Quick answer: Pick your silage storage by feedout rate, not by tonnage. You need to move roughly 6 inches off the face per day in cold weather and 10–12 inches per day in summer, or the face heats and you lose more in shrink than you gained by chopping. That single number rules out big faces on small herds. Below roughly 100–150 tons a year, baleage is almost always the right answer. From there up to a few hundred tons, a silage bag sized down (8–9 ft, or smaller) keeps the face moving. Drive-over piles and bunkers need scale — producers who have tried report piles under about 300 tons pack badly and spoil. Storage losses run roughly 8–12% for bags and baleage versus 15–20% for a covered bunker.
Most silage storage advice starts with cost per ton of structure. That is the wrong first question. A concrete bunker with a great cost-per-ton figure will still lose you money if your herd cannot eat across its face fast enough, and a "cheap" drive-over pile can be the most expensive feed on the farm if it never packs properly.
This guide compares silage bags, bunkers, drive-over piles, and baleage as storage systems chosen by herd scale and feedout rate. If you want the definitions — what separates baleage from haylage from chopped silage in the first place — start with baleage vs haylage vs silage, then come back here to decide how to store it.
The constraint is feedout rate, not tonnage
Once you open a silo, oxygen starts moving into the exposed face. Yeasts and molds wake up, the face heats, and dry matter burns off as CO2 and water. The only defense is speed: remove silage faster than air can penetrate.
Extension guidance across several universities converges on the same numbers — a minimum of about 6 inches per day in cold weather and 10–12 inches per day in warm weather off the exposed face (University of Kentucky and Michigan State University forage extension). Some sources push the summer figure toward 12 inches for corn silage specifically, because it is more prone to aerobic instability than haylage.
That number is what determines your storage system. Work it backwards: your daily as-fed silage demand divided by the tons-per-foot of the storage face has to clear 6 inches minimum, and comfortably clear 10–12 inches if you feed through summer. A small herd cannot satisfy that against a wide face, no matter how well the silage was made.
One producer weighing chopped silage against hay for a micro dairy landed on exactly this point:
"Not every feed option works for every operation... Storage efficiency of silage depends on volume and pile volume vs. surface area exposed, I think you'd find any production efficiency gained from feed type (vs. your other options of hay + grain) is gone through storage loss on a small herd."
— NDCat99 · AgTalk thread 1192353
Why small piles and bunkers fail
Piles and bunkers depend on packing density. The target for corn silage is roughly 14–18 lb of dry matter per cubic foot. You get there with heavy packing tractors, thin layers, and enough tonnage arriving to justify a dedicated packing machine.
A small pile fails on all three counts: layers go on too thick relative to packing time, the pile is too shallow for tractor weight to do much, and the surface-to-volume ratio is terrible. Producers who have run the experiment are blunt about the threshold:
"A silage pile anything less then 300 ton just doesn't work good and you would have to chop it up fine to get it to pack."
— 260david437 · AgTalk thread 1121620
"Small volume you need to bag."
— Rowcropcattleman · AgTalk thread 1121620
There is a food-safety edge to this as well. Poorly packed, poorly sealed, high-pH forage — especially anything with soil contamination — is where Listeria risk lives, and it is a genuine hazard in sheep and cattle. "Make it small and rough and it'll be fine" is not a plan.
If you are set on a pile at modest scale, the workable compromise is to narrow it deliberately: concrete blocks or Jersey barriers as sidewalls with backfill for stability, producing a tall, narrow face you can actually eat through. Same tonnage, much smaller exposed area.
The four systems compared
| System | Typical DM loss | Practical minimum scale | Capital to start | Face flexibility |
|---|---|---|---|---|
| Baleage (individually wrapped or in-line) | ~8–12% (range 4–15%) | None — works at any scale | Baler + wrapper | Excellent — one bale at a time |
| Silage bag | ~8–12% (as low as 5%) | Scales down to 5–8 ft bags | Bagger, often used | Good — bag diameter sets the face |
| Bunker silo (covered, well packed) | ~15–20% | Several hundred tons+ | Concrete walls, packing tractor | Poor — face is fixed and wide |
| Drive-over pile | ~15–20%+, worse if under-packed | ~300 tons and up | Lowest — plastic and tires | Poor — wide, sloped face |
| Upright / tower silo | ~8–12% | Suits small herds well | High to build, cheap used | Good — narrow face |
Loss figures are drawn from Cornell's Preventing Silage Storage Losses and USDA-ARS and provincial extension summaries. Treat them as well-managed benchmarks — a poorly sealed bunker or a torn bag can lose far more.
The pattern in that table is the whole argument: the systems with the smallest exposed face have the lowest losses and the lowest minimum scale. A bunker's cost-per-ton advantage only appears at volume, and it is partly an illusion because you are paying it back in shrink.
