The costs that don’t appear on the contractor’s invoice but erode your silage ROI — site preparation, film, spoilage, handling, and the storage decisions that change the numbers.
The Invoice Is Only Half the Story
When dairy and beef farmers calculate the cost of their silage programme, they typically sum up two numbers: the contractor’s invoice (or their own equipment operating cost) and the film cost. These are the visible, quantifiable costs that appear in the farm accounts. What rarely appears in the cost analysis — but consistently appears in the actual financial outcome — is the cost of silage spoilage, storage infrastructure, and handling inefficiency.
Silage spoilage is the single largest hidden cost in most Australian farm silage programmes. A conservative estimate for round bale silage stored outdoors on bare ground without shade — the de facto standard on many properties — is 8 to 15% dry matter loss across the storage period from a combination of surface spoilage, base rot, UV film degradation leading to small punctures, and aerobic deterioration at feedout. On a 600-bale seasonal programme valued at AUD $120 per bale (AUD $72,000 total), an 8% average DM loss represents AUD $5,760 of silage that was made, wrapped, and then effectively discarded. A 15% loss represents AUD $10,800.
This article builds the full cost picture — not to discourage silage production, but to help farmers make better storage infrastructure decisions by understanding what those decisions are actually worth. Improving storage from ‘outdoor bare ground’ to ‘compacted gravel pad with shade’ typically costs AUD $2,000 to $6,000 in infrastructure and reduces DM losses by 4 to 8 percentage points — a return on investment measured in months on a 600-bale programme. For a technical overview of how silage is secured at the baling stage to set the storage programme up for success, our article on how dairy farmers use round balers to secure year-round silage supply covers the production side of the equation.
The Full Cost Stack: What Goes Into AUD Per Tonne DM Silage
| Cost Component | Typical Range (AUD) | Notes |
|---|---|---|
| Baling — contractor | $12–$20/bale | Bale-and-wrap combined |
| Baling — own equipment (amortised) | $6–$11/bale | Equipment + maintenance + fuel |
| Silage film (6 layers, 1.25m bale) | $8–$14/bale | 2025 wholesale prices |
| Silage inoculant | $1.50–$3.50/bale | Recommended; saves more than it costs |
| Storage site (amortised over 10 yrs) | $0.80–$2.50/bale | Gravel pad at $4,000–$12,000 total |
| Handling (loader time to storage) | $0.50–$1.80/bale | Tractor + loader operating cost |
| Spoilage loss (DM basis) | $6–$22/bale | 8–15% of bale value at $120/bale |
| Feedout handling | $0.40–$1.20/bale | Loader time from storage to feed |
| TOTAL per bale | $29–$75/bale | Wide range reflects storage quality |
| TOTAL per tonne DM | $120–$280/tonne DM | Good to poor storage outcomes |
The AUD $120 to $280 per tonne DM range is not a modelling artefact — it reflects the actual difference between an operation that invests in proper storage infrastructure, uses 6-layer film, applies inoculant, and stores on a gravel pad in shade (AUD $120 to $160/t DM), versus one that uses 4-layer film, stores on bare ground in direct sun, and loses 12 to 18% of silage DM to spoilage (AUD $200 to $280/t DM). The cheaper approach at the baling stage costs significantly more per unit of silage actually consumed.
Storage Infrastructure: What Actually Changes Your Numbers
The Ground Surface Decision — $4,000 That Pays Back in Year Two
Round bales stored on bare soil contact a moisture source continuously. The bottom 15 to 20 cm of a bale sitting on wet soil after autumn rain absorbs ground moisture through the film overlap at the bale end — the least film-covered part of the bale. This base moisture ingress initiates aerobic and clostridial spoilage in the bottom layer of the bale, working inward over the storage period. A bale stored on wet soil for 6 months can lose 15 to 25% of its base layer DM to this mechanism alone.
A compacted crushed rock or gravel pad — 10 to 15 cm depth of road base compacted with a roller or vibrating plate — eliminates base moisture ingress at a cost of AUD $3,500 to $8,000 for a pad storing 200 to 400 bales. At AUD $120 per bale value and 4% DM loss reduction, the annual saving from the pad is: 300 bales × $120 × 0.04 = $1,440 per season. Payback on the pad occurs within 3 to 5 seasons. Concrete is more durable but not meaningfully better for silage storage than well-constructed gravel — spend the premium on a larger pad, not on concrete.
