The Glanna Merino Stud was registered in 1984 following official inspection of Glanna Ewes. The Glanna flock was founded in 1934 by the late Jack Rayner (father of the present owner) with Mudgee fine wool ewes and rams of Dalkeith blood. From 1943 to 1984 rams of Bocoble blood were used along with a small number of Merryville rams. Since 1984 eleven Merryville Stud Rams have been added to the stud including the record priced Merryville ram at the 1989 Goulburn Ram Sale for $34,000. The latest purchase has been a Superfine Merryville ram bought for $20,000 at the 2000 Mudgee Ram Show and Sale.

The Glanna Stud is owned by Ron Rayner, his wife Dianne and their children Jeff and Kim. The Stud is situated at "Glanna" on the Ulan Road only 5 km north east of Gulgong NSW. Gulgong is in the north western portion of the Central Tablelands in a 26" rainfall area.

Glanna now has 1,800 stud ewes mated in 2008 (Horned and Poll) and all have been naturally mated in single sire mobs.