Tectra - education & training in New Zealand's Wool Industry

In the shed

Classing with the aid of in-shed testing


This article looks into fleece measurement classing.

The increasing use of new technology to measure the fibre diameter of individual fleeces before or during shearing has created an expectation among wool growers that classing their clip using individual fleece measurements to make up lines of wool will give the same average micron as the Pre sale core test certificate results for each line.

Merino growers are learning this is not the case. It is important that classers and growers understand the reasons why this happens. Some of the reasons are:

  • biases in sampling individual fleeces;
  • biases in selecting fleeces for class lines;
  • biases arising from calculation procedures; and
  • biases arising from sample preparation.

Interested and want to know more? Please download the attached PDF

Created: 09 May 2007, Modified: 09 May 2007