Single-Auger or Twin-Auger Feed Mixer Wagon – Which One Should You Choose?

Single-auger or twin-auger feed mixer wagon? This is one of the most important questions to answer before purchasing a machine for preparing TMR. Both designs can chop and mix feed effectively, but they differ in capacity, overall length, output per mixing cycle and the amount of space and tractor power they require.

A twin-auger feed mixer wagon is not automatically better than a single-auger machine. On a farm with narrow passages or limited manoeuvring space, a shorter single-auger model may be far more practical. On the other hand, farms preparing large quantities of TMR may benefit from the ability to mix the entire ration in a single cycle using a twin-auger wagon.

This guide explains the differences between the two designs and the conditions you should check before making your decision.

Start by Calculating the Required Feed Mixer Wagon Capacity

The choice between one and two augers should begin with determining how much TMR will be prepared in a single mixing cycle. The total number of animals is important, but it is not the only factor.

You should also consider:

• the number of feeding groups,
• the number of different rations prepared each day,
• feeding frequency,
• the composition and volume of the ration,
• planned herd expansion.

You can make an initial calculation using the ZAMET feed mixer wagon calculator. The result will help you estimate the required capacity and narrow the choice down to a single-auger or twin-auger design.

If you would like to understand the relationship between herd size and mixer capacity in more detail, read our guide on how to choose the right feed mixer wagon capacity for the number of cows.

How Does a Single-Auger Feed Mixer Wagon Work?

A single-auger feed mixer wagon uses one vertical auger to chop and mix the ingredients. Knives mounted on the auger cut the material, while the specially designed auger flight moves the feed around the mixing tub.

This design is relatively short and compact. It is therefore easier to operate in narrow passages, small farmyards and buildings where manoeuvring space is limited.

A single-auger feed mixer wagon is worth considering when:

• small or medium-sized batches of TMR are prepared,
• the farm has limited manoeuvring space,
• feed passages are narrow,
• barn entrances have restricted dimensions,
• the available tractor has limited power,
• separate rations are prepared for several smaller feeding groups.

The ZAMET FIDER-i MAXI single-auger feed mixer wagon is available in capacities ranging from 7 to 12 m³.

How Does a Twin-Auger Feed Mixer Wagon Work?

A twin-auger feed mixer wagon uses two vertical augers. This design makes it possible to prepare a larger batch of TMR in a single cycle, which is why it is mainly used on larger farms and in intensive livestock production.

Greater capacity usually means a longer machine. Before choosing a twin-auger model, it is therefore essential to check whether the wagon will fit inside the buildings and whether there is enough space for safe manoeuvring.

A twin-auger feed mixer wagon is worth considering when:

• a large quantity of TMR is prepared in one cycle,
• the farm has large feeding groups,
• reducing the number of daily loading cycles is a priority,
• a tractor with suitable specifications is available,
• the farmyard and buildings provide sufficient space,
• the herd is expected to grow.

The ZAMET FIDER-i 2S MAXI twin-auger feed mixer wagon is available in capacities ranging from 14 to 20 m³.

Single-Auger vs Twin-Auger Feed Mixer Wagon – Key Differences

Selection criterion	Single-auger feed mixer wagon	Twin-auger feed mixer wagon
Batch size	Small or medium	Large
Overall machine length	Shorter	Longer
Manoeuvrability	Easier in restricted spaces	Requires more manoeuvring space
Number of augers	One	Two
Typical farm size	Small and medium-sized farms	Larger farms
Number of mixing cycles	Suitable for smaller batches or several feeding groups	Allows a larger ration to be prepared in one cycle
Tractor requirements	Depend on capacity and equipment	Usually higher due to the size of the machine

This table presents general differences. The final choice should always be based on the specifications of the particular model and the conditions on the farm.

Does a Twin-Auger Feed Mixer Wagon Mix Better?

The number of augers alone does not determine the quality of the prepared TMR. Mixing uniformity also depends on:

• the design and condition of the augers,
• the position and sharpness of the knives,
• the loading order of the ingredients,
• the amount of feed inside the mixing tub,
• mixing time,
• the structure and moisture content of the material.

