# Feed Efficiency in Beef Cattle: Measuring and Improving ## Key Takeaways - Feed efficiency, measured by Feed Conversion Ratio (FCR) or Residual Feed Intake (RFI), directly impacts profitability by quantifying how effectively cattle convert feed into body weight gain. FCR is a simple ratio, while RFI accounts for maintenance and body size differences, making it more precise for genetic selection. - Genetics play a significant role, with feed efficiency being moderately heritable; selecting for superior efficiency traits through EPDs or related traits like average daily gain can lead to long-term herd improvement. - Nutritional management, including precise diet formulation with balanced energy, protein, minerals, and vitamins, alongside appropriate feed processing and bunk management, is crucial for optimizing digestion and nutrient utilization. - Maintaining animal health and comfort is paramount, as sick or stressed cattle divert energy from growth to immune responses or stress mitigation, thereby reducing feed efficiency and increasing maintenance requirements. - Comprehensive recordkeeping, including tracking feed intake, weights, and health events by group, is essential for accurately measuring feed efficiency and evaluating the impact of genetic, nutritional, and management interventions over time. --- Feed is the single largest variable cost in most cow-calf, stocker, and feedlot operations. For a commercial cattle operation, feed and forage can account for 50 to 70 percent of total production costs. That means small improvements in how cattle convert feed into body weight gain can have a direct and meaningful impact on the bottom line. This guide explains what feed efficiency is, how to measure it on your operation, and how to improve it through genetics, nutrition, management, and health practices. It is written for beef cattle producers, farm managers, and agricultural advisors who want practical, field-ready information. ## At a Glance | Takeaway | Why It Matters | How to Apply It | |---|---|---| | Feed efficiency measures how well cattle convert feed into gain | It is a direct driver of profitability | Calculate [feed conversion ratio](/knowledge/animal-farming/poultry/feed-conversion-ratio-measuring-improving-poultry-efficiency) or residual feed intake for your groups | | Feed conversion ratio (FCR) is the simplest measure | It is easy to compute but can be misleading across different cattle types | Use FCR for within-group comparisons, not across groups | | Residual feed intake (RFI) is a more precise measure | It accounts for maintenance and body size differences | Use RFI when selecting breeding stock or comparing animals fairly | | Genetics play a major role in efficiency | Some cattle are naturally more efficient than others | Select bulls and heifers with positive efficiency traits | | Diet formulation affects efficiency | Ration balance changes digestion and nutrient use | Work with a nutritionist to match rations to animal class and stage | | Health and comfort are part of efficiency | Sick or stressed cattle waste feed energy | Keep vaccination, parasite control, and handling low-stress | | Recordkeeping is essential | You cannot improve what you do not measure | Track feed intake, weights, and health events by group | | Feed efficiency is a herd trait, not a single-animal trait | Profitability comes from the group average | Focus on group-level improvements over time | ## Understanding Beef Cattle Feed Efficiency Feed efficiency in beef cattle is the relationship between the amount of feed an animal consumes and the production output it delivers, usually measured as body weight gain. A more efficient animal produces the same amount of gain while eating less feed, or produces more gain while eating the same amount. This trait matters because feed costs dominate the expense side of cattle production. There are two main ways to think about feed efficiency. The first is a simple ratio of feed consumed to weight gained, called the feed conversion ratio. The second is a more complex calculation called residual feed intake, which compares an animal's actual feed intake to its expected intake based on body size and growth rate. Both measures have a place in commercial cattle management. Feed efficiency is moderately heritable, which means you can make genetic progress through selection. It also responds to nutritional management, health protocols, and environmental conditions. A comprehensive approach that combines genetics, nutrition, and management will produce the best results. The economic value of improved feed efficiency goes beyond feed cost. More efficient cattle produce less manure per unit of gain, which can reduce nutrient management costs. They also tend to have a lower environmental footprint because they require fewer inputs to produce the same amount of beef. For producers selling on grid or value-based pricing, efficiency can indirectly affect carcass quality when paired with proper management. ## The Biology Behind Feed Efficiency To improve feed efficiency, you need to understand the underlying biology. Cattle use energy from feed for several purposes. The largest portion goes to maintenance, which is the energy required to