# Calf Milk Replacer Selection: Ingredients, Quality, and Cost ## Key Takeaways - For standard calf feeding programs, select milk replacers with 20-22% crude protein and 20-22% crude fat; opt for 26-28% protein for accelerated growth programs aiming to double birth weight by weaning. - Prioritize milk replacers where at least 80% of the protein is milk-derived (e.g., dried whey, skim milk) for superior digestibility and amino acid profiles essential for lean tissue growth, especially in calves under three weeks of age. - A crude fiber content above 0.5% in milk replacer indicates poor ingredient quality and potential for reduced digestibility and slower growth rates. - Calculate the true economic value by determining the cost per pound of calf gain, rather than the cost per bag, as cheaper products may lead to slower growth and higher long-term expenses. - Ensure accurate mixing by adhering to manufacturer recommendations (typically 120-150 grams per liter of water) and feeding at 100-105°F to optimize protein digestion and prevent abomasal bloat. - Monitor fecal scores daily, as scours in the first two weeks are frequently nutrition-related, and maintain detailed records of birth weight, daily gain, and fecal scores to evaluate milk replacer efficacy. --- Choosing the right milk replacer for your dairy calves is one of the most consequential decisions you will make for your herd's future. The product you feed in the first eight weeks of life shapes growth rates, health status, and lifetime milk production. This guide compares milk replacer options by ingredient quality, protein and fat content, mixing and feeding protocols, and true cost per pound of gain. It is written for dairy producers, calf raisers, and farm managers who want a practical framework for selecting a product that fits their operation's goals and budget. ## At a Glance - Feed a milk replacer with 20 to 22 percent protein and 20 to 22 percent fat for standard feeding programs. Choose higher protein (26 to 28 percent) for accelerated growth programs. - Look for protein sources that are at least 80 percent milk-derived. All-milk protein supports better digestion and growth than vegetable proteins. - Avoid replacers with crude fiber above 0.5 percent. Higher fiber indicates poor ingredient quality. - Calculate cost per pound of gain, not cost per bag. A cheaper bag that produces slower gains is usually more expensive in the long run. - Mix at the manufacturer's recommended rate, typically 120 to 150 grams per liter of water. Do not guess at concentrations. - Feed at 100 to 105 degrees Fahrenheit. Water that is too hot destroys protein, and water that is too cold slows digestion. - Transition calves over 3 to 5 days when switching milk replacer brands. Sudden changes cause digestive upset. - Monitor fecal scores daily. Scours in the first two weeks are often nutrition-related, not infectious. - Keep a written record of birth weight, daily gain, and fecal scores for every calf. Use these records to evaluate whether your milk replacer choice is working. ## Understanding Calf Milk Replacer Ingredients The ingredient list on a milk replacer bag tells you most of what you need to know about product quality. Milk replacers are designed to imitate the nutritional profile of whole milk, but the raw materials used to achieve that profile vary widely between brands and price points. ### Milk-Derived Protein Sources Dried whey and dried skim milk are the gold standard protein sources in calf milk replacers. These ingredients come from the cheese and butter industries and retain the natural [protein structure](/knowledge/bioinformatics/protein-structure-biophysical-levels-folding) that calves digest efficiently. Milk-derived proteins contain a high level of lysine and methionine, the amino acids that drive lean tissue growth in young calves. Dried whey protein concentrate is the most common milk-based protein used in modern calf milk replacers. It provides a balanced amino acid profile and is highly digestible. Skim milk powder is also used in premium products, especially those marketed for calves under three weeks of age. Both ingredients supply lactose, which is the primary energy source in a calf's diet. ### Alternative Protein Sources Many economical milk replacers substitute vegetable proteins for a portion of the milk protein. The most common alternatives are soy protein concentrate, wheat gluten, and pea protein. These ingredients are less expensive than milk proteins, which lowers the bag price. However, they come with trade-offs. Soy protein concentrate can cause a hypersensitive reaction in young calves when fed at high levels. This reaction appears as diarrhea and poor growth, and it can be mistaken for an infectious disease outbreak. Calves under three weeks