# Beef Cattle Feed Storage Design: Silos, Bunkers, and Sheds ## Key Takeaways - Feed storage design directly impacts dry matter losses, which can range from 15-30% with poor planning, affecting feed quality, labor, and cost per pound of gain. - Silage storage losses vary significantly by type: oxygen-limiting upright silos exhibit 3-8% dry matter loss, conventional uprights 8-12%, bunkers 10-15%, and drive-over piles 15-25%, assuming good management. - Bunker silos require a minimum feedout rate of 6-12 inches per day in warm weather to prevent spoilage, necessitating careful packing to achieve densities of 14-16 lbs dry matter/cubic foot. - Hay sheds are critical for reducing weather-related losses, which can exceed 20-30% for outdoor storage, with a typical shed paying for itself within 2-3 years in high-rainfall areas. - Effective feed storage necessitates planning for at least 12 months of capacity to mitigate drought and harvest delays, alongside meticulous recordkeeping of dry matter content, inventory, and spoilage to inform future decisions. - Drainage is paramount; all storage sites require a plan to manage surface water and capture silage effluent, a highly polluting liquid byproduct of ensiling high-moisture forage. --- Feed storage is one of the most important investments on a beef cattle operation, yet it is often planned last and built on a budget that guarantees future losses. The way you store forage, grain, and byproducts directly affects dry matter losses, feed quality, labor requirements, and ultimately the cost per pound of gain. Poor storage design can waste 15 to 30 percent of the feed you harvest before a single animal takes a bite. This guide is for beef producers, farm managers, and agricultural planners who are designing a new feed storage system or upgrading an existing one. It covers the three main storage categories: silos for fermented feeds, bunkers and piles for high-volume silage, and sheds for hay and dry feed. You will learn how to match storage type to herd size, how to size each structure, how to manage feedout to minimize spoilage, and how to avoid the common design mistakes that cost thousands of dollars in lost feed. ## At a Glance - Match storage type to your herd size and feeding rate. A 100-cow herd needs different infrastructure than a 2,000-head feedlot. - Plan for at least 12 months of storage capacity for hay and silage to protect against drought years and harvest delays. - Bunkers are the lowest-cost option for large volumes of silage but require careful packing, sealing, and face management to control losses. - Upright silos have higher initial cost but lower storage losses and smaller working footprint compared to bunkers. - Hay sheds pay for themselves when weather damage exceeds the cost of the building, which happens quickly in high-rainfall regions. - Feedout rate determines spoilage losses. A silage face must be removed at a minimum rate of 6 to 12 inches per day in warm weather. - Drainage is non-negotiable. Every storage site needs a plan for keeping water away from feed and capturing silage effluent. - Keep records of feed inventory, dry matter content, and spoilage losses to make better storage decisions each year. ## Understanding Feed Storage Losses and Why Design Matters Feed storage losses happen in every system. The goal of good design is not to eliminate losses entirely, which is impossible, but to reduce them to an acceptable level and to make the remaining losses predictable and manageable. ### Types of storage losses Dry matter loss is the most visible form of feed loss. It represents feed that was harvested but never consumed by an animal. Dry matter losses occur during four phases: respiration after harvest, fermentation during storage, seepage or effluent loss, and spoilage during feedout. Respiration losses begin immediately after harvest. Plant cells continue to respire, consuming sugars and producing heat and carbon dioxide. This process stops when oxygen is depleted in an airtight environment or when the feed dries below about 20 percent moisture. Every hour of delay between harvest and proper storage increases respiration losses. Fermentation losses occur during the ensiling process. Some dry matter is always consumed by the fermentation bacteria that preserve the silage. Well-managed silage loses about 5 to 8 percent of its dry matter during fermentation. Poorly managed silage can lose 15 percent or more. Seepage losses happen when silage moisture exceeds about 65 to 70 percent. The weight of the silage mass squeezes out plant juices that carry dissolved sugars and nutrients. These liquids are highly polluting and represent lost feed value. Feedout losses are the most controllable and often the largest. When a silage face or hay bale