Cattle Feed Bunk Design: Space and Height

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-08-14

Key Takeaways

• Bunk space is critical for herd dynamics and performance: Insufficient bunk space (e.g., <9-12 inches/head for feedlot steers, <18-24 inches/head for full-fed mature cows) exacerbates social hierarchy, leading to reduced feed intake for subordinate animals, uneven growth, and increased stress.
• Bunk height directly impacts feeding posture and efficiency: Bunk heights should be tailored to animal class, with 24-30 inches for mature cows, 18-24 inches for feedlot cattle, and 18-22 inches for calves, to allow a natural head and neck angle, preventing strain and feed wastage.
• Apron design and drainage are vital for hygiene and comfort: An 8-12 foot wide apron with a 1-2% slope away from the bunk is essential to manage moisture, prevent mud accumulation, and maintain a clean feeding surface, thereby reducing digestive upset and foot problems.
• Feed bunk material and construction influence durability and safety: Concrete offers longevity and stability, while metal and poly bunks provide portability; all designs must feature smooth surfaces and rounded edges to prevent oral injuries and entrapment.
• Bunk space requirements vary significantly by feeding strategy: Limit-fed animals require more space (24-30 inches/head for cows) than those on full feed (18-24 inches/head) due to simultaneous access demands, while creep-fed calves need minimal space (2-3 inches/head) due to their size and restricted access.

Getting feed bunk design right is one of the highest-leverage decisions you can make in a beef cattle operation. The bunk is where your animals convert feed into gain, and small errors in space or height can quietly cost you pounds of performance every single day. This guide covers the practical details of cattle feed bunk design: how much bunk space each animal needs, how tall the bunk should be, how to position it for drainage and access, and how to adjust your setup as cattle grow. It is written for beef cattle producers, farm managers, and anyone planning a new feeding facility or remodeling an existing one.

At a Glance

Before diving into the details, here are the most important numbers and principles to remember.

The biggest mistake producers make is building one bunk and expecting it to work for every class of cattle. Calves need lower bunks, mature cows need taller bunks, and feedlot cattle need different spacing than cow-calf pairs. Plan for the specific animals you are feeding today and the ones you will feed next year.

Why Bunk Space and Height Matter

Cattle are herd animals with a strong social hierarchy. When feed is delivered, dominant animals push their way to the bunk first. Subordinate animals wait, sometimes for a long time, before they can access feed. If there is not enough bunk space, the low-ranking animals get less feed, eat faster when they finally get access, and experience more stress. The result is uneven weight gain, more aggressive behavior, and a higher risk of digestive upset.

Bunk height matters for a different reason. Cattle have a natural feeding posture. They lower their heads to eat and then lift them to chew and swallow. If the bunk is too low, cattle have to spread their front legs and reach down, which puts strain on their neck and shoulders. If the bunk is too high, cattle cannot reach the feed comfortably and may push feed out of the bunk trying to get at it. Both situations waste feed and reduce intake.

There is also a cleanliness factor. A bunk set at the right height keeps feed inside the bunk where it belongs. Feed that gets pushed onto the ground mixes with manure and mud, and cattle will not eat contaminated feed. That wasted feed is money out of your pocket.

Finally, there is a safety factor. Bunks with sharp edges, unstable bases, or poor drainage create injury risks. Cattle can cut their mouths on damaged metal edges, trap feet in gaps between bunk sections, or slip on muddy aprons. Good design prevents these problems before they start.

Understanding Cattle Behavior at the Bunk

To design a bunk that works, you need to understand how cattle approach and use it. Cattle prefer to eat with their heads in a natural position, which means their muzzle is roughly level with their chest or slightly below. They do not like to stretch down or reach up for extended periods.

When cattle eat, they typically take a mouthful of feed, lift their heads, chew, and swallow. This rhythm means the bunk needs to hold feed in a way that allows this natural head movement. A bunk that is too deep forces cattle to reach further than comfortable. A bunk that is too shallow lets feed spill out as cattle root through it.

Cattle also have a strong preference for eating along a straight line. They do not like to eat from a curved bunk that puts them at odd angles to their neighbors. Straight bunks with clean sight lines reduce competition and let subordinate animals find a spot without confrontation.

