There has been increasing interest from commercial sheep producers to shift to shedding breeds such as the Dorper and Wiltshire Horn, which has triggered the development of shedding composite lines. This study analysed the genetic expression of spring shedding in adult ewes using a singlestep animal model, from which potential marker effects could be identified. Early investigations into the genetic architecture of shedding support previous literature which suggests that the trait is highly heritable and controlled by a dominant gene effect. However, further research of major SNP effects within this population and the multi-breed population within the Sheep Genetics LAMBPLAN is required.