of age are especially vulnerable. Some research suggests that calves can develop tolerance to soy protein over time, but the early weeks are critical for gut development and immune function. Wheat gluten is another economical protein source, but it has a less favorable amino acid profile than milk protein. It is often lower in lysine, which limits growth potential. Pea protein is a newer option that shows moderate digestibility, but it is less studied than soy or wheat. Your decision on protein sources should be guided by the age of the calves you are feeding. If you are raising newborn calves from day one, choose a product with at least 80 percent milk-derived protein. If you are feeding older calves that have already developed a functioning rumen, a higher vegetable protein content may be acceptable, but it is still not ideal. ### Fat Sources Fat is the second major energy component in milk replacers. The fat in whole milk is butterfat, which is expensive. Milk replacer manufacturers use alternative fat sources that are stabilized for mixing and digestion. Lard and tallow are animal fats that have been used in milk replacers for decades. They are highly digestible and provide good energy density. Palm oil and coconut oil are common vegetable fat alternatives. These are less expensive but may be less digestible for young calves. The physical form of the fat matters as much as the source. Fat must be homogenized into tiny droplets so it stays suspended in the liquid. Poorly processed fat separates and floats to the top of the bottle or bucket. This reduces the fat the calf actually consumes and can cause digestive upset. Look for milk replacers that use a blend of animal and vegetable fats. This approach balances cost with digestibility. Avoid products that use only vegetable fats, especially for calves under two weeks of age. ### Carbohydrates and Fiber Lactose is the primary carbohydrate in milk replacers. It comes from whey and provides quick energy for growth. Some manufacturers add starch as a cheaper carbohydrate source. Starch is less digestible for young calves and can contribute to loose stools. Crude fiber is a quality marker in milk replacers. Fiber is indigestible for calves and adds bulk without nutritional value. High-quality milk replacers have less than 0.5 percent crude fiber. If you see a fiber level above 1 percent, the product likely contains low-quality fillers that will reduce digestibility and slow growth. ### Additives and Supplements Most milk replacers include a vitamin and mineral premix to meet the calf's nutritional requirements. Beyond that, manufacturers add various functional ingredients that can influence calf health and performance. Probiotics and direct-fed microbials are common additives. These are designed to support a healthy gut microbiome and reduce the risk of scours. Mannan-oligosaccharides and fructo-oligosaccharides are prebiotics that feed beneficial bacteria in the gut. Some products include organic acids or essential oils that may have antimicrobial properties. Medicated milk replacers contain coccidiostats such as decoquinate or lasalocid. These products help prevent coccidiosis, a common parasitic disease in calves. If you have a history of coccidiosis on your farm, a medicated milk replacer may be a good preventive choice. However, medicated products are not a substitute for good sanitation and management. Antibiotic additives such as oxytetracycline and neomycin were once common in milk replacers. Their use is now more restricted due to concerns about antimicrobial resistance. Some countries have banned or limited these additives. Check your local regulations before choosing a product with antibiotics. ## Milk Replacer Protein Levels Protein is the most expensive component in a milk replacer, and it is the nutrient that most directly influences growth. The protein level you choose should match your feeding goals and management capacity. ### Standard Protein Levels Traditional milk replacers contain 20 to 22 percent crude protein. This level supports moderate growth when calves are fed at standard rates. A calf consuming 1.5 pounds of milk replacer powder per day at 20 percent protein receives 0.3 pounds of protein daily. This is sufficient for maintenance and modest gain, but it does not maximize growth potential. The National Research Council's nutrient requirements for dairy cattle suggest a crude protein level of 22 to 24 percent for milk replacer. Many commercial products fall in this range. If you are feeding a simple program with limited labor, a 20 to 22 percent protein product is a reasonable choice. ### Accelerated Protein Levels Accelerated growth programs use milk replacers with 26 to 28 percent crude protein. These programs involve feeding larger volumes