Resumen Se evaluaron la producción y la calidad de la lana en 139 ovejas de raza Milchschaf, del tambo ovino del Campo Experimental Nº 1 (Migues) de Facultad de Veterinaria. Los animales fueron esquilados en el preparto en el mes de julio de 2009, se registró el peso del vellón y se extrajeron muestras de lana de la zona del costillar para evaluar las características de medición objetiva y subjetiva. En 61 animales se extrajo además una muestra del cuarto para comparar la calidad de la lana y contenido de fibras meduladas con la muestra extraída del costillar. El peso del vellón fue de 3,3±0,7kg, el rendimiento 79,7±4,3%, el peso vellón limpio 2,6±0,6kg y el diámetro promedio 36,0±2,8µm. Las borregas 2 dientes tuvieron menores pesos de vellón, largo de mecha y diámetro promedio que las adultas (P˂0,01). Hubo diferencias entre costillar y cuarto en casi todas las características analizadas (P<0,01). La lana de cuarto presentó mayor diámetro (37,5±3,1µm), fue más áspera, con mayor grado de entrecruzamiento y menor definición del rizo. El contenido de fibras meduladas en 10g de lana lavada de la zona de cuarto fue significativamente mayor (P<0,01) que el registrado en costillar (18,3±62,0 y 4,2±20,8, respectivamente). Se constató una mayor proporción de fibras MED (96%) que de fibras Kemp y variaciones entre zonas del tipo de médula. Se concluye que el diámetro promedio correspondió al rango de lanas gruesas y que a la apreciación subjetiva las mechas presentaron características acordes al mismo. Se constató una alta variabilidad entre animales en el contenido de fibras meduladas.

Summary Production and wool quality in 139 dairy Milchschaf ewes from the Experimental Farm No. 1 of the Veterinary Faculty were evaluated. Animals were shorn prepartum in July 2009, greasy fleece weight was recorded and samples from mid side area were extracted to assess wool objective and subjective characteristics. A sample from hindquarter was also extracted on 61 ewes to compare the quality of wool and medullated fibre content with midside sample. Greasy Fleece weight was 3.3 ± 0.7 kg, yield 79.7 ± 4.3%, clean fleece weight 2.6 ± 0.6 kg and mean diameter 36.0 ± 2.8 μm. Hogget ewes had lower fleece weights, staple length and mean diameter than adults (P<0.01). There were differences between mid side and hindquarter samples in almost all characteristics analyzed (P<0.01). Wool from hindquarter showed higher wool diameter (37.5 ± 3.1μm), was harsher, with a higher degree of staple entanglement and lower crimp definition. Medullated fibre content per 10g of clean wool from hindquarter area was significantly higher (P<0.01) than that recorded in mid side (18.3 ± 62.0 and 20.8 ± 4.2, respectively). A higher proportion of MED fibres (96%) than K was found and variations in medulla type between areas. It was concluded that mean diameter corresponded to the range of coarse wool and the subjective assessment showed characteristics consistent with it. High variability between animal in medullated fibre content was found.

As an essential component in the demonstration of an atypical, q-deformed, statistical mechanical structure in the dynamics of the Feigenbaum attractor we expose, at a previously unknown level of detail, the features of the dynamics of trajectories that either evolve towards the Feigenbaum attractor or are captured by its matching repellor. Amongst these features are the following: i) The set of preimages of the attractor and of the repellor are embedded (dense) into each other. ii) The preimage layout is obtained as the limiting form of the rank structure of the fractal boundaries between attractor and repellor positions for the family of supercycle attractors. iii) The joint set of preimages for each case form an infinite number of families of well-defined phase-space gaps in the attractor or in the repellor. iv) The gaps in each of these families can be ordered with decreasing width in accord to power laws and are seen to appear sequentially in the dynamics generated by uniform distributions of initial conditions. v) The power law with log-periodic modulation associated to the rate of approach of trajectories towards the attractor (and to the repellor) is explained in terms of the progression of gap formation. vi) The relationship between the law of rate of convergence to the attractor and the inexhaustible hierarchy feature of the preimage structure is elucidated. We discuss the function of these properties in the atypical thermodynamic framework existing at the period-doubling transition to chaos.