A correctly sized single-auger feed mixer wagon can produce a highly uniform TMR. A twin-auger design, however, allows a larger volume of material to be processed efficiently.

It is therefore not advisable to select a twin-auger machine solely because two augers appear to guarantee better mixing. The size of the batch and the operating conditions are more important than the number of augers alone.

Check Whether the Machine Will Fit on the Farm

The capacity and number of augers must be compatible with the existing infrastructure. A longer twin-auger wagon may require considerably more turning space than a single-auger model.

Before ordering the machine, measure:

• the height and width of every entrance,
• the narrowest point of the feeding passage,
• the lowest structural beams and installations,
• the available turning area,
• passages between buildings,
• the loading area,
• the working and loading height of the loader.

The entire route taken by the machine must be checked, not just the main barn entrance. Problems may only become apparent when turning near a column, passing through a narrow section or positioning the mixer wagon alongside the feed table.

On farms with older or low buildings, a shorter single-auger feed mixer wagon may be the more practical choice. Where sufficient space is available, a twin-auger machine can prepare a larger ration in one mixing cycle.

Match the Feed Mixer Wagon to the Tractor

A larger feed mixer wagon means more loaded material and higher demands on the tractor. Before purchasing, compare the specifications of the selected model with the tractor that will operate the machine every day.

Check:

• the required tractor power,
• PTO speed,
• the required number of hydraulic connections,
• hitch type,
• the weight of the fully loaded machine,
• operating conditions on slopes and soft ground.

It is not enough to determine whether the tractor can pull an empty wagon across a level yard. The complete combination must be able to start, turn and stop safely when fully loaded. The tractor must also provide sufficient power for stable operation of the mixing system.

The Number of Feeding Groups Can Change the Decision

A large herd does not always require the largest available feed mixer wagon. If the animals are divided into several groups receiving different rations, the TMR will be prepared in separate cycles.

Separate rations may be prepared for:

• cows at different stages of lactation,
• dry cows,
• heifers,
• calves,
• beef cattle.

In this situation, the size of the largest feeding group may be more important than the total number of animals on the farm.

However, preparing many smaller batches increases working time, the number of loading operations and fuel consumption. It is therefore worth comparing two options: a larger feed mixer wagon completing fewer cycles or a smaller machine preparing several separate batches.

Consider the Composition and Structure of the TMR

Feed mixer wagon capacity is expressed in cubic metres, while feeding rations are often planned in kilograms. A machine should therefore not be selected solely on the basis of the total weight of the ration.

Two TMR batches of the same weight may occupy very different volumes. The actual volume is affected by:

• the proportion of maize silage and grass silage,
• the amount of hay or straw,
• the length and moisture content of the material,
• the proportion of concentrates,
• the order in which ingredients are loaded.

A dry, fibrous ration may require more space than a heavier and more compact mixture. The tub should not be overfilled because the material needs enough room to move freely and mix evenly.

A farm using a bulky ration may therefore require a larger feed mixer wagon than another farm with the same number of animals.

Consider Future Herd Expansion

A feed mixer wagon is normally purchased for many years of operation. Realistic plans for the future development of the farm should therefore be included in the selection process.

If the herd is expected to grow in the near future, a machine that is sufficient today may quickly become too small. This does not mean that the largest available model should always be selected.

An oversized wagon may be difficult to use with the farm’s current small batches. It may also exceed the capabilities of the tractor or fail to fit inside existing buildings.

Before deciding, consider:

• the planned number of animals,
• the expected date of herd expansion,
• possible barn modernisation,
• the future division of animals into feeding groups,
• whether a more powerful tractor will be available.

The capacity reserve should be based on realistic development plans rather than an undefined possibility of future expansion.

Select the Correct Feed Discharge System

The method of distributing the prepared TMR is just as important as the mixing process. The discharge opening, chute or conveyor should allow feed to be distributed evenly in the actual conditions of the farm.