keep the animal alive and functioning at rest. Maintenance includes energy for breathing, blood circulation, body temperature regulation, and basic cellular processes. The next portion goes to growth, which includes muscle and fat deposition. A smaller portion goes to activity, digestion, and waste. Individual animals differ in how they partition energy among these uses. Some cattle have lower maintenance requirements than others. Some are better at digesting fibrous feeds. Some deposit more muscle and less fat for the same amount of feed. These differences are partly genetic and partly environmental. The digestive system of cattle is a complex fermentation vat. The rumen contains billions of bacteria, protozoa, and fungi that break down plant material into volatile fatty acids, which the animal then uses for energy. The efficiency of this [fermentation process](/knowledge/molecular-biology/fermentation-process) varies among animals and is influenced by diet composition, feeding frequency, and the health of the rumen microbial population. Feed processing also affects efficiency. Grinding, rolling, or pelleting grains increases their digestibility. Processing forages can improve intake and reduce waste. However, over-processing can cause digestive upsets, which reduce efficiency. The goal is to match processing methods to the feed type and the class of cattle being fed. ## Measuring Feed Conversion Ratio The feed conversion ratio is the simplest and most widely used measure of feed efficiency. It is calculated by dividing the total feed consumed by the total weight gained over a specific period. For example, if a group of steers eats 1,200 pounds of feed and gains 400 pounds, the feed conversion ratio is 3.0, meaning it took 3 pounds of feed to produce 1 pound of gain. To calculate FCR accurately, you need two pieces of data: total feed intake and total weight gain. Feed intake should be measured on a dry matter basis to account for differences in moisture content between feeds. Weight gain is the difference between starting weight and ending weight, adjusted for shrink and fill. FCR is most useful for comparing animals within a single group that are the same age, sex, and body type. It is less useful for comparing across groups because larger animals have higher maintenance requirements and different growth patterns. A calf with a lower FCR is not necessarily more efficient than a calf with a higher FCR if the two calves differ in mature size or body composition. When using FCR, remember that it is a ratio. Ratios can be misleading because a change in the denominator, which is gain, changes the ratio even if feed intake stays the same. For example, an animal that gains more weight on the same feed intake will have a lower FCR, which looks better. But that animal might also be depositing more fat, which is not always desirable. ## Measuring Residual Feed Intake Residual feed intake is a more sophisticated measure of feed efficiency. It is calculated by comparing an animal's actual feed intake to its expected feed intake based on its body weight and growth rate. The expected intake is determined using a regression equation that accounts for the average relationship between body size, growth, and feed intake in the reference population. An animal that eats less than expected for its size and growth rate has a negative RFI and is considered efficient. An animal that eats more than expected has a positive RFI and is considered inefficient. RFI is expressed in pounds or kilograms of feed per day. The advantage of RFI is that it is independent of body size and growth rate. This makes it a fairer comparison across animals of different sizes and growth patterns. RFI is also moderately heritable, with heritability estimates ranging from 0.26 to 0.46 in most research populations. This means selection for low RFI can produce measurable genetic progress. The disadvantage of RFI is that it requires individual feed intake measurements, which are expensive and labor intensive. Most commercial operations do not have the equipment to measure individual intake. For this reason, RFI is primarily used in seedstock operations and research settings. Commercial producers can benefit from RFI by purchasing bulls that have been evaluated for the trait. To measure RFI, animals are typically placed in individual pens or fed through electronic feeders that record intake for each animal. They are weighed at the beginning and end of a test period, which usually lasts 70 to 84 days. Body weight is measured periodically throughout the test to calculate average daily gain and metabolic body weight. ## How to Measure Feed Efficiency on Your Operation You do not need a research facility to start measuring feed efficiency. You can begin with simple group-level measurements and gradually add more precision as your operation allows. **Step 1: Define your measurement group.** Group cattle by age, sex, and body type. This reduces variation and makes comparisons more meaningful. For cow-calf operations, you might measure efficiency in replacement heifers. For stocker operations, you might measure efficiency in a group of steers on a growing ration. For feedlots, you might measure efficiency in a pen of cattle on a finishing ration. **Step 2: Weigh accurately.