Asociación fenotípica entre diámetro promedio y su variabilidad con otras características del vellón en Corriedale

2015 
espanolEl objetivo del ensayo fue determinar el diametro de la lana y su variabilidad, asi como su asociacion con otras caracteristicas del vellon de evaluacion subjetiva y objetiva en dos majadas Corriedale experimentales. Se utilizaron 871 borregos, 477 hembras y 394 machos. Se evaluaron caracteristicas de los vellones en forma subjetiva (caracter, toque, color, grosor de la mecha, entrecruzamiento y penetracion de tierra) y en la esquila se registro el peso de vellon sucio. Se determino diametro promedio y variabilidad (coeficiente de variacion y factor de confort), rendimiento al lavado, peso de vellon limpio y largo de mecha. Se efectuo un analisis de varianza, estudiandose los efectos fijos de estacion experimental, edad y sexo sobre las caracteristicas evaluadas, estimandose tambien las correlaciones entre las mismas. El diametro promedio y su variabilidad fueron afectados por el ano, sexo y estacion experimental. El diametro medio estuvo correlacionado positiva y significativamente con el toque y el grosor de la mecha (0,31 y 0,29, respectivamente). El coeficiente de variacion presento una correlacion media con el grosor y positiva y significativa con el resto de las caracteristicas apreciadas subjetivamente excepto con la penetracion de tierra. Las asociaciones fenotipicas encontradas sugieren una herramienta que podria ser posible utilizar para seleccionar animales que tengan mejores caracteristicas de diametro y calidad de lana. Por ello, seria importante la realizacion de estudios geneticos del diametro asi como de sus asociaciones con caracteristicas de la lana de evaluacion subjetiva y objetiva en esta raza EnglishThe objective of the essay was to determine wool fiber diameter, its variability and association with other fleece characteristics of subjective and objective evaluation in two experimental Corriedale flocks. A total of 871 hoggets were used, 477 females and 394 males. Prior to shearing, fleeces characteristics were subjectively evaluated (crimp definition, handle, color, staple thickness, staple formation and dust penetration). At shearing, greasy fleece weight was recorded and a wool sample from midside was extracted. Mean fire diameter and its variability (coefficient of variation and comfort factor), wool yield, clean fleece weight and staple length were determined. An analysis of variance was performed to study fixed effects of experimental station, year and sex on the evaluated characteristics; correlations between traits were estimated. Mean fiber diameter and its variability were affected by year, sex and experiment station. Mean fiber diameter was positively and significantly correlated with handle and staple thickness (0.31 and 0.29, respectively). The coefficient of variation of fiber diameter presented a moderate correlation with staple thickness and a positive and significant association with the rest of the characteristics subjectively appreciated except with dust penetration. The phenotypic associations found suggest a tool that could be possibly used to select animals with better characteristics of fiber diameter and wool quality. It would be important conducting genetic studies of fiber diameter and its associations with wool characteristics of subjective and objective evaluation in this breed
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