The Macquarie Sire Evaluation site is currently located at the Trangie Agricultural Research Centre (TARC), which is located 7 kilometres north west of Trangie in Central West NSW. The pasture is dominated by native perennial grasses and herbage, with introduced annual species and lucerne. The main soil types are red brown earths and grey cracking clays. TARC is located in a non-seasonal rainfall region.
The ewe base involved in the 2015 drop at the Trangie site are currently sourced from the NSW DPI commercial flock at TARC, based on Centre Plus and Roseville Park bloodlines. The ewe base joined for the 2017 and 2018 MLP drops are Centre Plus and Towalba ewes with contrasting skin and wrinkle traits.