Gotland lambs are all individually evaluated - we do an objective check of their body conformation, weight and wool quality according to a standardized protocol.
To link the phenotype we see to wool micron count - we send wool samples from each lamb for OFDA analysis.
For more information - here is a good read for anyone raising fiber animals.
http://www.ymccoll.com/AC_Update_Vol_6_issue_4_wool.pdf