Social dynamics change with group size. In small groups of 10 to 20 animals, the social order is stable and well understood by all members. In large groups of 100 or more, cattle may not know their exact rank relative to every other animal, which can increase aggressive interactions at the bunk. Larger groups generally need more bunk space per head, not less, to reduce competition.

Bunk Space Requirements by Class of Cattle

The amount of bunk space each animal needs depends on several factors: the class of cattle, the feeding system, the feed type, and how often you deliver feed. Here are the practical ranges for common situations.

Mature Cows on Limit Feeding

Limit-fed cows receive a restricted ration, often delivered once per day. Because all cows want access to feed at the same time, you need more bunk space per head. Provide 24 to 30 inches of bunk space per cow. This allows every animal to eat simultaneously without excessive competition.

If you feed a total mixed ration that is high in forage and cows are eating slowly, lean toward the higher end of this range. If you feed a more concentrated ration that cows consume quickly, you can use the lower end.

Mature Cows on Full Feed

Cows on a full feed program, where feed is available most of the day, need 18 to 24 inches of bunk space per head. Because feed is present for longer periods, not all cows need to eat at the same instant. They can rotate through the bunk throughout the day.

Growing Calves in Backgrounding

Backgrounding calves are growing from weaning weight to feedlot entry weight. These animals are learning to eat from a bunk and need adequate space to reduce stress. Provide 12 to 18 inches of bunk space per head. If you are starting newly weaned calves, use the higher end of this range during the first few weeks while they adapt.

Feedlot Cattle

Feedlot cattle are on high-energy rations and are typically fed twice per day. They eat quickly and efficiently. Provide 9 to 12 inches of bunk space per head. This is the most efficient use of bunk space in any cattle operation.

Some feedlots use 8 inches per head when feeding high-concentrate rations twice daily. This works only when the ration is consistent, the feed is delivered on a strict schedule, and the cattle are healthy and well adapted. For most operations, 9 to 12 inches is safer.

Creep-Fed Calves

Creep feeding provides supplemental feed to calves while they are still nursing. The calves need access to feed that their mothers cannot reach. Provide 2 to 3 inches of bunk space per calf. Because calves are smaller and can fit through smaller openings, you can use a creep feeder that restricts cow access.

Bulls

Mature bulls need 30 to 36 inches of bunk space per head. Bulls are larger, more aggressive at feeding, and need more room to eat comfortably. Never crowd bulls into standard cow bunk space.

Factors That Increase Space Needs

Several situations call for more bunk space than the standard recommendations:

• Newly received cattle. Cattle that are new to your facility need extra space while they learn the feeding routine.
• High-stress periods. Weather extremes, weaning, vaccination, and handling events all increase stress and competition.
• Inconsistent feed delivery. If feed delivery times vary, cattle wait at the bunk and compete more aggressively when feed arrives.
• Poor bunk condition. Damaged bunks, sharp edges, or uneven surfaces make cattle reluctant to eat and increase the space they need.
• Muddy conditions. When the apron is muddy, cattle spread out more and need additional space to find clean footing.

Bunk Height Guidelines

Bunk height is measured from the ground to the inside lip of the bunk, which is the top edge where cattle reach in to eat. This is the critical measurement because it determines the angle of the animal's head and neck.

Mature Cows

For mature cows, the inside lip of the bunk should be 24 to 30 inches above the ground. This places the feed at a comfortable height for animals that stand 54 to 60 inches tall at the shoulder. The lower end of the range works for smaller-framed cows, and the higher end works for larger-framed cows.

Growing Calves

For calves from weaning to about 800 pounds, the inside lip should be 18 to 22 inches above the ground. Calves are shorter and need lower bunks to reach feed comfortably. If you are building a bunk that calves will use for several months, start at the lower end and let them grow into it.

Feedlot Cattle

For feedlot cattle from about 700 pounds to market weight, the inside lip should be 18 to 24 inches above the ground. Start at the lower end for lighter cattle and move to the higher end as they grow. Some feedlots use adjustable bunks that can be raised as cattle grow.

Bulls

For mature bulls, the inside lip should be 30 to 36 inches above the ground. Bulls are significantly taller than cows and need the extra height to eat comfortably.

Measuring Bunk Height Correctly

To measure bunk height accurately, measure from the ground surface where the cattle stand to the top inside edge of the bunk. Do not measure from the bottom of the bunk or from the outside edge. The ground surface should be the actual standing surface, which is the apron in most designs.