of liquid and are designed to double or triple the calf's birth weight by weaning. Calves on accelerated programs gain 1.5 to 2.2 pounds per day compared to 0.8 to 1.2 pounds on standard programs. Higher protein levels support more lean tissue deposition. This is important because calves that grow faster in the preweaning period produce more milk in their first lactation. Research from multiple university programs has shown that every pound of average daily gain before weaning adds hundreds of pounds to first-lactation milk production. Accelerated programs require more careful management. You must monitor calves closely for digestive upset and adjust feeding rates based on individual calf condition. A calf that is scouring does not need more milk, it needs appropriate treatment and possibly a temporary reduction in feeding volume. ### Matching Protein to Your Goals Your choice of protein level depends on several factors: - Replacement heifer needs. If you are raising your own replacements and want them to calve at 24 months, accelerated growth helps you achieve that target. - Milk price and feed cost. Higher protein products cost more per bag. The additional growth must pay for itself through earlier calving or higher lactation performance. - Labor availability. Accelerated programs need more attention to calf health and feeding consistency. - Facilities. Calves on accelerated programs may outgrow individual hutches or pens sooner, requiring more space. A practical approach is to start all calves on a 22 percent protein product and switch to a 26 percent product for calves that are thriving and growing well. This allows you to capture the benefits of accelerated growth without the risk of overfeeding less vigorous calves. ## Milk Replacer Fat Content Fat provides energy density in milk replacer and supports the development of a healthy coat and body condition. The fat level you choose affects growth rate, feed efficiency, and the cost of the product. ### Standard Fat Levels Most milk replacers contain 20 to 22 percent fat. This level matches the energy density of whole milk and supports normal growth. Calves need fat for insulation, cell membrane structure, and absorption of fat-soluble vitamins. A 20 percent fat product provides about 22 percent of the calf's daily energy from fat when fed at standard rates. This is adequate for maintenance and moderate growth in most environmental conditions. ### High-Fat Products Some milk replacers contain 24 to 28 percent fat. These products are designed for calves under cold stress or calves that need extra energy for rapid gain. High-fat products are also used in show calf programs where a sleek, healthy coat is desirable. During cold weather, calves burn more energy to maintain body temperature. Increasing the fat content of the milk replacer provides extra calories without increasing the volume of liquid the calf must consume. This is more practical than feeding larger volumes of a standard product. ### Fat and Protein Balance The ratio of fat to protein in a milk replacer influences where the calf's energy comes from. A product with equal protein and fat levels (20/20 or 22/22) provides a balanced supply of nutrients for growth and maintenance. Products with higher fat relative to protein (22/20 or 24/20) encourage fat deposition rather than lean growth. This can produce a calf that looks good but has not developed the skeletal and muscle structure needed for high milk production. For dairy heifers, prioritize protein over fat. Products with higher protein relative to fat (26/20 or 28/20) support lean growth and are appropriate for accelerated programs. The lower fat level is fine in mild weather but may need adjustment during cold stress. ### Practical Fat Recommendations For most dairy operations, a 20/20 or 22/20 product is the right choice. This provides balanced nutrition at a reasonable cost. In cold climates or during winter months, switch to a product with 22 to 24 percent fat or add a supplemental fat source to the milk replacer. Avoid products with fat levels above 28 percent. These are expensive and can cause digestive upset. Calves have a limited capacity to digest fat, and excess fat passes through the gut undigested, contributing to loose stools. ## Cost Comparison and Economic Analysis The price tag on a bag of milk replacer is only the beginning of the cost story. To make a sound purchasing decision, you need to calculate the true cost per pound of calf gain and compare that across products. ### Cost Per Bag Versus Cost Per Pound of Gain A 50-pound bag of milk replacer might cost $45 for an economy brand and $70 for a premium brand. The economy brand seems cheaper by $25 per bag. But if the economy brand produces 0.8 pounds of daily gain and the premium brand