The study aimed to evaluate the precision and accuracy of equipment that determine the quality of sheep fibres. The equipment used (total = 15) were Sirolan Laserscan, OFDA 2000, Minifiber EC and Fiber EC, belonging to nine laboratories in Peru (n=7) and Argentina (n=2). The mean values of the mean diameter fibre (MDF) were determined in relation to the tolerance limits given by IWTO 12 and IWTO 47, using samples of fibres with known diameters. The accuracy was determined from the average obtained from the subsamples minus the actual value of the samples and the precision was evaluated by the standard deviation of the repetitions. Dunnett's multiple comparisons method was used for precision and accuracy. The results showed that the equipment coded as B and C in laboratories 4 and 8 were the most accurate, while equipment B and D in laboratories 5 and 8 shoed the highest precision. Six of...

The study aimed to evaluate the precision and accuracy of equipment that determine the quality of sheep fibres. The equipment used (total = 15) were Sirolan Laserscan, OFDA 2000, Minifiber EC and Fiber EC, belonging to nine laboratories in Peru (n=7) and Argentina (n=2). The mean values of the mean diameter fibre (MDF) were determined in relation to the tolerance limits given by IWTO 12 and IWTO 47, using samples of fibres with known diameters. The accuracy was determined from the average obtained from the subsamples minus the actual value of the samples and the precision was evaluated by the standard deviation of the repetitions. Dunnett's multiple comparisons method was used for precision and accuracy. The results showed that the equipment coded as B and C in laboratories 4 and 8 were the most accurate, while equipment B and D in laboratories 5 and 8 shoed the highest precision. Six of...

El presente estudio de investigación tuvo como objetivo evaluar la precisión y exactitud de equipos de laboratorios que determinan la calidad de fibras de tops de ovinos, se evaluaron un total de 14 equipos (Sirolan Laserscan, OFDA 2000, Minifiber Ec y Fiber Ec), pertenecientes a 7 laboratorios de Perú y 2 de Argentina (Bariloche). La identificación de los laboratorios se mantuvo en reserva mediante un acuerdo de confidencialidad suscrito por los responsables de cada uno de ellos. Para la evaluación se utilizaron 4 muestras de fibras de ovino con diámetros conocidos pertenecientes a muestras comerciales del laboratorio del INTA – Bariloche, las mismas que fueron preparas en frascos de polietileno y enviadas a cada laboratorio. La determinación de la media del diámetro de fibra (MDF) se realizó bajo condiciones de trabajo de cada laboratorio, mediante las normas IWTO 12 y 47. L...

The objective of this research was to construct and to evaluate a portable fiber tester (PFT) for field test use. The standard wool top (SWT) samples were used for evaluation measurement of fiber diameter using PFT comparatively in three laboratories without restricted temperature or humidity controls. Linear model with three factors was used to derive the least square means and variance components were also determined. In addition, precision and accuracy were determined. The PFT is constructed to be compact and lightweight. It works using digital image technology and can evaluate the fiber diameter for each sample in 45 seconds. The results show that the average fiber diameter measured by PFT at all labs are within IWTO defined tolerance values with a high precision. There were no significant lab effect whereas, variance of labs remained low. It can be concluded that PFT is an instrumen...

El objetivo de esta investigación fue construir un equipo medidor de fibra portátil para uso en el campo; para ello se realizaron diferentes pruebas de medición de muestras de lana de ovino, realizándose para ello pruebas interlaboratorios sobre la precisión del equipo.