If your bunk sits on a concrete apron that is 4 inches thick, measure from the top of the apron, not from the dirt below it. If the ground settles or the apron gets built up over time, recheck your measurements.

Bunk Depth and Width

The depth of the bunk, measured from the inside lip down to the bottom, determines how much feed the bunk can hold and how easily cattle can reach it. The width of the bunk, measured from front to back at the top, determines the reach distance for cattle.

Inside Depth

For most cattle bunks, an inside depth of 10 to 14 inches works well. This depth holds enough feed for a day or two without being so deep that cattle struggle to reach the bottom. When feed gets low, cattle need to reach down to clean out the last bits. A depth of more than 14 inches makes this difficult for smaller animals.

For creep feeders used by calves, an inside depth of 8 to 10 inches is adequate. Calves have shorter necks and cannot reach as deep.

Top Width

The top width of the bunk, from the outside edge to the inside lip, should be 18 to 24 inches for most cattle. This provides enough surface area to hold feed without spilling and gives cattle a comfortable reach.

The key measurement is the distance from the inside lip to the feed surface. Cattle should be able to reach feed easily without their heads being at an awkward angle. If the bunk is too wide, cattle push feed forward to reach it, which pushes it out of the bunk.

Bottom Width

The bottom of the bunk should be slightly narrower than the top. A bottom width of 12 to 16 inches works well. This tapered shape helps feed settle into the bunk and makes it easier for cattle to clean out the last feed.

Bunk Face Angle

The angle of the inside face of the bunk, from the bottom to the top, affects how easily cattle can reach feed. A face angle of 45 to 50 degrees from horizontal works best for most cattle. This angle lets cattle reach the bottom of the bunk without excessive neck strain.

If the face is too vertical, cattle hit their noses on the back wall when reaching for feed near the bottom. If the face is too sloped, feed slides forward and spills out of the bunk.

For concrete bunks, you can create the proper angle by forming the inside face with a slope. For metal or poly bunks, the manufacturer typically sets the angle, so choose a product designed for cattle feeding.

Apron Design and Drainage

The apron is the concrete or compacted surface in front of the bunk where cattle stand while eating. Proper apron design prevents mud problems and keeps cattle comfortable at the bunk.

Apron Width

The apron should extend 8 to 12 feet in front of the bunk. This gives cattle enough room to stand and eat without crowding. A wider apron also keeps cattle out of the mud when conditions are wet.

For feedlot pens, a 10-foot apron is a good standard. For cow-calf operations where cattle are on pasture, an 8-foot apron is usually adequate.

Apron Slope

The apron should slope away from the bunk at a rate of 1 to 2 percent. This means for every 10 feet of apron, the far edge is 1.2 to 2.4 inches lower than the edge at the bunk. This slope carries water away from the bunk and keeps the feeding area dry.

Do not slope the apron toward the bunk. Water will pool at the base of the bunk, creating mud and damaging the bunk foundation over time.

Bunk Foundation

The bunk itself should sit on a solid foundation that extends below the frost line in cold climates. A concrete footing that is 6 to 8 inches thick and 18 to 24 inches wide provides a stable base. The footing should extend the full length of the bunk.

If you are installing a portable bunk, place it on a level, well-drained surface. Portable bunks need to be moved periodically to prevent mud buildup and to allow the ground underneath to recover.

Bunk Construction Materials

Cattle bunks are available in several materials, each with advantages and disadvantages.

Concrete Bunks

Concrete is the most common material for permanent cattle bunks. It is durable, heavy, and resistant to damage from cattle and equipment. Concrete bunks can be poured in place or purchased as precast sections.

Advantages of concrete include long life, low maintenance, and resistance to tipping. Disadvantages include higher initial cost, difficulty moving once installed, and the potential for rough edges that can injure cattle.

When pouring concrete bunks, use a smooth finish on the inside surfaces to prevent feed buildup and make cleaning easier. Round all exposed edges to prevent injury to cattle mouths and legs.

Metal Bunks

Metal bunks, typically made from galvanized steel or heavy-gauge sheet metal, are lighter than concrete and easier to move. They are common in feedlots where bunks need to be repositioned.

