A Total Mixed Ration feed wagon is an agricultural machine that blends forage, grain, protein supplements, minerals, and water into a uniform feed for livestock. It matters because dairy and beef animals perform best when every bite has the intended balance of nutrients. A well-mixed ration supports milk production, growth, rumen health, and efficient use of feed.
The wagon also reduces labor by combining weighing, mixing, transporting, and unloading into one machine.
Key Facts
- Total ration mass = mass of forage + mass of grain + mass of supplement + mass of water
- Ingredient percentage = ingredient mass / total ration mass x 100%
- Dry matter mass = as-fed mass x dry matter fraction
- Mixing time depends on wagon size, auger speed, ingredient order, and forage length.
- Overmixing can reduce effective fiber length and increase the risk of digestive problems.
- Power requirement increases when the load is heavier, denser, wetter, or harder to cut and lift.
Vocabulary
- Total Mixed Ration
- A Total Mixed Ration is a complete livestock feed mixture designed so each mouthful contains the same balance of forage, grain, protein, minerals, and additives.
- Dry Matter
- Dry matter is the portion of feed left after all water is removed, and it is used to compare feeds with different moisture contents.
- Auger
- An auger is a rotating screw-shaped mixing component that lifts, cuts, folds, and moves feed ingredients inside the wagon.
- Load Cell
- A load cell is a sensor that measures the weight of ingredients added to the wagon.
- Discharge Conveyor
- A discharge conveyor is the moving belt or chain system that carries the finished ration out of the wagon and into the feed bunk.
Common Mistakes to Avoid
- Ignoring moisture content, because as-fed weight does not equal nutrient weight when feeds have different water levels.
- Adding ingredients in a random order, because long forage, concentrates, liquids, and supplements mix more evenly when loaded in a planned sequence.
- Mixing for too long, because excessive auger action can shred fiber and reduce the physical structure animals need for healthy rumen function.
- Assuming a full wagon always mixes better, because overfilling can create dead zones where ingredients circulate poorly and the ration becomes uneven.
Practice Questions
- 1 A TMR recipe uses 1200 kg of corn silage, 500 kg of haylage, 250 kg of grain, and 50 kg of mineral mix. What is the total ration mass, and what percentage of the ration is grain?
- 2 A farm adds 1800 kg of feed that is 42% dry matter. How many kilograms of dry matter are in the load?
- 3 A herd begins sorting long hay pieces out of the ration after the farm changes the mixing time and loading order. Explain two machine or management changes that could make the ration more uniform without destroying too much fiber.