Crimp frequency (CF) is a greasy wool trait of interest to ram breeders, commercial wool growers and wool processors alike. Early studies of CF effects on processing performance were reviewed by Hunter (1980) and are confirmed by more recent work. In general, low CF wools tend to process more efficiently than higher CF wools of similar mean fibre diameter (MFD) and staple length (SL). For example, low CF wools tend to be more efficient in topmaking (i.e. longer Hauteur and lower Romaine), and can be spun with fewer ends down and produce more even yarns (e.g. Kurdo et al., 1986a, b ; Stevens and Crowe, 1994 ; Swan et al., 1995 ; Lamb et al., 1996 ; Lamb, 2000). CF also affects fabric properties such as thickness, drape, felting and pilling propensity, but the most appropriate CF depends on the characteristics desired of the fabric and the system (worsted or woollen) on which it is produced (e.g. Hunter et al., 1982 ; Stevens and Mahar, 1995 ; Wuliji et al., 1995). Despite this, or perhaps because of these varying fabric properties, wool buyers and processors appear to have preferences for either high or low CF wools. That is, the economic value of CF may be positive or negative depending upon the buyer or processor. 

J. L Smith, I. W Purvis, Andrew A Swan

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 2002. Session 12, , 12.06, 2002
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