Advantages of metal bunks include lower initial cost, portability, and ease of installation. Disadvantages include the potential for sharp edges, rust over time, and the need for sturdy anchoring to prevent tipping.

When selecting metal bunks, look for rolled edges or protective caps on all exposed metal. Check for sharp corners that could cut cattle mouths.

Poly Bunks

Polyethylene bunks are a newer option that is gaining popularity. They are lightweight, resistant to corrosion, and have smooth surfaces that are easy to clean.

Advantages of poly bunks include durability, resistance to weather, and the ability to be moved easily. Disadvantages include higher cost per foot than metal and the need for anchoring to prevent tipping.

Poly bunks work well for smaller operations and for creep feeding setups where portability matters.

Wood Bunks

Wood bunks are the least common option in modern operations but can work for small farms. They are inexpensive to build but require regular maintenance and replacement.

If you build wood bunks, use treated lumber that resists rot. Smooth all surfaces to prevent splinters. Expect to replace wood bunks every 3 to 5 years depending on weather and use.

How to Calculate Total Bunk Length for Your Operation

To determine how much total bunk length you need, follow these steps.

Step 1: Determine Your Animal Class and Count

Write down the number of animals in each class you will feed. For example, if you have 120 mature cows and 40 growing calves, list them separately because they need different bunk space.

Step 2: Select the Space Per Head

Use the recommendations from the bunk space section above. For this example, use 24 inches per mature cow and 12 inches per growing calf.

Step 3: Calculate Total Inches Needed

Multiply the number of animals by the space per head for each class.

• 120 cows x 24 inches = 2,880 inches
• 40 calves x 12 inches = 480 inches

Total bunk length needed = 2,880 + 480 = 3,360 inches

Step 4: Convert to Feet

Divide total inches by 12 to get feet.

3,360 inches / 12 = 280 feet of bunk

Step 5: Add a Safety Margin

Add 10 to 15 percent to account for uneven distribution of animals along the bunk, dominant animals taking more space, and future herd growth.

280 feet x 1.10 = 308 feet

For this operation, you need approximately 310 feet of bunk space.

Step 6: Plan the Layout

Divide the total bunk length into sections that fit your facility. For example, four bunks of 80 feet each, or two bunks of 155 feet each. Leave alleys between sections for equipment access and for moving cattle.

Adjustable Bunk Systems

If you feed different classes of cattle through the year, consider an adjustable bunk system. These systems allow you to change the height and sometimes the width of the bunk as cattle grow or as you rotate different groups through the facility.

Simple Adjustable Systems

The simplest adjustable system uses a bunk with bolt-on legs that can be repositioned to change height. You loosen the bolts, raise or lower the bunk, and retighten. This works well for operations that feed calves for a few months and then switch to mature cattle.

Hydraulic and Mechanical Systems

Larger feedlots sometimes use hydraulic or mechanical systems that raise and lower the entire bunk. These are expensive but save labor when adjusting multiple bunks regularly.

When to Adjust

Adjust bunk height when the average animal in the group has grown enough that the current height is clearly uncomfortable. As a rule of thumb, adjust when the average animal weight changes by 200 to 300 pounds.

You can also watch for signs that the height is wrong. If cattle are reaching down with their front legs spread wide, the bunk is too low. If they are stretching their necks upward or pushing feed out of the bunk, the bunk is too high.

Bunk Positioning and Orientation

Where you place bunks in your facility affects how cattle use them and how easy they are to service.

Orientation to Wind

In cold climates, orient bunks so cattle face away from prevailing winter winds. This reduces wind chill on cattle while they eat and keeps them more comfortable. In hot climates, orient bunks to take advantage of prevailing summer breezes to help cattle stay cool.

Orientation to Sun

In winter, bunks that face south receive more sun, which helps keep the feeding area warmer and drier. In summer, some shade for the bunk area helps cattle eat more during hot weather.

Distance to Water

Cattle need access to water near the feeding area. Place water sources within 100 to 200 feet of the bunk line. If water is too far away, cattle may not drink enough after eating, which reduces intake and can cause digestive problems.

Equipment Access

Leave enough space behind the bunk for feed delivery equipment. A feed truck or wagon needs a clear alley that is at least 12 to 14 feet wide. If you use a tractor with a front-end loader to fill bunks, allow extra turning space.