** Use a calibrated scale and weigh at the same time of day, preferably in the morning before feeding. Weigh cattle on two consecutive days at the start and end of the test period and average the weights to reduce fill variation. Make sure cattle have access to water but limit feed before weighing to reduce gut fill differences. **Step 3: Measure feed intake.** For group-level measurements, record the total amount of feed delivered to the group each day and subtract any feed that is left over or wasted. For individual measurements, you need electronic feeders or individual pens. Weigh feed samples regularly to determine dry matter content. **Step 4: Calculate average daily gain.** Subtract the starting weight from the ending weight and divide by the number of days on test. For example, if a group gains 350 pounds over 84 days, the average daily gain is 4.17 pounds per day. **Step 5: Calculate feed conversion ratio.** Divide total dry matter intake by total weight gain. For the example above, if the group consumed 1,100 pounds of dry matter, the FCR is 3.14. **Step 6: Track your data over time.** Record the results for each group and compare them across years. This will help you identify trends and evaluate the impact of management changes. Use a spreadsheet or a recordkeeping software to organize the data. **Step 7: Consider individual intake measurement for breeding stock.** If you are selecting replacement heifers or bulls, individual intake data allows you to calculate RFI and select for efficiency more accurately. Some bull test stations and breed associations offer RFI testing. You can also purchase or lease electronic feeding equipment. ## Genetic Selection for Feed Efficiency Genetics is the foundation of long-term improvement in feed efficiency. Because the trait is moderately heritable, selecting animals with superior efficiency genetics will shift the average of your herd over time. When selecting bulls, look for expected progeny differences (EPDs) related to feed efficiency if they are available from your breed association. Some breeds publish a residual feed intake EPD or a feed conversion EPD. These values allow you to compare bulls within a breed for their genetic merit for efficiency. If feed efficiency EPDs are not available, you can use related traits. Average daily gain EPDs and milk EPDs are related to efficiency because they influence maintenance requirements and growth patterns. Carcass weight EPDs can also be relevant because heavier carcasses can improve efficiency per pound of product. For replacement heifers, selection pressure is usually lighter because most heifers are kept for reproductive purposes. However, you can still use efficiency information when selecting which heifers to keep. Heifers that are efficient growers without excessive fat deposition are good candidates for the breeding herd. Crossbreeding can also improve feed efficiency through heterosis. Crossbred cattle often have lower mortality, better health, and improved growth compared to straightbred cattle. The hybrid vigor effect on efficiency is indirect but real. A well-designed crossbreeding system that matches breeds to your environment and market can improve overall herd efficiency. ## Nutritional Management for Better Feed Efficiency Nutrition is the fastest way to influence feed efficiency in the short term. A properly balanced ration ensures that cattle have the nutrients they need without excess. Both deficiencies and excesses reduce efficiency. **Energy is the primary driver of gain.** Cattle need adequate energy to grow, but too much energy can lead to excessive fat deposition, which is less efficient than muscle growth. Match energy density to the stage of production. Growing cattle need a ration that supports frame and muscle development. Finishing cattle need a higher energy ration to deposit marbling and finish. **Protein must be balanced with energy.** Too little protein limits rumen fermentation and reduces feed intake. Too much protein is wasted because the excess nitrogen is excreted. Work with a nutritionist to match protein levels to the forage or grain base of your ration. **Minerals and vitamins matter more than many producers realize.** A deficiency in any essential mineral can reduce feed intake, immune function, and growth. Have your forage tested and supplement minerals accordingly. Pay special attention to calcium, phosphorus, magnesium, copper, zinc, and selenium in most regions. **Feed processing affects digestibility.** Crack or roll grain to improve starch digestibility. Process forages to reduce waste and improve intake. But avoid over-processing, which can cause acidosis and founder. Match processing intensity to the class of cattle and the type of feed. **Feed delivery and bunk management influence intake.** Cattle that have constant access to fresh feed eat more consistently and waste less. Feed at the same time each day and adjust the amount so that the bunk is empty or nearly empty at the next feeding. This is called slick bunk management and it reduces waste and maintains intake consistency. **Forage quality is a major factor in cow-calf efficiency.