is exposed to air, spoilage organisms begin growing immediately. The outer layer of a silage face can lose significant dry matter within days if the feedout rate is too slow. ### How design influences each loss type Storage design affects every one of these loss categories. An upright oxygen-limiting silo minimizes respiration and feedout losses but has high construction costs. A bunker silo has lower construction costs but requires more management attention to packing density, sealing, and face management. A hay shed protects bales from weather but does nothing to stop internal heating if bales are stored too wet. The right design balances four factors: capital cost, annual operating cost, expected storage losses, and labor requirements. A design that minimizes losses but requires excessive labor may not be the best choice. A design that is cheap to build but loses 20 percent of feed may be the most expensive option over time. ## Assessing Your Operation Before Choosing a Storage System Before you look at any specific storage structure, take stock of your operation. The best storage design for your neighbor may be wrong for you because of differences in herd size, feeding program, climate, and available labor. ### Herd size and daily feed requirements Calculate your daily feed requirement first. This number drives everything else in the design process. For silage, a mature beef cow consuming 2.5 percent of her body weight in dry matter per day will eat about 25 to 30 pounds of dry matter. If silage is 35 percent dry matter, that translates to roughly 70 to 85 pounds of as-fed silage per cow per day when silage is the primary forage. A 100-cow herd needs about 7,000 to 8,500 pounds of silage per day during the feeding period. For hay, the same cow will consume about 25 to 30 pounds of hay dry matter per day. Round bales weighing 1,000 to 1,200 pounds as-fed will supply one cow for about 30 to 40 days depending on waste. Multiply your daily requirement by the number of feeding days to get your annual storage requirement. Then add 10 to 15 percent buffer for weather delays, harvest losses, and feeding waste. ### Feeding season length Some operations feed year-round. Others feed only during a 120-day winter period. Your storage capacity should match your feeding season plus a buffer. If you feed silage for only 120 days, you need enough storage for 120 days of feed plus the buffer. If you feed year-round, you need storage for 365 days plus the buffer. The same herd size can need three times more storage capacity depending on feeding season. ### Climate and rainfall patterns Climate determines which storage types are practical and how much weather protection you need. In low-rainfall regions, uncovered piles and outdoor bale storage may be acceptable. In high-rainfall regions, covered storage pays for itself quickly. Consider your average annual rainfall, the timing of that rainfall relative to your harvest and feeding season, and your typical winter temperatures. Cold climates slow spoilage organism growth during winter feeding but create challenges with frozen feed and snow removal around storage structures. ### Labor availability and management skill Every storage system requires some management. Bunkers require careful packing, sealing, and daily face management. Upright silos require less daily management but more maintenance of unloaders and safety equipment. Hay sheds require attention to bale moisture at harvest and proper stacking. Be honest about the labor you have available. A system that requires daily attention will fail if you cannot commit to that schedule. A system that requires less daily labor but more capital may be the better investment for an operation with limited labor. ### Available equipment Your existing equipment constrains your storage options. Bunker silos require a tractor with enough horsepower to pack the silage properly. Upright silos require a silo unloader. Hay sheds require a loader or skid steer to stack bales. If you already own a large tractor, a bunker may be more attractive. If you do not want to invest in additional equipment, a custom-harvested upright silo or a hay shed with a simple stacking system may be better. ## Silage Storage Options Compared Silage storage systems fall into three main categories: upright silos, bunker silos, and drive-over piles. Each has distinct advantages and disadvantages that make it suitable for different operations. ### Upright silos Upright silos are tall cylindrical structures made of concrete staves, steel, or concrete. They come in two basic types: conventional silos that allow some air exchange and oxygen-limiting silos that are sealed to exclude air. Conventional concrete stave silos are the traditional choice on dairy and beef