Cubic metres on a spec sheet tell you how big the bowl is. They do not tell you how many cows you can feed, how many batches you will run per day, or whether the machine will still be earning its keep three seasons from now. That gap between volume and practical headcount is where buyers get into trouble.
The 7008 VT sits in the middle of the VT Series, which runs from 6 to 21 cubic metres. Eight cubic metres is enough machine for a serious commercial dairy or a mid-sized beef feedlot, but only if you work the numbers properly before signing anything.
From Cubic Metres to Cow Numbers
Ration density is the variable most buyers skip. A lush summer silage ration can sit below 130 kg per cubic metre. A winter mix heavy with dry lucerne, oat straw, and ground maize can push past 200 kg per cubic metre. The same 8 m³ bowl behaves very differently depending on what goes into it.
For a typical South African dairy ration — high-moisture silage making up the bulk of the forage, with some concentrate and hay — plan on a working density somewhere between 140 and 170 kg per cubic metre. At 80% utilisation, which is a practical working target rather than an optimistic one, the 7008 VT delivers a usable batch of roughly 900 to 1,100 kg of mixed feed per load.
Dairy cows in mid-lactation eating a full TMR typically consume between 22 and 28 kg of mixed ration per day. Work through the arithmetic. A single 1,000 kg batch covers 36 to 45 cows at one feeding. Two batches per day, which is the norm on most Free State dairies, puts you comfortably in the range of 70 to 90 cows from one machine, assuming you are not splitting groups further than that.
Beef feedlot rations run heavier. Closeout diets with high grain inclusion and minimal forage sit around 200 kg per cubic metre or above. That same 8 m³ bowl, at the same 80% utilisation, might only yield 1,280 kg per batch because the material is so dense. But finishing cattle eat more dry matter than dairy cows, often 10 to 12 kg per head per day on a high-energy diet. One batch per day feeds 100 to 120 head at that intake level. Add a second batch and you are looking after 200 animals or more from a single machine.
What Changes When Forage Dry Matter Swings
This is where a lot of operators get caught short between July and September. Late-winter feed inventories in KwaZulu-Natal and Mpumalanga often shift toward drier material: older silage with higher dry matter, baled grass hay, straw as a filler. Dry matter can move from 30% to 45% or higher without anyone making a formal ration change.
When that happens, the ration gets less dense by volume even though the cows need the same energy intake. You are packing fewer kilograms into each cubic metre, which means each batch feeds fewer animals. Where you were running two batches comfortably, you might find yourself needing two and a half, and there is no such thing as half a batch.
Early spring is the other pressure point. Fresh-cut pasture and young silage crop both land at high moisture. The ration gets heavier and wetter. Now the bowl fills up faster by weight, which sounds like an advantage but it means your mixing time per kilogram of dry matter actually increases because wet, dense material works the auger harder. If you want to understand what that does to your tractor at the PTO, the power demands on the 7008 VT across different ration types are worth working through before the spring flush hits.
Seasonal dry matter swings of 10 to 15 percentage points are routine on South African operations. Size your batch assumptions around the worst case, not the average. If you cannot close your peak-load window at current herd size with two batches, you either need to rethink the ration sequence or look at the next machine up.
The Herd-Growth Buffer
Nobody buys a mixer for exactly today’s herd. The useful question is how much growth the 7008 VT absorbs before it becomes the bottleneck.
At two batches per day on a standard dairy ration, the headroom sits between 70 and 90 cows. Add a third batch and that ceiling rises to around 130 to 135 cows, though that assumes short loading and discharge windows and a tractor that does not need a break. Three batches is achievable. Four is a management problem waiting to happen.
A practical planning approach: if your herd is currently 60 cows and you expect to be at 90 within two seasons, the 7008 VT carries you there without modification. If you are planning to push through 100 and beyond, the next model up in the VT Series is worth pricing now. The cost of upsizing a specification before you order is a fraction of what it costs to run an undersized machine for eighteen months and then trade it.
That 10 to 20% headroom above current peak demand is not a luxury. It is the margin that covers the day your normal operator is sick and the relief man takes longer per batch, or the day a round bale lands wetter than expected and takes an extra five minutes to break down. LEO Agriculture’s analysis of what undersizing actually costs puts numbers to what most producers already feel intuitively.
Accuracy Across Multiple Batches
Running two or three batches a day for different cow groups creates a real risk of ration drift. The first batch of the morning is usually accurate. By the third batch, if the operator is loading by memory or estimating wet weights on dry ingredients, the deviation can be significant.
On-board weighing that logs every batch and flags deviation in real time is what keeps the ration consistent across a full day’s work. The way ISOBUS integration handles that across multiple groups per day is covered in detail in this explanation of how the technology works in practice. It matters more the more batches you run.
Numbers to Work With
- 8 m³ working volume at 80% utilisation: roughly 6.4 m³ (226 ft³) usable per batch
- Dairy ration density (silage-based): 140 to 170 kg/m³, giving 900 to 1,090 kg per batch
- Beef finishing ration density (high grain): 190 to 210 kg/m³, giving 1,220 to 1,340 kg per batch
- Dairy cow daily intake at mid-lactation: 22 to 28 kg fresh weight per head
- Beef feedlot daily intake on finishing diet: 10 to 12 kg dry matter per head
- Two batches per day, dairy: 70 to 90 cows covered
- Two batches per day, beef feedlot: 200 to 220 head at standard finishing intakes
None of these figures account for a herd with unusually high forage inclusion, specialist breed diets, or operations pushing three separate cow groups with different ration specs. Those situations need the numbers run against your own records rather than an industry average. But as a starting point for a buying conversation, they put a real floor and ceiling on what the 7008 VT will do before anyone has to guess from volume alone.