** Mature, low-quality forage requires more energy to digest than it provides. Cut hay at the right stage of maturity and test it for nutrient content. Supplement low-quality forage with protein and energy as needed to maintain cow body condition. ## Ration Formulation for Different Classes of Cattle Different classes of cattle have different nutrient requirements, and matching the ration to the animal is essential for efficiency. **Growing calves** need a ration that supports frame growth and muscle development without excessive fat deposition. A typical growing ration might contain 60 to 70 percent forage and 30 to 40 percent concentrate. The protein level should be 12 to 14 percent on a dry matter basis. The goal is a steady gain of 1.5 to 2.5 pounds per day depending on the target weight and frame size. **Finishing cattle** need a high-energy ration to deposit marbling and achieve a desirable carcass weight. A typical finishing ration contains 80 to 90 percent concentrate and 10 to 20 percent forage. The protein level is usually 12 to 13 percent. The ration is introduced gradually over 2 to 3 weeks to allow the rumen to adapt to the high starch load. **Cows in mid-gestation** have relatively low nutrient requirements. A good quality forage can meet most of their needs. The key is to maintain body condition and avoid excessive weight loss. Cows should be in body condition score 5 at calving for optimal rebreeding. **Cows in late gestation and early lactation** have the highest nutrient requirements. The last trimester is when the fetus is growing rapidly and the cow is building energy reserves for lactation. After calving, the cow needs extra energy and protein to support milk production and rebreeding. A common practice is to supplement cows with 2 to 4 pounds of grain or a protein supplement during this period. **Replacement heifers** need a ration that supports growth to reach 60 to 65 percent of mature body weight by their first breeding season. This usually means a gain of 1 to 1.5 pounds per day. Overfeeding heifers can lead to excessive fat in the udder and reduced lifetime productivity. ## Feed Additives and Technologies Several feed additives and technologies can improve feed efficiency in beef cattle. These products work through different mechanisms, and their effectiveness depends on the diet and the class of cattle. **Ionophores** are the most widely used feed efficiency additive. Compounds like monensin and lasalocid alter the rumen microbial population to favor propionate production over acetate and methane. This improves energy efficiency and reduces feed intake slightly while maintaining gain. Ionophores are approved for use in confined cattle and are commonly included in feedlot rations and some stocker supplements. **Beta-agonists** are feed additives that repartition nutrients toward muscle growth and away from fat deposition. They are fed during the last 20 to 40 days of the finishing period. Beta-agonists can improve average daily gain and feed efficiency by 10 to 20 percent. They require careful handling and withdrawal periods are mandatory. **Yeast and direct-fed microbials** can improve rumen function and fiber digestion. They are most beneficial in high-forage diets or during periods of stress. Research results are variable, but many producers find them cost-effective in specific situations. **Enzymes** that break down fiber can improve the digestibility of low-quality forages. They are sometimes used in stocker and cow-calf operations where forage quality is a limiting factor. The results depend on the forage type and the enzyme product. **Implant technology** has been used for decades to improve growth and efficiency in growing and finishing cattle. Implants release hormones that increase protein deposition and reduce fat deposition. They can improve average daily gain by 10 to 15 percent and feed efficiency by 5 to 10 percent. Implants are regulated by the FDA and require proper placement and withdrawal times. **Rumen-protected amino acids** can improve efficiency when the diet is deficient in a specific amino acid. Methionine and lysine are the most commonly supplemented. These products are more expensive and are usually only cost-effective in high-performance rations. Work with your veterinarian or nutritionist to determine which additives are appropriate for your operation. Consider the cost of the product relative to the expected improvement in efficiency. Keep accurate records to evaluate the response on your farm. ## Health and Comfort: The Hidden Drivers of Feed Efficiency A sick animal cannot be feed efficient. Disease diverts energy away from growth and toward the immune response. Even a mild infection can reduce feed intake and increase maintenance requirements. Keeping cattle healthy is one of the most effective ways to maintain feed efficiency. **Vaccination programs** should be tailored to your operation and region. Work with your veterinarian to develop a program that addresses the diseases most common in your area. Common vaccines include those for bovine respiratory disease, clostridial diseases, and viral diseases like IBR, BVD, and PI3. **Parasite control** is essential for feed efficiency. Internal parasites, especially worms, damage