High-performance forage crop and perennial pasture systems were put to the test in NSW’s Monaro region in an MLA-funded Producer Demonstration Site (PDS) to see how finishing lambs stacked up compared to the traditional store lamb system.

The result was a tick for farm profitability, with average net profits from establishing and finishing lambs on the pasture/crops ranging from $305/ha to $1,492/ha over the two years of the PDS, despite poor seasonal conditions in the second year.

In comparison, the region’s traditional system of turning lambs off as stores by the end of December, at an average sale weight of 29kg had an average total enterprise gross margin of $161/ha.

This PDS was run by Monaro Farming Systems producer group, with technical support from consultant Doug Alcock.

It followed an earlier project by Doug and the group, where they used GrassGro modelling software to quantify the benefits of finishing lambs. It reflects changing enterprises in the region, which is traditionally a Merino grazing area.

“In the last decade, as wool prices waned in relation to sheepmeat prices, there’s been a lot of opportunistic joining to terminal sires or Border Leicesters,” Doug said.

“The vast majority of those animals end up in the store market, unfinished.”

Monaro Farming Systems chairman John Murdoch said the group invested in GrassGro modelling to quantify the relative profitability of retaining these store lambs and finishing them on specialised, high quality pastures.

“The modelling showed that in nine out of 10 years you’re going to be significantly better off, economically, by finishing lambs on specialised pastures,” John said.

The PDS was aimed at giving producers confidence these modelled figures could be replicated in real-life.

Real-world test

The PDS involved 10 paddocks on host properties with pastures and crops in the original modelling:

• lucerne/phalaris/cocksfoot
• lucerne
• perennial ryegrass/white clover
• Hummer fescue/white clover/sub-clover
• white clover/lucerne/chicory/plantain
• Winfred forage brassica
• Pallaton Raphno forage brassica
• Leafmore forage brassica
• plantain/chicory
• chicory/plantain/white clover.

All paddocks were grazed with weaned crossbred lambs, with 50 in each mob eID tagged as a monitor group for weighing.

Takeaway messages for producers from the PDS include:

• The highest levels of production per hectare were achieved on systems where the crop was used solely for grazing lambs.
• Significant supplementary feeding resulted in good lamb growth rates, as well as very high rates of pasture utilisation. (The performance of lambs on finishing crops with and without supplementary feeding will be the subject of another MFS PDS this summer.)
• Allocating land to specialised lamb finishing can double or even triple its profitability, more than compensating any minor reduction in carrying capacity for breeding stock.

“As the PDS wasn’t conducted under strict pasture trial conditions, the systems cannot be directly compared to each other,” Doug said.

• Before selecting a forage pasture, consider the site, soil type, soil fertility status and long-term plan for the paddock.
• Good agronomic advice and good paddock preparation is critical.
• Aim for high dry matter production at high digestibility at the critical time of year – summer.
• Use the specialised pasture for finishing, don’t be tempted to use it for other purposes in the meantime.
• Using eID tags allows lamb weight to be easily measured more frequently to monitor growth and address problems quickly.