Sizing a silage bag to your herd
Bags are the most scalable option because you choose the diameter. Published capacities for common sizes:
| Bag diameter | Corn silage (tons/ft) | Haylage (tons/ft) |
|---|---|---|
| 8 ft | ~1.01 | ~0.80 |
| 9 ft | ~1.27 | ~1.00 |
| 10 ft | ~1.57 | ~1.24 |
Capacity scales roughly with the square of the diameter, which is why dropping from a 10 ft to an 8 ft bag cuts tons-per-foot by about a third — and correspondingly speeds up your inches-per-day.
Worked example. Twenty milking cows eating about 50 lb of corn silage as-fed per day need 1,000 lb — half a ton — daily. On an 8 ft bag at 1.01 tons/ft, that is roughly 6 inches per day. Right at the cold-weather minimum, and about half the summer target.
That is exactly what producers report from the field:
"I feed 20 out of an 8ft bag. It is a challenge when it warms up but a good innoculant will help a lot. I use a buchneri innoculant... If you could get a 6 or 5 you'd be golden!"
— Mac46147 · AgTalk thread 1192353
The math and the barn agree: 6 inches a day is survivable in freezing weather and marginal once it warms. His fix — Lactobacillus buchneri inoculant — is the right one. Buchneri produces acetic acid, which suppresses the yeasts that drive face heating, and it is the standard recommendation when feedout rate is slower than you would like. More on product selection in our baleage and silage inoculant guide.
Others running similar herds keep a 9 ft bag fresh by spreading demand across multiple crops — corn silage, haylage and triticale each in their own bag — while feeding milking cows, dry cows and bred heifers off them. That works because every animal on the place is pulling from the bags.
Entry cost is the other reason bags suit small operations. Used ag-baggers are simple machines and turn up regularly in the low five figures, with producers citing figures around $5,000 for older units. Compared with pouring bunker walls, that is a rounding error.
Baleage: the small-operation answer
For herds where even a small bag face moves too slowly, wrapped bales solve the feedout problem completely — because the "face" is one bale, opened the day you feed it.
This is consistently the advice small producers get from people who have been there:
"You don't have enough animals to do anything but baleage to keep ahead of silage out of anything other than a small tower silo at any time other than the cold of winter."
— TP from Central PA · AgTalk thread 1192353
"As others stated baleage is the best option. Honestly I would sell the chopping equipment and buy a nice round baler & Wrapper. I have a smaller skid steer and it handles baleage fine and you can store it pretty much anywhere and not worry about it spoiling. Baleage around here at least is 4'x4' and manageable with smaller equipment."
— k350024v · AgTalk thread 1192353
Baleage brings four advantages that matter disproportionately at small scale:
- No minimum scale. Ten bales is a viable "silo." Three hundred tons is not a prerequisite.
- Weather flexibility. A short drying window stops being a crisis. If it will not make dry hay, wrap it wet — see wrapping wet hay.
- Siting flexibility. Bales store on any firm, well-drained ground near where you feed. No structure, no apron, no runoff pad.
- Bale size scales to your loader. 4×4 bales are handleable with a skid steer; you do not need a big wheel loader to feed.
Size the bales to your feedout too. As one producer put it, a 30–40% moisture bale needs to be gone in five to seven days once opened, even in freezing temperatures. If a 4×5 bale is more than a few days of feed for your group, make smaller bales rather than accepting spoilage. Practical detail on all of this is in the first-time baleage guide and how to feed baleage.
One thing worth being clear about: baleage still needs a properly formed bale underneath the plastic. Dense, uniform, well-netted bales wrap tighter, hold their shape under stacking, and have fewer voids for oxygen. That is why net wrap and wrap film work together rather than competing — covered in net wrap under plastic film.
Decision guide by scale
| Operation | Best fit | Why |
|---|---|---|
| Under ~30 head / under ~150 tons | Baleage | Any silo face moves too slowly; one-bale feedout eliminates the problem |
| ~30–75 head | Small bag (8–9 ft) or baleage | Achievable inches/day; low entry cost; use buchneri inoculant |
| ~75–150 head | Bag (9–10 ft), or narrow walled pile | Face rate comfortable; bag flexibility still wins on shrink |
| 150+ head, multiple crops | Bunker or drive-over pile | Packing and face rate both achievable; lowest cost per ton stored |
| Small herd with an existing tower | Upright silo | Narrow face, low loss — the original small-herd answer |
| Any scale, wet-weather backup | Baleage alongside | Rescues cuttings that will not dry down |
These are starting points, not rules. Labor, existing equipment, land layout and how many separate forages you feed all shift the line.