operations. They are filled from the top and unloaded from the bottom or side. The silage is held in place by its own weight and the structure of the silo. These silos work well for silage in the 60 to 70 percent moisture range. Oxygen-limiting silos, often called sealed or air-tight silos, are made of glass-lined steel and are designed to exclude oxygen entirely. They can store drier silage and high-moisture grain with minimal spoilage. They have the lowest storage losses of any silage system, often below 5 percent dry matter loss. Advantages of upright silos include low dry matter losses, small land footprint, and good feed quality preservation. They work well for operations with limited space near the feeding area. They also have a long service life, often 30 years or more with proper maintenance. Disadvantages include high initial cost, the need for specialized unloader equipment, and the danger of silo gas during filling. Conventional silos require regular maintenance of the unloader and the silo structure. Oxygen-limiting silos are the most expensive option per ton of storage capacity. Upright silos are most economical for operations feeding 100 to 500 cows where the high capital cost can be spread over enough tons to make the per-ton cost competitive. ### Bunker silos Bunker silos are horizontal structures with three walls and a floor. They are filled by packing silage in thin layers with a tractor, then sealed with plastic sheeting. The silage is removed from the open face with a loader or defacer. Bunker silos are the most common large-volume silage storage on beef operations. They work well for herds of 200 cows or more or for operations feeding large quantities of silage. Advantages of bunkers include lower cost per ton of storage capacity, flexibility in size, and the ability to fill quickly with high-capacity harvest equipment. They can be expanded or modified more easily than upright silos. They also allow for easy visual inspection of feed quality. Disadvantages include higher storage losses than upright silos, the need for careful packing and sealing, and the requirement for daily face management during feedout. Bunkers also require more land area and produce effluent that must be managed. The key to bunker success is packing density. Silage should be packed at a density of at least 14 to 16 pounds of dry matter per cubic foot. This requires packing in thin layers of 6 inches or less and using a tractor that weighs at least 800 pounds per foot of silage depth. ### Drive-over piles Drive-over piles are the simplest form of silage storage. Silage is piled on a concrete pad or well-drained ground and packed with a tractor. The pile is then sealed with plastic and weighted down. Drive-over piles have the lowest construction cost of any silage storage option. They are common on large beef operations where the low cost per ton outweighs the higher storage losses. The main disadvantage is higher dry matter losses compared to bunkers or upright silos. Piles have more surface area exposed to the elements and are harder to pack to high density. They also require more plastic sheeting and more careful management of the feedout face. Drive-over piles are best suited to operations feeding more than 500 cows or those that can feed out a pile quickly during the feeding season. They are also a good option for temporary storage when permanent structures are not yet built. ### Comparing costs and losses The table below shows typical ranges for storage losses and relative costs for each silage system. | Storage Type | Expected Dry Matter Loss | Relative Cost per Ton | Best Operation Size | |---|---|---|---| | Oxygen-limiting upright silo | 3 to 8 percent | Highest | 100 to 500 cows | | Conventional upright silo | 8 to 12 percent | High | 100 to 500 cows | | Bunker silo | 10 to 15 percent | Moderate | 200+ cows | | Drive-over pile | 15 to 25 percent | Lowest | 500+ cows | These loss figures assume good management. Poor management can double the losses in any system. Excellent management can reduce losses in bunkers and piles to levels approaching conventional upright silos. ## Bunker Silo Design and Construction Bunker silos are the most popular silage storage choice for beef operations because they balance cost, capacity, and management requirements. A well-designed bunker will serve you for decades, so it is worth getting the details right. ### Sizing the bunker Calculate the bunker dimensions based on your daily feed requirement and desired storage capacity. The formula is straightforward: total silage needed divided by silage density gives you the required volume. Start with your daily silage requirement in pounds as-fed. Multiply by the number of days you want to store. Add 10 percent for settling and surface