What is Spinning Fineness?

Spinning Fineness is expressed in microns and provides an estimate of the performance of the wool when it is spun into yarn.

Spinning Fineness is calculated from the measured Mean Fibre Diameter and the measured Coefficient of Variation of Diameter. The Spinning Fineness is the same as the Mean Fibre Diameter when the Coefficient of Variation is 24%. Wools with a CV of less than 24% will have Spinning Fineness less than the Mean Fibre Diameter.

Although Spinning Fineness is frequently provided, together with other objectively measured information, by ram breeders it is of little value in this context, and it was never intended to be used for evaluation of individual sheep.

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