the gut lining and reduce nutrient absorption. External parasites like flies and lice cause stress and reduce feed intake. Develop a strategic deworming program based on fecal egg counts and seasonal patterns. Use pour-on or injectable products as recommended by your veterinarian. **Stress management** is often overlooked but has a significant impact on efficiency. Transport, handling, weaning, and weather extremes all cause stress that reduces feed intake and gain. Low-stress handling techniques, proper facility design, and gradual weaning can reduce stress and improve efficiency. **Bovine respiratory disease (BRD)** is the most costly disease in the feedlot industry. It reduces gain, increases feed conversion ratio, and can lead to chronic poor performance. Early detection and treatment are critical. Work with your veterinarian to develop a treatment protocol and track treatment rates by pen. **Lameness** is another major cause of reduced feed efficiency. Cattle that are lame spend less time at the bunk and eat less. Foot rot, laminitis, and other hoof problems should be treated promptly. Good pen drainage, clean bedding, and proper hoof care can prevent many lameness issues. **Heat stress** reduces feed intake and increases maintenance requirements. Provide shade, fresh water, and good ventilation in the summer months. Consider feeding a larger portion of the ration during the cooler evening hours. In extreme heat, sprinklers or misters can help cattle dissipate heat. ## Feeding Management and Bunk Management How you deliver feed is as important as what you feed. Good bunk management ensures that cattle have consistent access to feed without waste or digestive upset. The goal of bunk management is to have the bunk empty or nearly empty at the time of the next feeding. This is called slick bunk management. It ensures that cattle are eating all that they need without leaving stale or spoiled feed. Slick bunks also reduce the risk of acidosis because cattle cannot sort or overeat. Start with a known amount of feed and adjust based on what the cattle consume. Increase the feed amount by 5 to 10 percent if the bunk is clean early. Decrease the amount if feed is left over. Pay attention to the weather. Cattle eat less during hot weather and more during cold weather. Feed at the same time each day. Consistent feeding times create a routine that reduces stress and encourages intake. Many operations feed twice a day, which can improve intake and reduce feed waste compared to once-a-day feeding. Feed delivery should be even and consistent. Use a mixer wagon to ensure that the ration is thoroughly mixed and each bite is similar. Check the mixer for wear and calibration regularly. A poorly mixed ration can cause sorting and inconsistent nutrient intake. Water is the most important nutrient. Cattle need access to clean, fresh water at all times. Check water tanks daily and clean them regularly. In the summer, water intake increases dramatically and inadequate water reduces feed intake and gain. ## Forage Management for Cow-Calf Operations For cow-calf operations, forage is the base of the diet and the primary driver of feed efficiency. Managing forage quality and quantity is the most important thing you can do to improve efficiency in a cow herd. **Soil testing and fertilization** are the foundation of forage production. Test your soil every 2 to 3 years and apply lime, nitrogen, phosphorus, and potassium as needed. Healthy pastures and hayfields produce more forage with better nutrient content. **Grazing management** affects both forage quality and quantity. Rotational grazing allows plants to recover between grazings and maintains forage quality. Continuous grazing leads to overgrazing of preferred plants and undergrazing of less palatable species. A simple rotational system with multiple paddocks can improve forage utilization by 20 to 30 percent. **Hay quality** depends on the stage of maturity at harvest. Cut hay before it becomes too mature and fibrous. Legume-grass mixtures generally have better quality than grass-only hay. Test your hay and supplement as needed to meet cow requirements. **Stockpiling** is a management practice that allows you to graze forage into the winter instead of feeding hay. This can reduce feed costs and improve efficiency. Fence off a portion of pasture in late summer and allow it to accumulate growth for winter grazing. **Fall and winter feeding** is the most expensive part of the cow-calf year. Match cow body condition to the available forage. Cows that enter winter in good condition can be fed a lower quality diet. Cows that are thin need extra energy and protein to regain condition. **Cull cows that do not breed or wean a heavy calf.** A cow that does not produce a calf every year is a major drain on efficiency. Pregnancy diagnosis and culling open cows is one of the most effective ways to improve herd efficiency. ## Common Mistakes That Reduce Feed Efficiency Many producers unknowingly reduce feed efficiency through common management errors. Avoiding these mistakes can improve your bottom line without major changes. **Not weighing feed.