spoilage. This gives you the total as-fed volume needed. Silage density in a well-packed bunker ranges from 40 to 50 pounds of as-fed silage per cubic foot for 30 to 35 percent dry matter silage. For planning purposes, use 45 pounds per cubic foot. For example, if you need 400 tons of silage as-fed (800,000 pounds), divide by 45 pounds per cubic foot to get about 17,800 cubic feet of storage volume. Choose a bunker width that matches your feedout equipment. The width should be at least 4 to 6 feet wider than your loader bucket to allow efficient face removal. Common bunker widths range from 20 to 40 feet. Bunker height is determined by your packing tractor and unloading equipment. Most bunkers are 8 to 12 feet high at the walls. The silage will settle to about 10 to 15 percent below the wall height during filling and fermentation. Length is then calculated by dividing the required volume by the cross-sectional area. A bunker that is 30 feet wide and 10 feet high has a cross-sectional area of about 300 square feet. Dividing 17,800 cubic feet by 300 square feet gives a length of about 60 feet. ### Concrete specifications Bunker floors and walls should be reinforced concrete. The floor should be at least 5 to 6 inches thick with reinforcing mesh or rebar. The walls should be 8 to 12 inches thick with vertical rebar tied into the floor. Use concrete with a minimum compressive strength of 3,500 to 4,000 psi. Add a vapor barrier under the floor to prevent moisture migration. The floor should have a slight slope of 1 to 2 percent away from the walls to direct effluent to a collection point. Wall height should match your filling and packing equipment. Walls that are too high make filling difficult. Walls that are too low limit packing density and increase surface spoilage. A wall height of 10 to 12 feet works well for most operations. ### Drainage and effluent management Water is the enemy of silage storage. Design the bunker site with drainage in mind from the start. The bunker floor should be elevated slightly above the surrounding grade so that surface water drains away from the structure. Install a perimeter drain around the bunker to intercept runoff before it reaches the feed. Silage effluent is a byproduct of ensiling high-moisture forage. It is highly polluting and can kill fish if it reaches waterways. Design an effluent collection system that captures seepage from the bunker floor and directs it to a storage tank or vegetative treatment area. Effluent production is highest during the first few weeks after filling. Expect about 10 to 20 gallons of effluent per ton of silage at 70 percent moisture. At 60 percent moisture, effluent drops to about 5 gallons per ton. At 50 percent moisture, effluent is minimal. ### Filling and packing procedures The way you fill the bunker determines the quality of the silage and the losses you will experience. Follow these steps for best results. Harvest at the correct moisture. For bunker silos, target 60 to 65 percent moisture for conventional storage and 55 to 60 percent for oxygen-limiting systems. Silage that is too wet produces effluent and poor fermentation. Silage that is too dry is difficult to pack and spoils quickly. Fill in thin layers. Spread each load of silage in a layer of 6 inches or less across the entire bunker surface. This allows the packing tractor to compress each layer thoroughly before the next layer is added. Pack continuously. The packing tractor should operate continuously during filling, not just at the end of the day. Each layer should be packed for at least 2 to 3 minutes per foot of depth. The goal is to eliminate air pockets that allow spoilage organisms to grow. Pack with the right tractor. The packing tractor should weigh at least 800 pounds per foot of silage depth. A 10-foot-deep bunker needs a packing tractor weighing at least 8,000 pounds. Heavier tractors with wider tires achieve better density. Seal the bunker immediately after filling. Cover the silage with 6-mil plastic sheeting within 24 hours of completing the fill. Weight the plastic down with tires or sandbags placed every 2 to 3 feet. Check the seal regularly and patch any tears or holes. ### Feedout management The feedout phase is where many bunker silos lose their value. Proper face management is essential to minimize spoilage. Remove silage from the entire face each day. The face should be cut vertically from top to bottom, not just scooped from the top. This keeps the face fresh and minimizes the surface area exposed to air. The minimum feedout rate depends on temperature. In warm weather above 70 degrees Fahrenheit, remove at least 12 inches from the face daily. In cool weather below 50 degrees, 6 inches per day may be sufficient. Slower feedout rates allow spoilage organisms to