires continuos fibre measurement.

Translated title of the contributionEvaluation of a numeric method foralpaca fibre diameter measurement
Original languageSpanish
Pages (from-to)1-8
Number of pages8
JournalRevista de Investigaciones Veterinarias del Peru
Volume19
Issue number1
StatePublished - 2008
Externally publishedYes

Bibliographical note

Funding Information:
La medición del diámetro con OFDA se realizó en el Laboratorio de Control de Calidad de la empresa Inca Tops S.A., Arequipa; la medición mediante Lanámetro se hizo en el Laboratorio de Fibras del Centro de Investigaciones IVITA, Maranganí, de la Universidad Nacional Mayor de San Mar-cos; y la medición mediante el Algoritmo Matemático (DIFDA) se hizo en la División de Recursos Naturales del Centro Interna-cional de la Papa, Lima, Perú.

Funding Information:
Los autores agradecen al Proyecto ALTAGRO, coordinado por la División de Sistemas de Producción y Ambiente del Centro Internacional de la Papa, por el apoyo técnico y económico en el desarrollo de este estudio. Especial agradecimiento a la empresa SALLALLI APX, la cual proporcionó las muestras de fibra de alpaca y sus respecti-vas mediciones por el método OFDA; y al Laboratorio de Fibras del Instituto Veterina-rio de Investigaciones Tropicales y de Altura (IVITA), Maranganí (FMV-UNMSM), por las facilidades brindadas en las mediciones con el Lanámetro.

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