produces 1.2 pounds, the economics change. Assume both products are fed at the same rate of 1.5 pounds of powder per calf per day. One bag feeds one calf for about 33 days. The economy brand produces 26.4 pounds of gain per bag. The premium brand produces 39.6 pounds of gain per bag. The cost per pound of gain is $1.70 for the economy brand and $1.77 for the premium brand. The difference is small. When you factor in the value of earlier weaning, reduced veterinary costs, and higher future milk production, the premium product is often the better investment. ### Calculating Your Own Cost Comparison To compare products on your farm, use this simple formula: 1. Determine the feeding rate in pounds of powder per calf per day. This is on the label. 2. Divide the bag price by the bag weight to get cost per pound of powder. 3. Multiply cost per pound by the daily feeding rate to get daily feed cost. 4. Estimate daily gain based on the product's protein level and your feeding program. Use 1.0 pounds for 20 percent protein, 1.2 pounds for 22 percent, and 1.6 pounds for 26 percent if you are feeding an accelerated program. 5. Divide daily feed cost by daily gain to get cost per pound of gain. This calculation gives you a number that is comparable across products. It also helps you evaluate whether a more expensive product is worth the premium. ### Hidden Costs of Cheap Milk Replacers Low-cost milk replacers often have hidden costs that do not appear on the price tag: - Higher scour incidence. Poorly digestible ingredients cause diarrhea, which requires labor for treatment and increases the risk of dehydration and death. - Slower growth. Calves that gain slowly stay on milk longer, increasing the total cost of the feeding program. - Reduced immunity. Calves that are undernourished or stressed by digestive upset have weaker immune systems and are more susceptible to respiratory disease. - Lower future production. The growth deficit from poor early nutrition is never fully recovered. A cheap bag of milk replacer can easily cost you hundreds of dollars per calf in lost production and increased veterinary expenses. ### Buying in Bulk If you have a consistent calf crop and adequate storage, buying milk replacer in bulk can reduce the cost per bag by 5 to 15 percent. Many feed companies offer volume discounts for pallet or semi-load purchases. Some cooperatives and buying groups negotiate even better prices for their members. Bulk buying requires dry, rodent-proof storage. Milk replacer is highly palatable to rodents and spoils quickly when exposed to moisture. Store bags on pallets off the floor, keep them in a sealed room, and rotate stock so the oldest product is used first. ## Step-by-Step Guide to Selecting a Milk Replacer Follow this process when you are ready to evaluate and select a milk replacer for your operation. ### Step 1: Define Your Goals Write down what you want your calf program to achieve. Include target weaning weight, target average daily gain, target age at first calving, and acceptable mortality and morbidity rates. These numbers will guide your product selection. ### Step 2: Review Your Current Program Collect data on your current calf performance. Calculate average daily gain, scour incidence, mortality rate, and cost per calf. If you do not have this data, start collecting it now. You cannot evaluate a new product without a baseline. ### Step 3: Identify Candidate Products Ask your feed supplier for product specifications for the milk replacers they carry. You can also contact major manufacturers directly. Request the guaranteed analysis and ingredient list for each product. Compare these documents side by side. ### Step 4: Evaluate Ingredient Quality Review the ingredient list for each candidate product. Look for: - Milk-derived proteins listed first. The first ingredients are present in the highest amounts. - Crude fiber below 0.5 percent. - A fat source that includes animal fats or a blend of animal and vegetable fats. - No artificial colors or flavors. These add no nutritional value. - A vitamin and mineral premix that includes selenium and vitamin E for immune support. ### Step 5: Calculate Cost Per Pound of Gain Use the formula from the cost section to calculate the true cost of each product. Include the cost of any additional supplements you will need, such as electrolytes for calves that scour. ### Step 6: Run a Trial Before switching your entire calf crop to a new product, run a small trial. Select 10 to 20 calves of similar age and weight. Feed half the new product and half your current product. Track daily gain, fecal scores, and health treatments for three weeks. Compare the results before making a full switch. ### Step 7: Make the Switch If the trial results support a change, transition your calves