The Shade Decision — Free on Many Properties, Valuable Everywhere
Direct sun exposure on standard green or black silage film raises bale surface temperature to 55 to 70°C on a 35°C day in central Queensland or SA. At these temperatures, UV film degradation accelerates by a factor of 3 to 5 relative to shaded storage — film that would last 18 months in shade may become brittle and crack within 8 to 10 months in direct sun. The cost of shade provision varies from zero (positioning the storage row on the south side of an existing shed or tree line) to AUD $3,000 to $8,000 for a simple shade cloth or open-sided corrugated iron structure. On properties where natural shade is available, using it costs nothing and extends film service life by 4 to 8 months.
Stacking Height — Where Savings Become Losses
Triple-stacking round bales (three layers high) during the active fermentation period (first 21 days post-wrapping) compresses the bottom-layer bales under the weight of the upper two layers, creating seal gaps at the film overlap zone at the bale ends. These gaps allow oxygen ingress precisely when the fermentation is most sensitive to aerobic disruption. Store all freshly wrapped bales in single or double layers for the first 21 days; triple-stack only after fermentation is complete, if ground space is constrained. The DM loss from premature triple-stacking typically exceeds the ground space saving by 3 to 5 times.
Film Quality: Where Not to Cut Costs
Four-layer film has approximately 33% less oxygen barrier performance than 6-layer film. In Australian conditions with UV intensity, temperature cycling, and wildlife puncture risk, the failure rate of 4-layer film over a 12-month storage period is 2 to 3 times the failure rate of 6-layer film. A single bale failure (aerobic spoilage of 30 to 50% of bale DM) costs AUD $35 to $60 in lost feed value — 7 to 12 times the film saving. Always use 6 layers minimum; 8 layers for bales stored more than 12 months or in high-UV environments.
Corvids (crows, ravens) and in some regions feral pigs investigate silage bales, pecking or rooting at the film surface for moisture. A single bird puncture that goes unrepaired for 7 days can produce a 20 to 40 cm diameter aerobic spoilage zone in the bale — at 400 g of silage DM per cm² of bale face, this represents 4 to 8 kg DM destroyed per unrepaired puncture. Inspect stored bales every 5 to 7 days and carry silage repair tape.
Silage stretch film stored in direct sun before use becomes pre-stressed — UV degradation begins on the roll surface, reducing the film’s post-application stretch memory and oxygen barrier performance. Store film rolls in a dark, dry location (shed or container) and rotate stock so older rolls are used first. Film stored correctly for up to 18 months from manufacture maintains full specification; film exposed to sun for 3 to 4 months before use may perform at 70 to 80% of rated barrier specification.
Many farmers describe 10 to 15% silage DM loss as ‘normal’. It is common — not normal. Well-managed silage programmes on gravel pads with shade, 6-layer film, prompt puncture repair, and correct stacking achieve 3 to 5% total DM loss across the storage and feedout period. The difference between ‘normal’ 12% loss and well-managed 4% loss on 600 bales at $120/bale is AUD $5,760 per season — returned entirely by storage management improvement with minimal additional capital.
The Wrapper — Where Production Cost Meets Storage Outcome
The wrapper is the link between the baling operation (which determines silage quality) and the storage period (which determines how much of that quality is preserved to feedout). A wrapper that applies 6 layers with consistent 50% overlap and no tail-end gaps sets the silage up for minimum storage losses. A wrapper that applies variable layer counts (because the operator is counting manually and losing count on a long day) and leaves thin-film zones at the bale end produces a proportion of under-wrapped bales that account for a disproportionate share of storage losses.
The 9YCM-850 bundling film wrapping machine applies wrapping revolutions from a programmable counter — eliminating the human counting error that produces under-wrapped bales. Across a 600-bale season, the difference between 100% of bales wrapped to specification versus 85% to specification (15% under-wrapped from counting errors) is, at a conservative 3% additional DM loss per under-wrapped bale: 600 × 0.15 × $120 × 0.03 = $324 in recovered feed value per season. The wrapper pays for itself in consistently applied film, not just in time saving.
Frequently Asked Questions
Discuss Your Silage Programme Economics
Tell us your annual bale volume, current storage setup, and typical spoilage rate — we’ll help identify where your programme is losing value and what changes make financial sense.