** Guessing how much feed is delivered leads to overfeeding or underfeeding. Weigh feed at least weekly and adjust as needed. A simple scale on the mixer wagon or a weigh cell on the feed truck is a worthwhile investment. **Not testing feed.** Forage and grain vary in nutrient content. Without a feed test, you are balancing rations on guesses. Send samples to a commercial forage testing lab and use the results to formulate rations. **Overcrowding the bunk.** Cattle that cannot access the bunk when they want to eat will not achieve their intake potential. Provide at least 9 to 12 inches of bunk space per animal for finishing cattle and more for larger cattle. **Sorting by weight only.** Cattle that are sorted by weight can still differ in body composition and growth potential. Consider sorting by frame size and body condition as well as weight. **Ignoring the weather.** Cattle eat more in cold weather and less in hot weather. Adjust feed amounts and ration formulations accordingly. Provide windbreaks in winter and shade in summer. **Treating all cattle the same.** A single ration for all cattle in a group is rarely optimal. Group cattle by age, sex, and stage of production and formulate rations for each group. **Forgetting about shrink.** Shrink is the weight loss that occurs during transport and handling. It can be 3 to 8 percent of body weight. Minimize shrink by reducing handling time and providing water after transport. **Not keeping records.** Without records, you cannot know if your management changes are working. Keep simple records of feed purchases, weights, health events, and culling decisions. ## Decision Thresholds: When to Make a Change Knowing when to change a feeding program or management practice is as important as knowing how to change it. Use these thresholds as a starting point for your operation. **Feed conversion ratio above 6.5 in growing cattle.** If your growing cattle are taking more than 6.5 pounds of feed per pound of gain, evaluate your ration, health program, and genetics. This threshold is a rough guide and will vary by breed, age, and stage of production. **Average daily gain below 2.0 pounds per day in growing cattle.** If your growing cattle are gaining less than 2 pounds per day, the ration may be deficient in energy or protein. Weigh cattle regularly to track gain. **Bunk score consistently below 1 on a 4-point scale.** If feed is always left over, reduce the amount offered. If the bunk is empty more than 2 hours before the next feeding, increase the amount. **Body condition score below 4 in cows at weaning.** Cows that are too thin at weaning will have difficulty rebreeding. Increase energy and protein supplementation in late gestation and early lactation. **Treatment rate for BRD above 10 percent.** If more than 10 percent of a group requires treatment for respiratory disease, evaluate your vaccination program, arrival management, and pen conditions. **Culling rate above 15 percent for reproductive failure.** If more than 15 percent of cows are culled for not breeding, evaluate your breeding season length, bull fertility, and cow nutrition. **Feed cost per pound of gain above $1.00.** This will vary with feed prices, but if your feed cost per pound of gain is consistently above $1.00, evaluate your ration and management. ## Monitoring and Recordkeeping Good recordkeeping is the backbone of feed efficiency improvement. You cannot make informed decisions without data. Start with a simple system and add detail as you become more comfortable. **Track feed purchases and usage.** Record the type, amount, and cost of all feed purchased. Also record the amount of home-grown feed used. This gives you the total feed cost for each group. **Record weights regularly.** Weigh cattle at key points: at arrival, at weaning, at the start and end of a feeding period, and at marketing. Use these weights to calculate average daily gain and feed conversion. **Record health events.** Note any animal that is treated for disease, the condition treated, the treatment used, and the outcome. Health events affect feed efficiency and should be tracked. **Record culling decisions.** Document why each animal was culled. This helps you identify patterns and make better culling decisions in the future. **Use a spreadsheet or software.** A simple spreadsheet can track feed, weights, and health data. Many commercial software programs are available that are designed for cattle operations. Choose one that fits your operation and use it consistently. **Review your records quarterly.** Set aside time every 3 months to review your records and identify trends. Are certain groups more efficient than others? Are there health problems that are reducing gain? Are feed costs rising? **Share records with your team.** If you have employees, make sure they understand the importance of accurate records. Assign responsibility for weighing, feeding, and recording to specific people. ## When to Call a Veterinarian or Extension Agent Feed efficiency problems are often a symptom of a deeper issue. Know when to call in a professional for help. **Call your veterinarian if you see signs of disease.** Sudden drops in feed intake, coughing, nasal discharge, diarrhea, lameness, or deaths are all reasons to call. Early diagnosis and treatment can prevent a disease outbreak that devastates feed efficiency. **Call your veterinarian if you suspect a nutritional deficiency.