over 3 to 5 days. Mix increasing amounts of the new product with decreasing amounts of the old product. Monitor calves closely for digestive upset during the transition. ## Mixing and Feeding Protocols The best milk replacer in the world will not perform well if it is mixed or fed incorrectly. Follow these protocols to get the most from your product. ### Water Quality and Temperature Use clean, potable water for mixing milk replacer. Water with high mineral content, especially iron or sulfur, can affect the taste and digestibility of the product. If your water has a strong odor or leaves stains, have it tested. Mix milk replacer at 120 to 130 degrees Fahrenheit. The powder dissolves better in warm water, and the final feeding temperature will be close to 100 to 105 degrees. Do not use boiling water, as it denatures protein and destroys vitamins. After mixing, check the temperature with a thermometer before feeding. Calves prefer milk at 100 to 105 degrees. Milk that is too cold slows digestion and can cause abomasal bloat. Milk that is too hot burns the calf's mouth and esophagus. ### Mixing Method Add the powder to the water, not the water to the powder. This prevents clumping. Use a whisk or a mechanical stirrer to mix thoroughly. The powder should be completely dissolved with no lumps or sediment. For large operations, an automatic milk feeding machine handles mixing and delivery. These machines need daily cleaning and calibration. Check the machine's output regularly to ensure calves are receiving the correct concentration. ### Feeding Rates The feeding rate on the label is a starting point. Adjust for calf size, environmental temperature, and health status. A standard program feeds 1.5 pounds of milk replacer powder per calf per day, divided into two feedings. This provides about 1.5 gallons of liquid per calf daily. An accelerated program feeds 2.0 to 2.5 pounds of powder per calf per day, divided into two or three feedings. This provides 2.0 to 2.5 gallons of liquid daily. Calves under cold stress need 25 to 50 percent more energy. Increase the feeding rate or switch to a higher-fat product during cold weather. ### Feeding Frequency Feeding calves twice daily at 12-hour intervals is standard. Some operations feed three times daily for the first two weeks, which more closely mimics natural suckling patterns and may improve digestion. If you feed once daily, you must use a higher concentration of powder to provide adequate nutrition. This is not recommended for calves under two weeks of age. Their digestive systems cannot handle a large, concentrated meal. ### Bottle Versus Bucket Feeding Bottle feeding with a nipple encourages natural sucking behavior and promotes the esophageal groove reflex, which directs milk to the abomasum. This is the preferred method for young calves. Bucket feeding is faster and requires less labor, but it increases the risk of milk entering the rumen before the esophageal groove is fully developed. This can cause digestive upset and reduce nutrient absorption. If you use bucket feeding, use a nipple bucket that requires the calf to suck. This provides the same benefits as bottle feeding with less labor. ## Common Mistakes in Milk Replacer Selection and Feeding Avoid these frequent errors that undermine calf performance and increase costs. ### Choosing Based on Price Alone The cheapest milk replacer is rarely the most economical choice. Low-cost products typically contain more vegetable protein and lower-quality fat, which reduces digestibility and growth. Calculate cost per pound of gain, not cost per bag. ### Ignoring the Ingredient List The guaranteed analysis tells you the protein and fat levels, but it does not tell you the quality of the ingredients. Two products can have identical protein levels, with one using all-milk protein and the other using 50 percent soy. Read the ingredient list and ask your supplier about the sources. ### Feeding the Wrong Concentration More is not better. Feeding a higher concentration than recommended can cause digestive upset and scours. Feeding a lower concentration deprives calves of nutrients and slows growth. Always mix to the manufacturer's recommended rate. ### Inconsistent Feeding Times Calves thrive on routine. Feed at the same times every day. Irregular feeding times cause stress and can contribute to digestive problems. ### Switching Products Abruptly A sudden change in milk replacer can cause scours and reduced intake. Always transition over 3 to 5 days by gradually increasing the proportion of the new product. ### Neglecting Equipment Cleaning Milk residue supports bacterial growth. Bottles, nipples, buckets, and mixing equipment must be cleaned and sanitized after every feeding. Dirty equipment is a major source of scour-causing