What shrink actually costs
Run the number for your own operation before choosing a structure. The formula is simple:
Extra shrink cost = tons of dry matter stored × (loss rate A − loss rate B) × your feed value per ton of DM
Take 500 tons as-fed corn silage at 35% dry matter — 175 tons of DM. Storing it in a bunker at 17% loss versus a bag at 9% loss is a difference of 8 percentage points, or 14 tons of dry matter. Multiply by whatever a ton of corn silage dry matter is worth to you and you have the annual penalty. For most operations it lands in four figures — comparable to a meaningful share of a used bagger, every single year.
The point is not that bunkers are bad. At real scale a bunker is the right tool, and a well-managed one beats a badly managed bag. The point is that shrink is a real, recurring cost that belongs in the comparison alongside concrete.
Management basics that apply to every system
- Harvest at the right moisture. Too wet and you get seepage and clostridial fermentation; too dry and you cannot exclude air. This matters more than the structure you put it in.
- Seal immediately. Cover the day you finish filling, not the following week. Oxygen-barrier film measurably reduces surface spoilage over standard black-and-white plastic.
- Weight the cover thoroughly. Tires touching sidewall-to-sidewall, or gravel bags. Gaps are where spoilage starts.
- Manage the face. Shave it down cleanly, do not gouge it with the bucket, and do not leave loose silage piled at the base overnight. On a pile, roll the plastic back onto a pipe as you feed and re-secure it when you are done.
- Walk the bags weekly. Patch holes on sight. Birds, cats and varmints undo good work fast.
- Use inoculant when feedout is slow. L. buchneri for aerobic stability where the face moves under 10–12 inches a day in warm weather.
Where net wrap fits
Whichever system you choose, if any part of your forage program runs through a round baler — baleage, dry hay carryover, or cornstalks — bale quality determines storage outcome. Bales that hold density and shape stack better, shed water better, and wrap tighter. Our XES Extreme Bale Net Wrap ships factory-direct with free shipping across the continental US, in standard widths that fit John Deere, Vermeer, New Holland, Case IH, Krone, Kuhn and Massey Ferguson balers. If you are weighing wrapped bales against dry hay in the first place, dry hay vs baleage runs the comparison, and hay shed cost and payback covers the dry-storage side of the same shrink question.
Frequently asked questions
How fast do I need to feed off a silage face?
Aim for at least 6 inches per day in cold weather and 10–12 inches per day in warm weather. Below that, oxygen penetrates faster than you remove silage, the face heats, and dry matter losses climb sharply. Corn silage generally needs the faster rate because it is less aerobically stable than haylage.
How small is too small for a silage pile?
Producers with hands-on experience put the practical floor around 300 tons. Below that, layers cannot be packed adequately, the surface-to-volume ratio is poor, and spoilage typically exceeds any efficiency gained from chopping. Bag it or bale it instead.
What size silage bag should a small herd use?
Size the bag so your herd removes 6 inches minimum, ideally 10–12 inches, per day. As a benchmark, an 8 ft bag holds roughly 1.01 tons of corn silage per foot, so 20 cows eating 50 lb as-fed each move about 6 inches a day. If your herd is smaller than that, step down to a 5–6 ft bag or switch to baleage.
Which loses less dry matter, a bag or a bunker?
Bags. Well-managed silage bags typically lose about 8–12% of dry matter, and can get as low as 5%, while covered, well-packed bunkers commonly run 15–20%. The difference comes from the smaller exposed face and the sealed, single-use plastic.
Is baleage cheaper than chopping and bagging?
At small scale, usually yes — because you avoid the chopper, the bagger and the packing tractor, and you likely already own a round baler. Per-ton plastic cost is higher for baleage, but on modest tonnage that rarely outweighs the equipment savings and the flexibility of feeding one bale at a time.
Can I feed baleage and chopped silage from the same operation?
Yes, and many farms do. Baleage is often used as the wet-weather safety valve for cuttings that will not dry down, alongside a bag or bunker for the main crop. Transition animals between forages gradually and keep an eye on total ration dry matter, since the two differ in moisture.
The bottom line
Choose silage storage by how fast your animals can eat across a face, not by the tonnage you hope to put up. Six inches a day in winter and 10–12 in summer is the test every option has to pass. Small herds fail that test against bunkers and piles, which is why baleage and small-diameter bags dominate at that scale — and why bags and baleage also carry roughly half the dry matter loss of a covered bunker. Scale up and the bunker's cost per ton eventually wins, but only once you have the animals to keep the face moving and the equipment to pack it properly.
Forum quotes are reproduced with attribution and linked to their source threads; follow the links to read the originals. Loss and capacity figures are published benchmarks for well-managed storage — your results will vary with moisture, packing, sealing and weather. Consult your local extension forage specialist or nutritionist before changing storage systems.
Featured photo: Silage Clamp, Hilltop Farm by Mark Anderson, licensed under CC BY-SA 2.0, via Wikimedia Commons.
