While mature ewe nutrition targets are well established, producers have had less guidance for maidens.
A new analysis using the Australian Farm Optimiser (AFO) has shed light on this challenge, using updated reproduction equations based on real-world data from maiden ewes across multiple sites. The findings show that maiden reproduction responds differently to nutrition than previously assumed — particularly to liveweight change during joining.
What’s New?
The updated model reveals that:
- Maiden ewes perform best when maintaining weight during joining — not losing it.
- Optimal joining weight remains close to 96–98% of standard reference weight (SRW).
- Gains above SRW quickly become inefficient, offering little return on extra feed.
Why It Matters
Producers following these updated nutrition targets can expect:
- 10% higher weaning rates
- $4.90 more income per ewe (a 2.1% lift)
- A 0.5% increase in whole-farm profit
The Bigger Picture
Feed costs had little effect on the optimal targets, meaning it’s usually better to adjust stocking rate or supplement amount rather than compromising nutrition. The analysis also supports the use of maiden-specific reproduction coefficients in farm system models like AFO, helping improve future decision tools and benchmarking.
Take-Home Message
Maiden ewes aren’t just “small adults” — they need tailored nutrition. Maintaining condition through joining, rather than letting weight slip, pays off through stronger reproduction and better flock profitability.
🌱 This research was funded by MLA PDS and the trial was undertaked by NextGenAgri.