Walk any farm show and you’ll see the same thing. Guys standing around a vertical mixer, looking down into the tub, trying to figure out how that one big auger turns a round bale and a pile of silage into a ration cows actually eat. Fair question. A vertical feed mixer is simple on paper. Getting it right in the yard is where the money is.
The short answer
A vertical feed mixer is a tub with one or more upright, cone-shaped augers. The auger lifts feed up the middle and lets it fall back down the outside walls. Knives on the auger flighting cut long material as it rolls. Over a few minutes, everything you loaded gets cut, blended and turned into a total mixed ration, or TMR.
That’s it. No paddles, no reels. One motion, repeated.
What happens inside the tub
Picture the load as a slow tornado. The auger pulls material up, the tub walls push it back in, and gravity drops it to the floor again. Each pass, the knives take another bite out of long hay or straw.
Two things control how well that works:
- Knives. Sharp knives cut. Dull knives tear and smear, and you lose time.
- Restrictor plates or counter-knives. These hold material against the auger so it gets cut faster. Push them in to process, pull them out to blend gently.
Why vertical mixers took over so many yards
Here’s the no-fluff truth. Vertical mixers handle whole bales. Horizontal machines usually want chopped forage. If your ration leans on round or square bales, a vertical saves you a separate processing step.
They also run with fewer moving parts down low. Fewer chains. Fewer bearings sitting in wet feed. That shows up in your parts bill.
The trade-off? Vertical tubs are tall, so loader height matters. And mixing very small amounts in a big tub isn’t ideal. Size it right and that problem mostly goes away.
Single, twin or more augers
More augers means more volume in the same footprint and a faster mix on bigger loads. A twin auger machine like our VT series is a common middle ground for herds that outgrew a single auger but don’t need a giant truck-mount.
Getting a good mix every load
- Load dry hay and long forage first, give it time to cut.
- Add concentrates and minerals in the middle of the load, not dumped on top at the end.
- Add wet ingredients and liquids last.
- Mix only as long as the ration needs. Overmixing shortens particle length and costs fuel.
Bottom line? The machine does the same thing every time. Your loading habits decide whether the cows get the same ration every time.
A walk through one load
Let’s run a real load so it’s not all theory. Say you’re feeding a mixed dairy ration: a round bale of hay, some straw, corn silage, haylage, a grain mix and a mineral pack.
The tub is empty. You start the auger at the right PTO speed, then drop the hay bale in. Restrictors go in. For the next few minutes the knives work that bale down while it rolls up the center and falls back down the walls. You’re watching for long stems to disappear and the bale to lose its shape.
Straw goes in next, same idea. Once the long stuff looks right, you pull the restrictors back a bit. Then the grain and the mineral go in, into the rolling mass, not dumped in one corner. Haylage and silage follow. Last, if the ration calls for it, water or a liquid.
A few more minutes after the last ingredient and you open the door. The feed should come out looking the same at the start of the bunk as at the end. If it doesn’t, something in that sequence needs fixing.
What vertical mixers don’t like
They’re tough machines, but they have habits you need to respect.
- Tiny loads in a big tub. The auger can’t build the rolling motion, so the mix suffers.
- Overfilling. No room at the top to roll means a poor mix and spilled feed.
- Net wrap and twine. It wraps the auger and ends up in the rumen. Get every bit off.
- Rough starts with a full tub. Engaging the PTO hard on a full load shocks the gearbox. Ease into it.
- Stones and tramp metal. Hard on knives, flighting and the gearbox.
Questions to ask before you buy one
Before you sign for a vertical, sit down with the dealer and ask:
- What’s the realistic working volume for my ration, not just the rated volume?
- What horsepower does it need when processing bales?
- How easy is a knife change, and what do knives cost?
- What scale system comes on it?
- Where are parts stocked, and how fast can I get them?
Good answers to those five tell you more than any spec sheet.
Vertical mixers on small farms and big ones
The same basic machine works across a huge range of operations. A 60 cow family dairy and a 3,000 head feedlot can both run verticals. What changes is the size, the number of augers, and how the mixer fits into the daily routine.
On a small farm, the mixer often replaces a lot of hand work and guessing. One person loads, mixes and feeds in a single run. On a big operation, the mixer is one link in a chain that includes loaders, feed pads, commodity sheds and several people. There, minutes per load really add up.
Common myths
“Longer mixing is better.” It isn’t. Past a point you’re just grinding forage shorter and burning diesel.
“Any bale goes in as is.” Net wrap and twine must come off. Every time.
“The scale is close enough.” Small errors repeated every load cost real money over a year.
“Bigger is always safer.” A tub that’s too big for your loads mixes worse and needs a bigger tractor.
How to tell your mixer is doing its job
- The bunk looks the same from start to finish.
- Cows aren’t digging for grain or leaving piles of long stems.
- Particle separator results stay steady week to week.
- Mix times are consistent for the same ration.
- Milk, gain or condition scores are steady.
If any of those slip, look at knives, load order, load size and scale accuracy first. Nine times out of ten the fix is in there.
The short version
I’ve spent my career around these machines. The ones that perform best aren’t always the newest. They’re the ones on farms where somebody cares about load order, keeps knives sharp and checks the scale. Get the machine right, then get the habits right. The cows do the rest.
Where to go next
If you’re weighing up your first vertical or replacing a tired one, look at the full LEO product range and talk to a dealer who’ll still be answering the phone when an auger bearing goes at 5 a.m. That matters more than any brochure.