** Poor growth, rough hair coats, and reduced fertility can all be signs of mineral or vitamin deficiencies. Your veterinarian can run blood tests and help you develop a supplementation program. **Call your extension agent for help with ration formulation and forage testing.** Extension agents have access to resources and can help you interpret feed test results and develop balanced rations. Many extension services offer free or low-cost feed testing programs. **Call your extension agent for help with grazing management.** Rotational grazing, stockpiling, and forage selection are complex topics. Your local extension agent can help you develop a grazing plan that matches your land and cattle. **Call your nutritionist for complex ration formulation.** If you are feeding a high-concentrate ration or have cattle with special needs, a professional nutritionist can help you develop a ration that maximizes efficiency. **Call your breed association for help with genetic selection.** If you are selecting bulls for feed efficiency, your breed association can provide EPDs and other genetic information to guide your selection. ## Frequently Asked Questions **What is the difference between feed conversion ratio and residual feed intake?** Feed conversion ratio is the simple ratio of feed consumed to weight gained. It is easy to calculate but is influenced by body size and growth rate. Residual feed intake is the difference between an animal's actual feed intake and its expected intake based on body weight and growth rate. RFI is a fairer comparison across animals of different sizes and is more heritable, but it requires individual feed intake measurements. **How much can I improve feed efficiency through genetics?** Feed efficiency is moderately heritable, with heritability estimates for RFI ranging from 0.26 to 0.46. This means that selection can produce meaningful genetic progress, but it takes time. Most genetic improvement programs expect a 1 to 2 percent improvement per year in feed efficiency with consistent selection pressure. **Do ionophores really improve feed efficiency?** Yes, ionophores like monensin and lasalocid are well-documented to improve feed efficiency in confined cattle. They typically improve feed conversion by 3 to 5 percent and can reduce feed intake by 3 to 5 percent while maintaining gain. They are most effective in high-concentrate rations and are approved for use in feedlot cattle. **How often should I weigh cattle to measure feed efficiency?** For a standard feed efficiency test, weigh cattle at the start and end of the test period, which is usually 70 to 84 days. Weigh on two consecutive days at the start and end to reduce fill variation. For ongoing monitoring, weigh cattle at key points like weaning, arrival, and shipment. **Can I measure feed efficiency without individual feed intake equipment?** Yes, you can measure group-level feed efficiency by tracking total feed delivered to a group and total weight gain of the group. This gives you a feed conversion ratio for the group. To measure individual animal efficiency, you need electronic feeders or individual pens, which are more expensive and labor intensive. **What is the ideal feed conversion ratio for feedlot cattle?** A feed conversion ratio of 5.0 to 6.0 is typical for feedlot cattle on a high-concentrate ration. Better than 5.0 is excellent, and worse than 6.5 suggests a problem with the ration, health, or genetics. These numbers will vary with breed, frame size, and stage of finishing. **How does forage quality affect feed efficiency in cows?** Forage quality has a direct impact on cow efficiency. Low-quality forage is less digestible, so cows consume less and extract less energy from what they eat. This leads to lower body condition and reduced reproductive performance. Testing forage and supplementing as needed is the most cost-effective way to improve cow efficiency. **Should I select bulls for low residual feed intake?** If RFI EPDs are available for your breed, selecting bulls with low or negative RFI is a good strategy for improving feed efficiency. These bulls will produce calves that eat less for the same growth rate. However, RFI should not be the only trait you select for. Balance efficiency with growth, maternal, and carcass traits. ## Related Farming Guides This section will be populated with links to related farming guides on cattle nutrition, herd health, grazing management, and other relevant topics. ## Related Clinical & Scientific Guides * [Animal Welfare Audits: Building a Useful Farm Program](/knowledge/animal-farming/farm-management/animal-welfare-audits-building-a-useful-farm-program) * [Total Mixed Ration (TMR) for Dairy: Mixing and Feeding Management](/knowledge/animal-farming/farm-management/total-mixed-ration-dairy-mixing-feeding) * [Feed Additives for Livestock: Probiotics, Enzymes, and More](/knowledge/animal-farming/farm-management/feed-additives-livestock-probiotics-enzymes) ## References - [USDA Farm Management](https://www.farmers.gov/) - [FAO Farm Management](https://www.fao.org/farmer-field-schools/en/) - [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.