grow into the silage mass. Use a defacer or loader to cut the face cleanly. A ragged face has more surface area and spoils faster than a smooth face. Keep the floor clean of loose silage that can spoil and contaminate fresh silage. ## Upright Silo Design and Management Upright silos require different design and management considerations than bunkers. They are a bigger capital investment but offer lower labor requirements and better feed preservation. ### Choosing between conventional and oxygen-limiting Conventional concrete stave silos are the standard choice for beef operations storing silage at 60 to 70 percent moisture. They cost less than oxygen-limiting silos and are simpler to operate. They do allow some air exchange through the walls, which causes surface spoilage along the silo wall. Oxygen-limiting silos cost substantially more but offer the lowest storage losses of any system. They can store drier silage and high-moisture grain. They are the best choice when feed quality is critical and the operation can justify the higher cost. ### Sizing and site considerations Upright silos are sized by diameter and height. Common diameters range from 14 to 30 feet. Heights range from 40 to 80 feet. The volume increases with both diameter and height, but the cost does not increase proportionally, so taller silos are more economical per ton. Site the silo close to the feeding area to minimize delivery distance. Allow adequate space for the silo unloader and for trucks to access the silo for filling. The silo should be on firm, level ground with good drainage. Consider the foundation requirements. Upright silos are heavy structures that require engineered foundations. The foundation must support the weight of the silo, the silage, and the unloader. A soil test and structural engineer should be consulted before construction. ### Filling and management Fill upright silos in the same manner as bunkers, using thin layers and continuous packing. The silo unloader will do the final distribution and leveling. The key difference with upright silos is the unloading process. The silo unloader removes silage from the top of the silo and throws it down the chute. This means the feedout face is the top surface, not a vertical face like a bunker. Silo unloaders require regular maintenance. Check the cutting knives, augers, and drive chains before each filling season. Keep spare parts on hand to minimize downtime. ### Safety considerations Upright silos present unique safety hazards that require attention. Silo gas is produced during the first few days after filling. Nitrogen dioxide gas is highly toxic and can be fatal if inhaled. Keep people away from the silo for at least 2 to 3 weeks after filling. Ventilate the silo from the top before entering. Never enter a silo while the unloader is running. The unloader can cause serious injury or death. Use a safety harness and rope when entering a silo for any reason. Silo structure failure is a risk in older silos. Inspect the silo regularly for cracks, rust, and structural deterioration. Have a professional inspect the silo every few years, especially if it is more than 20 years old. ## Hay Storage Shed Design Hay storage is often treated as an afterthought, but the difference between good and poor hay storage can be 20 to 30 percent of the harvested crop. A hay shed is one of the highest-return investments on a beef operation. ### Why hay sheds pay for themselves Weather damage is the largest source of hay loss for operations that store bales outdoors. Rain and snow leach nutrients from the outer layer of bales, causing dry matter and quality losses that extend several inches into the bale. Studies of outdoor hay storage show dry matter losses of 10 to 30 percent depending on climate, bale type, and storage method. A hay shed reduces these losses to 2 to 5 percent. The economic calculation is simple. If you store 500 bales weighing 1,000 pounds each and lose 20 percent of their value to weather, you have lost the equivalent of 100 bales. At $100 per bale, that is $10,000 lost per year. A hay shed costing $20,000 pays for itself in two years. ### Shed design options Hay sheds range from simple pole barns to fully enclosed buildings. The right design depends on your climate, bale type, and budget. A pole barn with a metal roof and open sides is the most common hay shed design. It protects bales from rain and snow while allowing air circulation to carry away moisture. Open sides also allow easy access with a loader. A fully enclosed shed provides the best protection but costs more and can trap moisture if not ventilated properly. Enclosed sheds are best for high-value hay or for operations in very wet climates. A simple roof-only structure with no walls is the lowest-cost option. It