Before selecting the equipment, determine:

• on which side the feed must be discharged,
• whether discharge is required on one or both sides,
• how close the wagon can travel to the feed table,
• whether there are columns or other obstructions,
• the width of the feeding passage,
• whether a conveyor is required to extend the discharge reach.

Optional equipment should solve a specific operational problem. Depending on the farm, useful options may include an additional discharge opening, longitudinal or cross conveyor, hydraulically controlled counter knives, a magnet on the discharge arm or wider tyres.

Common Mistakes When Choosing the Number of Augers

One of the most common mistakes is choosing a feed mixer wagon solely on the basis of the number of cows. This ignores the structure of the ration, the feeding groups and the actual conditions inside the farm buildings.

Other common mistakes include:

• ordering a larger machine without measuring the access routes,
• failing to consider the turning radius,
• selecting a wagon that is not compatible with the tractor,
• choosing capacity only for current requirements without considering realistic herd development,
• purchasing a very large wagon for small TMR batches,
• overlooking the position and reach of the feed discharge system,
• focusing exclusively on the purchase price.

The answer to the question “one auger or two?” should result from analysing the complete feeding process, not simply comparing the sizes of the mixing tubs.

How to Choose a Feed Mixer Wagon Step by Step

A practical selection process should follow these steps:

1. Determine the number of animals in each feeding group.
2. Establish the size of the largest batch prepared in one cycle.
3. Calculate the approximate feed mixer wagon capacity.
4. Check the composition and actual volume of the TMR.
5. Measure the buildings, access routes and turning areas.
6. Compare the machine requirements with the tractor specifications.
7. Decide whether one or two augers are required.
8. Select the feed discharge arrangement and optional equipment.
9. Consult the proposed configuration with the manufacturer.

Following this sequence helps you select a machine that is not only large enough but also practical and safe in everyday operation.

Single-Auger or Twin-Auger Feed Mixer Wagon – Summary

A single-auger feed mixer wagon is a good choice when smaller batches of TMR are prepared and manoeuvrability is important. Its shorter construction makes it particularly suitable for farms with limited space.

A twin-auger feed mixer wagon is better suited to larger batches and farms where reducing the number of mixing cycles is a priority. However, the tractor, buildings and manoeuvring areas must be able to accommodate the larger machine.

The final decision should consider the required capacity, feeding groups, TMR composition, building dimensions, tractor specifications and planned development of the farm.

You can complete the first step yourself. Use the ZAMET feed mixer wagon calculator to estimate the required capacity. You can then consult the result with the ZAMET team to select the most suitable construction and equipment for your farm.

Select the right feed mixer wagon for your herd

The entire daily TMR ration in one batch.

1. Select the herd type

Dairy cows Beef cattle Mixed herd

2. Enter the number of animals

Number of dairy cows

Calculate

Calculate and select a feed mixer wagon

Frequently Asked Questions

Is a twin-auger feed mixer wagon only suitable for large farms?

Twin-auger mixer wagons are most commonly used on farms that prepare large batches of TMR. However, the decision should be based on the feeding system, group sizes and available space rather than solely on the total number of animals.

Can a single-auger feed mixer wagon process complete bales?

The ability and speed of processing complete bales depend on the auger design, the number and type of knives, the counter knives and the type of material. The equipment of the specific model should be checked before purchasing.

Which feed mixer wagon is easier to manoeuvre?

A shorter single-auger feed mixer wagon is generally easier to manoeuvre. Actual manoeuvrability also depends on the overall length of the tractor and wagon combination, axle position and farm layout.

Does a twin-auger wagon require a more powerful tractor?

Twin-auger wagons are usually larger and carry more material, so they generally require more tractor power. The exact power requirement should always be checked in the technical specifications of the selected capacity.

Does the calculator also determine the required number of augers?

The calculator primarily helps estimate the required feed mixer wagon capacity. The number of augers should then be selected according to the calculated capacity, available farm space, tractor specifications and feeding organisation.

Can I purchase a larger wagon to allow for herd expansion?

Yes, but the capacity reserve should be realistic. The machine must also work correctly with the batches currently being prepared, fit inside the buildings and remain compatible with the available tractor.