It’s that time of the year, many people are making plans for grazing oats, a key strategy for driving weight gain through winter. But a common question remains: how much value does oats actually deliver, and when does that performance occur?
Author’s note: This article discusses weight gain outcomes from grazing oats crops, a very common strategy for driving weight gain in young cattle over the winter in NSW and Qld in Australia.
Nonetheless, I think the analysis and outcomes will be relevant to grazing all types of livestock on fodder crops in all parts of the world. I hope you find these insights interesting.
Over the past few years we have had a number of data queries about weight gain on oats, so we know the outcomes are not always guaranteed.
Sometimes it is the fact that reduced weight gain (or even actual weight loss) during transition can have more impact than expected. Other times it can be factors such as mob size, water quality, supplements, animal health and feed availability/quality, that can impact ongoing weight gains (even once the transition period is out of the way).
All this has had us thinking, and wondering: are the actual outcomes worth the cost???
We’re not going to go into a full-blown gross margin analysis on oats crops, that would make pretty boring reading! But what we can do is explore what insights are lurking around in the Optiweigh data.
So, we analysed all our data from the Condamine region in QLD.
We used this region because there are heaps of Optiweigh units there, and our team have had enough interactions with the owners of these units to be able to estimate that between 50 and 75% of the Optiweigh data is coming from cattle on oats crops during the period from April to August.
The data covers the years 2021 to 2026 and represents over 50,000 animals. This provides a practical, data-driven view of how cattle perform through the oats grazing period.
A Consistent Pattern: Transition Then Lift
The data shows a clear and consistent trend. Weight gains are typically lowest in April, before building through winter and peaking around August. This suggests cattle often go through a transition phase when first entering oats, followed by stronger performance once the crop is established and providing sufficient feed quantity and quality.
How Much Difference Do Oats Make?
Comparing early-year baseline performance (January to March) with winter performance (July to September), the data shows an average improvement of approximately 0.3 kg/day.
Over a typical 90-day grazing period, this equates to:
- Around 27 kg of additional liveweight per head; and
- Approximately $108 per head in value (assuming $4.00/kg liveweight).
This confirms that oats are not just maintaining growth, they are materially improving it.
Adjusting for Real-World Conditions
It is important to recognise that this dataset includes all cattle, not just those grazing oats.
In practice, only an estimated 50–75% of animals in the dataset are likely to have been on oats at any given time. When this is taken into account, the true performance uplift from oats is likely closer to 0.4 to 0.6 kg/day.
This translates to:
- 36–54 kg of additional liveweight over 90 days
- $144–$216 per head in value
This highlights the strong economic return that oats can deliver under the right conditions.
Season Still Drives Performance
While the overall pattern is consistent, the timing and magnitude of performance varies significantly between years. In some seasons, cattle appear to respond quickly and performance lifts early. In others, the response is delayed until later in winter or even spring. This reflects the importance of seasonal conditions such as rainfall, soil moisture, and crop establishment.
In the Condamine region, autumn and winter rainfall are less reliable than summer rainfall, which means the success and timing of oats performance is highly dependent on the season.
What This Means for Producers
The key takeaway is clear:
- Oats consistently deliver higher weight gains than baseline pasture;
- The benefit is significant, but not always immediate; and
- Timing of peak performance depends on seasonal conditions.
Understanding this pattern can help producers make better decisions around grazing timing, stocking rates, and expectations of performance.
The Optiweigh Advantage
One of the biggest challenges with grazing crops is knowing exactly when they start delivering value. The other problem comes at the end when the crop is running out and marketing decisions need to be made that crystalise the financial outcome.
Optiweigh removes the guesswork at both ends of the season by providing real-time, objective measurement of animal weight.
This allows producers to:
- see exactly when livestock begin responding to forage crops;
- ensure that weight gain targets are being met through the season;
- assess the value of supplementation programs;
- avoid other issues such as animal health from upsetting the outcome; and
- ensure that it doesn’t all come undone through poor planning of sales at the end.
In short, Optiweigh helps ensure you capture the full value of your forage system, not just assume it is working.