The processing significance of variations in wool characteristics within and between Romcross fleece: A dissertation submitted in partial fulfilment of the requirements for the degree of Bachelor of Agricultural Science (Honours) in the University of Canterbury

Abstract

Wool samples were obtained from five mixed age Romcross breeding ewes. Four body regions were sampled; midside, neck, britch and back. Fleece characteristics measured were; average fibre diameter, yield, loose wool bulk, medullation, scoured colour, and fibre length after carding. Staple strength was measured in both tender (Min) and sound (Max) regions. Variation in characteristics within sheep within regions, between sheep within regions, and within sheep between regions was investigated. All characteristics varied significantly between sheep, and all except medullation showed significant regional variation. Correlation between measured characteristics and Hauteur were low and not significant. Linear regression equations were used to predict Hauteur from raw wool characteristics. An equation relating bulk, fibre diameter, break level and staple length to Hauteur 0 gave the best prediction, with an r² of 37.5%, and a standard error of 5.62. In all cases, the addition of staple strength to the equation decreased the accuracy of prediction.