Pen Layout

In feedlots, bunks are typically placed along the fence line of each pen. Cattle stand in the pen and reach through or over the fence to eat. The feed alley runs along the opposite side of the fence, outside the pen.

This layout keeps feed delivery equipment out of the pen and lets one alley serve bunks for two pens. It also keeps cattle away from equipment traffic, reducing injury risk.

Feeding Management and Bunk Space Interaction

Bunk space is only one part of a successful feeding program. How you manage feeding interacts with bunk design in important ways.

Feeding Frequency

Cattle fed once per day need more bunk space than cattle fed twice per day. With once-daily feeding, all animals want to eat at the same time, so they need enough space to eat simultaneously. With twice-daily feeding, animals can be more flexible about when they eat.

If you are limited on bunk space, increasing feeding frequency can partially compensate. Feeding half the ration in the morning and half in the afternoon gives subordinate animals two chances to eat.

Feed Delivery Order

The order in which you fill bunks affects competition. Cattle learn which pen gets fed first and may crowd the fence waiting for feed. Vary the order occasionally so the same group does not always get fed last.

Bunk Reading

Bunk reading is the practice of checking bunks before each feeding to see how much feed remains. The goal is to have the bunk empty or nearly empty just before the next feeding. If feed remains, reduce the amount delivered. If the bunk is completely empty well before the next feeding, increase the amount.

Bunk reading works best when bunks are designed so you can see the feed surface clearly. A straight bunk with a consistent depth is easier to read than a curved or variable-depth bunk.

Cleanout Schedule

Bunks need regular cleaning to remove stale feed, mold, and debris. How often you clean depends on the ration and weather.

• In dry weather, clean bunks weekly to remove buildup.
• In wet weather, clean more frequently because feed spoils faster.
• After feeding silage or high-moisture feeds, clean bunks more often.
• With high-concentrate rations, clean bunks at least weekly to prevent sour feed buildup.

A clean bunk is also easier to inspect for signs of digestive upset. If you see cattle not cleaning up their feed, that is an early warning sign of health problems.

Common Bunk Design Mistakes

Learning from common mistakes can save you time and money. Here are the most frequent problems producers encounter.

Mistake 1: Building One Bunk for All Cattle

The most common mistake is building a single bunk height and expecting it to work for cows, calves, and feedlot cattle. Each class of cattle needs different dimensions. If you feed multiple classes, build separate bunks or use adjustable systems.

Mistake 2: Too Little Bunk Space

Underestimating bunk space needs leads to competition, uneven gains, and more aggressive behavior. When in doubt, add 10 to 15 percent more bunk length than your calculations suggest.

Mistake 3: Bunk Too High for Calves

Calves cannot reach feed in a bunk built for mature cows. They will try anyway, which leads to neck strain and feed wastage. If you are feeding calves, lower the bunk or use a creep feeder.

Mistake 4: Poor Drainage

An apron that does not drain properly creates mud around the bunk. Cattle stand in mud to eat, which reduces intake and increases the risk of foot problems. Slope the apron away from the bunk and keep the drainage path clear.

Mistake 5: Sharp Edges

Sharp edges on metal bunks or rough concrete surfaces injure cattle mouths and tongues. Cattle with sore mouths eat less and lose condition. Inspect bunks regularly and repair or cover any sharp edges.

Mistake 6: Bunks Too Deep or Too Shallow

A bunk that is too deep makes it hard for cattle to reach the bottom. A bunk that is too shallow lets feed spill over the sides. Match bunk depth to the class of cattle you are feeding.

Mistake 7: Ignoring Social Dynamics

Placing bunks in a way that creates blind spots or dead ends increases aggression. Cattle need to see approaching animals and have an escape route. Keep bunk lines straight and open.

Mistake 8: No Shade or Windbreak

Cattle eat less when they are heat stressed or cold stressed. Providing shade in summer and wind protection in winter keeps cattle at the bunk and maintains intake.

Decision Thresholds for Bunk Adjustment

Knowing when to adjust your bunk setup is as important as knowing how to build it. Use these thresholds as guidelines.

When to Increase Bunk Space

Increase bunk space when you observe any of these signs:

• Subordinate cattle are visibly thinner than dominant cattle.
• Cattle are fighting at the bunk during every feeding.
• Some cattle wait more than 30 minutes after feed delivery before they can access the bunk.
• The bunk is completely empty within 30 minutes of feeding.
• You are adding new animals to an existing group.