pathogens. ### Overlooking Calf Temperature Calves that are chilled cannot digest milk properly. Provide a dry, draft-free environment with adequate bedding. In cold weather, consider a calf jacket for the first few weeks of life. ### Assuming All Scours Are Infectious Nutritional scours from poor-quality milk replacer or improper feeding are common. Before treating for infectious disease, review your mixing and feeding protocols. A calf that scours consistently at the same age may be reacting to the milk replacer. ## Decision Thresholds: When to Change Your Milk Replacer Use these thresholds to evaluate whether your current milk replacer is meeting your goals. ### Average Daily Gain Weigh calves at birth and at weaning. Calculate average daily gain by dividing total gain by days of age. If your calves are gaining less than 1.0 pound per day on a standard program, evaluate your milk replacer quality and feeding rates. If they are gaining less than 1.5 pounds per day on an accelerated program, the product may not be delivering the expected nutrient levels. ### Scour Incidence Track the percentage of calves that require scour treatment. A rate above 15 percent warrants investigation. If scours occur primarily in the first two weeks of life and are not associated with a specific pathogen, suspect nutritional causes. ### Weaning Weights Set a target weaning weight based on your breed and management goals. Holstein calves should double their birth weight by 56 days of age on an accelerated program. If calves are falling short, review your milk replacer selection. ### Mortality Rate A mortality rate above 5 percent in the preweaning period is a red flag. While mortality has many causes, poor nutrition is a common contributor. Review your entire calf program, starting with colostrum management and moving through milk feeding. ### Cost Per Calf Calculate the total cost of your milk feeding program per calf, including milk replacer, electrolytes, and labor. Compare this to the value of the weaned calf. If your costs are high and gains are low, a different product may be more economical. ## Monitoring and Recordkeeping You cannot manage what you do not measure. A simple recordkeeping system will help you evaluate your milk replacer program and make data-driven decisions. ### What to Record For every calf, record: - Birth date and birth weight - Colostrum feeding time and volume - Milk replacer brand and lot number - Daily feeding rate and amount consumed - Weekly weight - Fecal score (1 is firm, 2 is soft, 3 is runny, 4 is watery) - Any health treatments - Weaning date and weight ### How to Use the Records Review your records monthly. Calculate average daily gain by week of age. Look for patterns in scour incidence. Compare the performance of calves fed different milk replacer lots or brands. Share your records with your veterinarian or extension agent. They can help you interpret the data and identify problems before they become serious. ### Digital Tools Several smartphone apps and software programs are available for calf recordkeeping. These range from simple spreadsheet templates to comprehensive herd management systems. Choose a tool that is easy for your staff to use consistently. ### The Value of Weighing A scale is one of the most valuable investments you can make in your calf program. Weigh calves at birth, at 2 weeks, at 4 weeks, and at weaning. This data tells you whether your feeding program is working. If you cannot afford a scale, use a heart-girth tape to estimate weight. ## When to Call a Veterinarian or Extension Agent While many aspects of milk replacer selection are management decisions, certain situations warrant professional advice. ### Call Your Veterinarian If - Scour outbreaks affect more than 20 percent of calves and do not respond to standard treatment. - Calves show signs of respiratory disease, including coughing, nasal discharge, or fever. - Mortality exceeds 5 percent in the preweaning period. - You suspect a specific pathogen, such as rotavirus, coronavirus, or cryptosporidia. - Calves are not gaining weight despite adequate feed intake and no obvious health problems. - You need to design a vaccination program for your calves. Your veterinarian can run diagnostic tests to identify infectious causes of disease and recommend appropriate treatments. They can also help you evaluate whether your milk replacer program is contributing to health problems. ### Call Your Extension Agent If - You want to compare milk replacer products using unbiased research data. - You need help calculating the economics of different feeding programs. - You are considering a new feeding system, such as an automated milk feeder. - You want to design a trial to evaluate a new product on your farm. - You have questions about nutrient