The OFDA2000 measurement is based on sub-samples drawn from a mid-side or hip-bone sample site. Are both sample methods adequate and accurate?
IWG recommends users should choose the mid-side as a sample site when wool preparation is their primary reason for using OFDA2000 or if the test results will be used in more complex decision systems, such as Estimated Breeding Values. This is because the mid-side of the sheep has a very high correlation to the whole fleece. When using the OFDA2000 ranking animals, the hip-bone site is readily identifiable and repeatable, which makes it the preferred option for many users. The hip-bone site on a sheep is generally the strongest part of the fleece and the user must take this into consideration.
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