When to Adjust Bunk Height

Adjust bunk height when:

• Cattle are spreading their front legs to reach feed, which means the bunk is too low.
• Cattle are stretching their necks upward or standing back from the bunk, which means the bunk is too high.
• Feed is being pushed out of the bunk consistently, which may mean the bunk is too high or too deep.
• You are changing from one class of cattle to another.

When to Replace Bunks

Replace bunks when:

• The bunk has sharp edges that cannot be repaired.
• The bunk is rusted through or structurally weakened.
• The bunk tips easily or is unstable.
• The bunk surface is so rough that feed buildup is constant.
• The bunk has settled and no longer sits at the correct height.

Monitoring Bunk Performance

Regular monitoring helps you catch problems before they cost you money. Here is what to check and how often.

Daily Checks

At each feeding, check:

• How quickly cattle come to the bunk when feed is delivered.
• Whether all cattle are getting access to feed.
• How much feed remains in the bunk before the next feeding.
• Whether feed is being pushed out of the bunk.
• Whether any cattle are standing back from the bunk instead of eating.

Weekly Checks

Once per week, check:

• Bunk condition for sharp edges, cracks, or damage.
• Feed buildup or mold in the bunk.
• Drainage around the bunk and apron.
• Signs of mud buildup on the apron.
• Whether any bunk sections have shifted or settled.

Monthly Checks

Once per month, check:

• Bunk height measurements to confirm they are still correct.
• Bunk space per head based on current animal weights.
• Whether the bunk needs cleaning or repair.
• Whether cattle condition is even across the group.

Recordkeeping

Keep simple records of bunk observations. A notebook or spreadsheet with these columns works well:

• Date
• Pen or group identifier
• Number of animals
• Average animal weight
• Feed delivered per animal
• Feed remaining at next feeding
• Bunk condition notes
• Health observations

These records help you spot trends. For example, if feed refusals are increasing over several weeks, the ration may need adjustment. If one pen consistently has more aggressive behavior, the bunk space may be inadequate.

Health and Safety Considerations

Bunk design affects cattle health in several ways. Pay attention to these connections.

Digestive Health

Bunk space and design directly affect digestive health. Cattle that cannot access feed when it is delivered tend to binge when they finally get access. This pattern of fasting and bingeing increases the risk of acidosis, bloat, and other digestive upsets.

If you see cattle with diarrhea, reduced intake, or signs of discomfort after feeding, evaluate your bunk space and feeding schedule. More bunk space and more consistent feed delivery can reduce these problems.

Injury Prevention

Bunk design can cause injuries. Sharp edges cut mouths and tongues. Gaps between bunk sections trap feet. Unstable bunks tip and injure cattle. Muddy aprons increase the risk of slips and falls.

Inspect bunks regularly and repair problems promptly. A small repair now prevents a larger injury later.

Respiratory Health

Dust from feed and from the bunk area can irritate cattle lungs. In dry conditions, dust can be significant. Wetting down the apron and the area around the bunk before feeding can reduce dust. Good drainage prevents mud, which dries and becomes dust.

When to Call a Veterinarian

Most bunk design issues are management problems, not health emergencies. However, call a veterinarian if you see:

• Multiple cattle with reduced feed intake that does not improve with bunk adjustments.
• Cattle with persistent diarrhea, bloating, or signs of acidosis.
• Cattle with injuries from bunk equipment that are deep, bleeding, or infected.
• Cattle that are losing condition despite adequate feed delivery.

An extension agent can help with bunk design and feeding management questions. They can also help you evaluate your facility layout and recommend improvements.

Special Situations

Some feeding situations require special bunk design considerations.

Creep Feeding on Pasture

Creep feeders on pasture need to be portable so you can move them to fresh ground. Use a creep feeder with a lower bunk height of 18 to 22 inches and a restricted opening that calves can enter but cows cannot.

Place creep feeders in areas where calves naturally gather, such as near water sources or shade. Move the feeder every 1 to 2 weeks to prevent mud buildup and to spread manure.

Limit Feeding on Pasture

Limit feeding cows on pasture requires bunks that can be moved or that are positioned where you want cows to gather. Portable bunks work well for this system. Place them on firm ground and move them before mud becomes a problem.

