The sale will consist of 7500 crossbred lambs from the Tasmanian properties of Weymouth at Pipers River, Effingham at Low Head and Greenhythe Pastoral at Hillwood.

The large consignment of second-cross lambs is expected to attract interest from four States.

Elders' Greg Harris said buyers had already begun to inquire about the offering, with the lambs developing a loyal group of return bidders each year.

"The lambs are all in excellent condition," he said. "We've had a great season down here; it's only just starting to dry up now."

Stewart Archer, who runs Weymouth Pastoral, said this year's sale would be a special one.

He was one of the original vendors to initiate the annual event and was looking forward to marking 10 years of success.

"I would like to thank buyers for their support over the years," he said.

Participants now include Mr Archer's nephew Winston Archer and cousin Ed Archer.

"It's a family affair," he said.

The idea to hold the on-property sale a decade ago came when Mr Archer sold lambs at prime and store sales across the State.

"When you took into account the cost of the crops, there didn't seem to be much difference," he said.

"I thought it would be a good idea to hold a sale on-farm, and it's been the best idea ever."

The region surrounding Pipers River does not lend itself to finishing lambs so now Mr Archer's entire drop is offered at 3.5-month-old off their mothers.

"It has been great for ease of management," he said.

Weymouth Pastoral runs 2000 Border Leicester-Merino ewes, which are sourced from sales at Bendigo and in South Australia.

"I look for clean faced ewes with soft hair and noses," he said.

The sheep are then joined to White Suffolk rams, which Mr Archer said produced a hardy second-cross lamb. This year the operation produced 2850 lambs from the 2020 ewes mated.

"The ewes are run on improved pastures," he said.

"I don't believe in buying in grain or supplementary-feeding; they need to do it themselves."