requirements for calves in your climate. Extension agents have access to university research and can provide objective information that is not tied to a specific product. They can also help you connect with other producers who have tried different products. ## Frequently Asked Questions ### How do I know if a milk replacer is high quality? Look at the ingredient list and guaranteed analysis. A high-quality milk replacer lists milk-derived proteins such as dried whey or skim milk as the first ingredients. Crude fiber should be below 0.5 percent. Protein should be 20 percent or higher and fat should be 20 percent or higher. Avoid products with soy protein concentrate as the primary protein source for calves under three weeks of age. ### What is the difference between a 20/20 and a 26/20 milk replacer? The first number is crude protein and the second is crude fat. A 20/20 product contains 20 percent protein and 20 percent fat. This supports moderate growth of about 1.0 pound per day. A 26/20 product contains 26 percent protein and 20 percent fat. This supports accelerated growth of 1.5 to 2.0 pounds per day when fed at higher volumes. The 26/20 product is more expensive but produces heavier calves at weaning. ### Can I feed a milk replacer with vegetable protein to young calves? You can, but it is not recommended for calves under three weeks of age. Vegetable proteins such as soy are less digestible than milk proteins and can cause digestive upset and allergic reactions. If you must use a product with vegetable protein, choose one with at least 80 percent milk-derived protein and introduce it gradually. Monitor calves closely for scours and reduced growth. ### How much milk replacer should I feed per day? Standard programs feed 1.5 pounds of powder per calf per day, divided into two feedings. Accelerated programs feed 2.0 to 2.5 pounds per day. The exact amount depends on the product's nutrient density, the calf's size, and environmental conditions. Always follow the manufacturer's recommendations and adjust based on calf condition and growth. ### Should I use a medicated milk replacer? Medicated milk replacers contain coccidiostats that help prevent coccidiosis. If you have a history of coccidiosis on your farm, a medicated product may be beneficial. However, medication is not a substitute for good sanitation. Clean and disinfect [calf housing](/knowledge/animal-farming/farm-management/calf-housing-hutches-pens-group-systems) between occupants, keep feed and water clean, and minimize stress. Talk to your veterinarian about whether a medicated product is appropriate for your situation. ### How long should I keep calves on milk replacer? Most calves are weaned between 6 and 10 weeks of age. The weaning age depends on the calf's weight, starter intake, and rumen development. Calves should be eating at least 2 pounds of starter grain per day for three consecutive days before weaning. Wean gradually over 7 to 10 days by reducing the amount of milk replacer fed. ### What temperature should milk replacer be when I feed it? Feed milk replacer at 100 to 105 degrees Fahrenheit. Mix the powder with water at 120 to 130 degrees so the final temperature is in the correct range. Use a thermometer to check the temperature before feeding. Milk that is too cold slows digestion and milk that is too hot can burn the calf. ### Can I feed waste milk instead of milk replacer? Waste milk from treated cows can be fed to calves, but it carries risks. Waste milk may contain antibiotic residues, pathogens, and inconsistent nutrient levels. Pasteurize waste milk before feeding to reduce disease risk. Compare the cost of pasteurizing waste milk to the cost of a high-quality milk replacer. In many cases, milk replacer is more consistent and safer. ## Related Farming Guides This section will be populated with links to related farming guides on calf nutrition, dairy herd management, and youngstock health. Check back for additional resources on colostrum management, starter feed selection, and weaning protocols. ## Related Clinical & Scientific Guides * [Evaluating Feed Additives for Dairy Cow Performance](/knowledge/animal-farming/dairy-cattle/evaluating-feed-additives-for-dairy-cow-performance) * [Dairy Barn Fire Safety: Design and Prevention Measures](/knowledge/animal-farming/dairy-cattle/dairy-barn-fire-safety-design-prevention) * [Dairy Cow Pregnancy Loss Records and Review](/knowledge/animal-farming/dairy-cattle/dairy-cow-pregnancy-loss-records-and-review) ## References - National Mastitis Council: https://www.nmconline.org/ - USDA APHIS Dairy Cattle Health: https://www.aphis.usda.gov/livestock-poultry-disease/cattle - FAO Dairy Production and Products: https://www.fao.org/dairy-production-products/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.