Feedlot Finishing

Feedlot finishing requires the most precise bunk management. Use 9 to 12 inches of bunk space per head and feed twice daily on a consistent schedule. Bunk reading is critical in this system to prevent acidosis.

Backgrounding Stressed Calves

Newly received calves need extra bunk space and lower bunk heights. Provide 18 inches of bunk space per head for the first 2 to 3 weeks. Use a bunk height of 18 to 20 inches for calves in the 400 to 600 pound range.

Winter Feeding

Winter feeding creates special challenges. Snow and ice can block bunks and make aprons slippery. Wind can drift snow into bunks. Plan for these conditions by:

• Orienting bunks away from prevailing winds.
• Providing windbreaks near the bunk line.
• Keeping aprons clear of snow and ice.
• Checking bunks more frequently in cold weather.
• Having a backup plan for feed delivery during storms.

Summer Feeding

Summer heat reduces feed intake. Help cattle maintain intake by:

• Providing shade over or near the bunk area.
• Feeding during cooler parts of the day, such as early morning or evening.
• Ensuring adequate water supply near the bunk.
• Keeping the apron clean and dry to reduce dust and flies.

Cost Considerations

Building or upgrading cattle bunks is a capital investment. Here are the cost factors to consider.

Initial Construction Costs

Concrete bunks cost more to install than metal or poly bunks but last longer. The cost includes site preparation, forms, concrete, and labor. Precast concrete bunks cost more per foot than poured bunks but install faster.

Metal bunks have lower initial cost but may need replacement after 10 to 15 years. Poly bunks have moderate initial cost and long life but cost more than metal.

Maintenance Costs

Concrete bunks need occasional repair of cracks and spalled edges. Metal bunks need rust repair and edge replacement. Poly bunks need minimal maintenance.

Operating Costs

The main operating cost related to bunks is feed waste. A well-designed bunk reduces waste by keeping feed in the bunk where cattle can eat it. Even a 5 percent reduction in feed waste can pay for a new bunk over time.

Labor Costs

Bunks that are easy to fill and clean reduce labor costs. Straight bunks with smooth surfaces are faster to service than curved bunks with rough surfaces. Consider labor costs when choosing bunk materials and design.

Planning a New Bunk Installation

If you are installing new bunks, follow these steps for a successful project.

Step 1: Assess Your Needs

Write down your current animal inventory and your expected inventory for the next 5 years. Include the classes of cattle you will feed and your feeding system.

Step 2: Calculate Bunk Space

Use the calculations from the section above to determine total bunk length needed. Add 10 to 15 percent for safety margin.

Step 3: Select Bunk Type

Choose concrete, metal, poly, or wood based on your budget, expected life, and maintenance preferences. Consider whether you need portability.

Step 4: Design the Layout

Sketch your facility layout showing bunk placement, apron width, drainage, water access, and equipment access. Include wind and sun orientation.

Step 5: Prepare the Site

Grade the site for proper drainage. Install the apron with the correct slope. Pour the footing for permanent bunks.

Step 6: Install the Bunks

Set the bunks at the correct height for your cattle. Anchor them securely. Check all edges for sharpness.

Step 7: Test and Adjust

Before turning cattle into the facility, test the bunks by filling them with feed. Check that the height is correct and that feed stays in the bunk. Make adjustments before cattle are present.

Step 8: Train Your Cattle

When you first introduce cattle to new bunks, expect some hesitation. Feed a small amount of highly palatable feed to attract cattle to the bunk. Monitor the first few feedings to ensure all cattle are eating.

Retrofitting Existing Bunks

If you have existing bunks that are not working well, you may be able to retrofit them rather than replace them.

Raising Bunk Height

You can raise a concrete bunk by adding a cap or extension on top of the existing bunk. This works if the existing bunk is structurally sound and the extension is properly anchored.

Lowering Bunk Height

Lowering a bunk is more difficult. You can remove the top portion of the bunk, but this is labor-intensive and may weaken the structure. In some cases, lowering the ground surface in front of the bunk is easier than lowering the bunk itself.

Adjusting Bunk Space

If you need more bunk space, you can add bunk sections to the existing line. Ensure the new sections match the height and depth of the existing bunk.

Improving Drainage

If drainage is poor, you can regrade the apron or add drainage channels. In severe cases, you may need to replace the apron.