protects bales from rain and snow but does not protect against wind-driven rain or ground moisture. This design works best in dry climates. ### Sizing the hay shed Calculate your hay storage needs the same way you calculate silage needs. Determine your annual hay requirement, then add a buffer for drought years and harvest variability. A standard round bale that is 5 feet in diameter and 5 feet wide contains about 75 cubic feet and weighs 1,000 to 1,200 pounds. A standard large square bale that is 3 feet by 3 feet by 8 feet contains 72 cubic feet and weighs about 1,000 pounds. For round bales stored on their flat end, each bale requires about 25 square feet of floor space. For bales stacked two high, each bale requires about 12.5 square feet. For large square bales, each bale requires about 24 square feet when stacked three high. Add 20 to 30 percent to your floor space calculation for aisles, handling space, and the fact that bales are not perfectly uniform. ### Building specifications The shed should have a concrete floor or a well-drained gravel base. Concrete is preferred because it prevents ground moisture from wicking into the bales and provides a clean surface for handling equipment. The roof should extend at least 2 to 3 feet beyond the walls to protect bales from wind-driven rain. The ridge height should be at least 14 to 16 feet to allow stacking bales two high with a loader. Ventilation is critical. Open-sided sheds should have at least 50 percent open wall area to allow air movement. If you enclose the shed, install ridge vents and wall vents to create continuous air flow. ### Hay shed management A hay shed only works if you manage it properly. Store only dry hay in the shed. Hay that is baled above 18 to 20 percent moisture can heat and spontaneously combust, even in a well-ventilated shed. Check moisture at baling and reject any bales that are too wet. Leave space between bales and walls. Air circulation is essential for drying and preventing condensation. Leave at least 6 inches between the outer bales and the shed walls. Stack bales in a stable pattern. Round bales should be stacked on their flat end with the round surface facing up. Large square bales should be stacked in a brick pattern with overlapping joints for stability. Inspect stored hay regularly. Check for signs of heating, mold, or rodent damage. A bale that is heating will have a musty smell and may be warm to the touch. Remove damaged bales promptly to prevent contamination of adjacent bales. ## Grain and Concentrate Storage Beef operations that feed grain need dedicated storage for corn, barley, or other concentrates. Grain storage has different requirements than forage storage because of the need to maintain low moisture and protect against insects and rodents. ### Grain bin options Steel grain bins are the most common on-farm grain storage. They come in sizes from small bins holding a few thousand bushels to large bins holding 100,000 bushels or more. Steel bins are durable, relatively inexpensive, and can be equipped with aeration systems. For smaller operations, gravity wagons, grain bags, or even well-ventilated sheds can serve as temporary grain storage. These options have higher losses and require more management but may be acceptable for short-term storage. High-moisture grain can be stored in oxygen-limiting silos or in sealed bunkers. This approach allows harvest at higher moisture, reducing drying costs, and produces a highly palatable feed for cattle. ### Grain storage requirements Grain must be stored at or below 14 percent moisture for long-term storage in conventional bins. At higher moisture, mold growth and insect activity increase rapidly. Aeration is essential for grain storage. Aeration fans move air through the grain to equalize temperature and remove moisture. The aeration system should be sized to move at least 1/10 cubic foot of air per minute per bushel of grain. Grain bins should be cleaned thoroughly before each filling. Old grain, dust, and debris harbor insects and mold spores. Clean the bin floor, walls, and aeration ducts before adding new grain. ### Grain storage safety Grain bins are one of the most dangerous places on a farm. Flowing grain can trap and suffocate a person in seconds. Never enter a grain bin while grain is flowing. Use a harness and lifeline if you must enter a bin for any reason. Lock out all augers and unloading equipment before entering. Grain dust is explosive. Keep the bin area free of dust accumulation and prohibit smoking and open flames near grain storage. ## Common Storage Design Mistakes and How to Avoid Them Many beef operations make the same storage design mistakes. Recognizing these problems before you build can save thousands of dollars. ### Undersizing storage capacity