Regional Considerations

Bunk design needs vary by region and climate.

Cold Climates

In cold regions, orient bunks to minimize wind exposure. Use concrete bunks that resist frost damage. Ensure footings extend below the frost line. Plan for snow removal around bunks.

Hot Climates

In hot regions, provide shade over or near the bunk area. Orient bunks to take advantage of prevailing breezes. Use materials that do not absorb excessive heat, such as light-colored poly or concrete.

Wet Climates

In wet regions, drainage is critical. Use wider aprons with more slope. Consider raised bunks that keep feed above mud level. Clean bunks more frequently to prevent feed spoilage.

Dry Climates

In dry regions, dust is a concern. Use aprons that can be watered down to control dust. Consider windbreaks to reduce dust movement.

Frequently Asked Questions

How much bunk space does a beef cow need?

A mature beef cow needs 18 to 30 inches of bunk space depending on the feeding system. For limit-fed cows that receive feed once daily, provide 24 to 30 inches per head. For cows on full feed where feed is available most of the day, 18 to 24 inches per head is adequate. The higher end of each range is safer when you have aggressive or competitive cows.

What is the correct height for a cattle feed bunk?

The correct height depends on the class of cattle. For mature cows, the inside lip of the bunk should be 24 to 30 inches above the ground. For growing calves, use 18 to 22 inches. For feedlot cattle, use 18 to 24 inches. For mature bulls, use 30 to 36 inches. Measure from the ground where cattle stand to the top inside edge of the bunk.

Can I use the same bunk for cows and calves?

You can use the same bunk for cows and calves only if the bunk height works for both. In most cases, a bunk built for mature cows is too high for calves. If you need to feed both classes, consider a creep feeder for calves or an adjustable bunk system that lets you change height as the animals grow.

How do I know if my bunk is too high?

If your bunk is too high, cattle will stretch their necks upward to reach feed, stand back from the bunk, or push feed out of the bunk trying to get at it. They may also eat less than expected. Watch cattle at feeding time and adjust the bunk height if you see these signs.

How do I know if my bunk is too low?

If your bunk is too low, cattle will spread their front legs and reach down to get feed. They may also have difficulty swallowing because their heads are angled down. Over time, this posture causes neck and shoulder strain. Raise the bunk or add a base under it if you see this pattern.

What is the best material for a cattle feed bunk?

Concrete is the most durable and longest-lasting material for permanent bunks. It resists damage from cattle and equipment and requires minimal maintenance. Metal bunks are lighter and more portable but may rust and develop sharp edges. Poly bunks are lightweight, corrosion-resistant, and easy to clean but cost more than metal. Choose based on your budget, whether you need portability, and your expected lifespan.

How often should I clean my cattle feed bunks?

Clean bunks at least weekly to remove stale feed, mold, and debris. Clean more frequently in wet weather or when feeding high-moisture feeds. Bunks used for high-concentrate rations should be cleaned at least weekly to prevent sour feed buildup. A clean bunk also makes it easier to spot health problems early.

What apron width do I need in front of my cattle feed bunk?

The apron should extend 8 to 12 feet in front of the bunk. This gives cattle enough room to stand and eat without crowding. A wider apron keeps cattle out of mud during wet weather. Slope the apron away from the bunk at 1 to 2 percent so water drains away from the feeding area.

Related Farming Guides

This section will be populated with related farming guides from our library. Check back for links to articles on cattle nutrition, feedlot management, pasture management, and beef cattle health.

Related Clinical & Scientific Guides

• Cattle Head Gate Selection and Adjustment
• Beef Cattle Handling Facility Flow
• Beef Cattle Maternity Pen Design: Comfort and Monitoring

References

• Beef Cattle Research Council: https://www.beefresearch.ca/
• USDA APHIS Cattle Health: https://www.aphis.usda.gov/livestock-poultry-disease/cattle
• WOAH Terrestrial Animal Health Code: https://www.woah.org/en/what-we-do/standards/codes-and-manuals/terrestrial-code-online-access/
• FAO Animal Production and Health: https://www.fao.org/animal-production/en/
• WOAH (World Organisation for Animal Health): https://www.woah.org/en/home/

This article is educational and is not a substitute for veterinary diagnosis, treatment, public-health guidance, or regulatory reporting.