The most common mistake is building too little storage. Producers calculate their needs based on an average year and then find themselves short during a drought or after a poor harvest. Build at least 12 months of storage capacity, even if you plan to feed for only 4 to 6 months. The extra capacity protects against harvest failures and allows you to buy feed when prices are low. ### Ignoring drainage Water damage is the leading cause of feed loss in every storage system. Many producers build storage structures without considering where water will go during a heavy rain. Every storage site needs a drainage plan. The site should be graded to direct water away from feed. Perimeter drains should intercept surface runoff. Effluent from silage should be collected and treated. ### Poor packing and sealing Bunker silos and piles fail when they are not packed and sealed properly. Thin layers, continuous packing, and immediate sealing are not optional steps. They are the difference between 10 percent losses and 25 percent losses. ### Inadequate feedout planning Many producers build storage without thinking about how they will remove feed. The result is awkward access, slow feedout rates, and excessive spoilage. Plan the feedout process before you build. Consider the size of your loader, the access route to the feeding area, and the daily feedout rate you can achieve. Design the storage structure to match your equipment and labor. ### Forgetting about safety Storage structures create safety hazards that are easy to overlook during the planning phase. Silo gas, flowing grain, collapsing piles, and falls from heights are all real risks. Build safety into the design. Include guardrails, safety ladders, and warning signs. Establish safe operating procedures for filling, unloading, and entering storage structures. ## Monitoring and Recordkeeping for Feed Storage Good recordkeeping helps you evaluate your storage system and make better decisions over time. Track the following metrics for each storage structure. ### Dry matter content Measure the dry matter of feed as it goes into storage and as it comes out. The difference between the two, adjusted for weight, is your storage loss. Use a moisture meter or send samples to a lab for analysis. Record the results for each load or batch. Over time, this data tells you which storage methods work best on your operation. ### Feed inventory Keep a running inventory of feed in each storage structure. Record the amount of feed added, the amount removed, and the date of each event. A simple spreadsheet works well for most operations. Update it every time you fill or remove feed. This information helps you plan next year's storage needs and identify unexpected losses. ### Spoilage observations Record any visible spoilage you observe during feedout. Note the location, extent, and likely cause of the spoilage. This information helps you identify management problems before they become costly. ### Cost tracking Track the cost of each storage system, including construction, maintenance, and labor. Divide by the tons of feed stored to get your cost per ton. Compare this across storage types to make informed decisions about future investments. ## When to Call a Veterinarian or Extension Agent Most feed storage problems are management issues that you can solve with good practices and planning. However, some situations require professional help. ### Moldy feed and mycotoxin concerns If you suspect that feed has significant mold growth or mycotoxin contamination, contact your veterinarian or extension agent. Mycotoxins can cause serious health problems in cattle, including reduced feed intake, poor weight gain, reproductive issues, and immune suppression. Your veterinarian can help you assess the risk and determine whether the feed is safe to feed. Your extension agent can help you get feed samples tested for mycotoxins. ### Feed-related illness in cattle If cattle show signs of illness that you suspect are related to feed, contact your veterinarian immediately. Symptoms such as off-feed, diarrhea, neurological signs, or sudden death can indicate feed toxicity or contamination. Keep samples of the suspect feed for testing. Do not feed suspect feed to other animals until the problem is identified. ### Design and construction advice Your local extension agent can provide valuable advice on feed storage design. Many extension services have publications, calculators, and specialists who can help you size and design storage structures. Contact your extension agent before you build, not after. A 30-minute consultation can save you thousands of dollars in design errors. ## Frequently Asked Questions ### What is the cheapest way to store silage for a small beef herd? For a herd of 50 to 100 cows, the cheapest silage storage option is often a drive-over pile on a well-drained concrete pad. You can also consider using a used upright silo if one is available at a reasonable price. The key is to match the storage size to your feeding rate so that you can remove at least 6 inches from the face daily in warm weather. A small pile that takes months to feed out will have heavy spoilage losses that negate the low construction cost. ### How much does a bunker silo cost per ton of storage capacity? Construction costs vary widely by region and site conditions, but a typical concrete bunker silo costs between $15 and $30 per ton of storage capacity. This includes the concrete floor and walls, site preparation, and drainage. The cost per ton decreases as the bunker gets larger because the floor and wall costs are spread over more storage volume. Compare this to upright silos, which typically cost $40 to $80 per ton of capacity. ### Can I store round hay bales outside without a shed? Yes, you can store round bales outside, but you will lose 10 to 30 percent of the dry matter to weather damage depending on your climate. To minimize losses, place bales on a well-drained gravel base, orient them in rows with the flat ends facing the prevailing wind, and leave 2 to 3 feet between rows for air circulation. Do not stack bales more than two high, and do not place bales under trees where they will be shaded and stay wet longer. ### How long does silage keep in a bunker after the plastic is opened? Once you open a bunker silo and start feeding, the silage will stay good as long as you remove at least 6 to 12 inches from the face daily. If you stop feeding for more than a few days, the exposed face will begin to spoil. In warm weather, visible spoilage can appear within 3 to 5 days. The spoiled layer must be removed before feeding resumes. This is why it is important to size your bunker to match your daily feedout rate. ### What is the best moisture content for silage in a bunker? The ideal moisture content for bunker silage is 60 to 65 percent. At this moisture, fermentation proceeds properly without producing excessive effluent. Silage above 70 percent moisture will produce significant effluent, lose nutrients, and have a sour, clostridial fermentation. Silage below 55 percent moisture is difficult to pack, traps air, and spoils quickly. If you are using an oxygen-limiting silo, you can store silage at 55 to 60 percent moisture. ### How do I calculate how much silage I need to store for my herd? Multiply your daily silage requirement per cow by the number of cows and the number of feeding days. For example, a 100-cow herd eating 70 pounds of as-fed silage per cow per day for 150 days needs 1,050,000 pounds or 525 tons of silage. Add 10 to 15 percent for settling and spoilage losses, giving you about 580 to 600 tons of storage capacity. Divide by the silage density of 45 pounds per cubic foot to get the required storage volume. ### Should I invest in a hay shed or a bunker silo first? This depends on your current feeding program and your greatest loss source. If you feed mostly hay and lose 20 percent or more to weather damage, a hay shed will pay for itself quickly. If you feed silage and are losing feed to spoilage because of poor storage, a bunker silo may be the better investment. Calculate your annual losses in each system and compare them to the cost of the improvement. The option that reduces losses the most per dollar invested should be your first priority. ### What safety precautions should I take when filling a silo? When filling an upright silo, keep people away from the silo for at least 2 to 3 weeks after filling to avoid silo gas exposure. Never enter a silo while the unloader is running. Use a safety harness and rope when entering a silo for any reason. For bunker silos, keep people away from the packing tractor and the silage face. Never allow anyone to stand near the face while silage is being removed, as chunks of silage can fall and cause injury. ## Related Farming Guides - [Cattle Feed Storage: Preventing Spoilage and Loss](/knowledge/animal-farming/beef-cattle/cattle-feed-storage-preventing-spoilage-and-loss) This section will be populated with links to related farming guides on beef cattle management, forage production, and feed storage topics. ## Related Clinical & Scientific Guides * [Cattle Head Gate Selection and Adjustment](/knowledge/animal-farming/beef-cattle/cattle-head-gate-selection-and-adjustment) * [Beef Cattle Handling Facility Flow](/knowledge/animal-farming/beef-cattle/beef-cattle-handling-facility-flow) * [Beef Cattle Maternity Pen Design: Comfort and Monitoring](/knowledge/animal-farming/beef-cattle/beef-cattle-maternity-pen-design-comfort-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.