Raising calves successfully comes down to getting a few critical things right in the first hours, days, and weeks of life. The most important single factor is colostrum, the first milk, delivered within two hours of birth. From there, it’s a matter of consistent nutrition, clean housing, disease prevention, and knowing when the calf is ready to transition off milk. Here’s how to handle each stage.
Colostrum: The First and Most Critical Feeding
A calf’s ability to absorb protective antibodies from colostrum drops sharply after birth. Absorption is most efficient in the first four hours, declines steadily after six hours, and essentially shuts down by 24 hours as the gut wall closes. Your goal is to get colostrum into the calf within one to two hours of birth, and no later than six hours.
Feed 10% to 12% of the calf’s body weight in colostrum at that first feeding. For a typical 95-pound calf, that works out to about one gallon. If the calf won’t nurse from its dam, use a bottle or an esophageal tube feeder. Fresh colostrum from the calf’s mother is ideal, but frozen colostrum from a previous collection or a commercial colostrum replacer will work when fresh isn’t available. Quality matters: thick, golden-yellow colostrum is generally higher in antibodies than thin, watery colostrum.
Calves that miss this window or receive poor-quality colostrum are far more vulnerable to scours, pneumonia, and other infections in the weeks ahead. No amount of good management later fully compensates for a failed colostrum feeding.
Milk Feeding for the First Several Weeks
After colostrum, calves transition to whole milk or milk replacer, typically fed twice a day. If you’re using milk replacer, look for one with 20% to 22% protein and 20% fat. Higher-fat formulas are especially helpful in cold weather, when calves burn extra energy just staying warm. Milk-protein-based replacers (those listing whey or casein as the first ingredient) are generally better digested than plant-protein alternatives.
A common feeding rate is about two quarts per feeding, twice daily, though calves grow faster and transition to solid feed more easily when offered more milk. Research on pair-housed calves found that growth benefits appeared mainly when calves received at least 7 liters (roughly 7.5 quarts) of milk per day. Feeding more milk doesn’t make calves lazy about eating grain. It gives them the energy they need to grow while their rumen develops.
Introducing Starter Grain
Offer a small amount of calf starter grain beginning in the first week of life, even though the calf will barely touch it at first. The point is exposure. Calves need to eat dry feed to develop the rumen, the large fermentation chamber that will eventually let them digest forages like an adult cow. Without grain intake, the rumen stays undeveloped and weaning becomes stressful.
Choose a starter with 22% to 25% crude protein on a dry-matter basis. Keep it fresh by replacing uneaten grain daily, since stale or wet feed discourages intake. Hay is not necessary at this stage and can actually slow rumen development if calves fill up on it instead of grain. A small amount of good-quality hay can be introduced after weaning.
When and How to Wean
Grain intake, not age alone, should determine when a calf is ready to wean. The benchmark is at least 3 pounds of starter per day for three consecutive days. Don’t discontinue milk before six weeks of age regardless of grain consumption.
A healthy calf should double its birth weight by eight weeks. For dairy heifers, the target growth rate from two months onward is about 1.6 to 1.9 pounds per day. Growing heifers at roughly 1.75 pounds per day in this prepubertal period has been linked to the highest milk production later in life, so hitting this range matters for long-term productivity.
Gradual weaning, where you reduce milk feedings from twice daily to once daily for a week or so before stopping, is less stressful than abrupt cutoff. Watch for weight loss or slumping grain intake during the transition, which signal the calf wasn’t quite ready.
Housing and Environment
Calves are comfortable in their thermoneutral zone, which starts at about 50°F. Below that temperature, they burn extra calories to maintain body heat, so cold-weather management requires either more milk or higher-fat milk replacer.
Ventilation is the most underappreciated factor in calf housing. Ammonia, moisture, and airborne pathogens accumulate fast in enclosed barns. Indoor calf housing should provide at least four air exchanges per hour, even in cold weather. The instinct to seal up buildings when temperatures drop is understandable but counterproductive. Calves handle cold air far better than they handle stale, humid air. Outdoor hutches work well in most climates for exactly this reason: they provide shelter from wind and rain while keeping air fresh.
Bedding should be deep enough that the calf’s legs disappear when it lies down. Straw is the most common choice because it insulates well. Wet bedding chills calves quickly and breeds bacteria, so add fresh bedding regularly and clean pens between calves.
Pair Housing Improves Development
Raising calves in pairs or small groups rather than individual pens has clear developmental advantages. Paired calves show better social cognition, learn new tasks faster, and are less fearful of unfamiliar situations. They also tend to eat more starter grain through social facilitation, meaning one calf’s eating encourages the other to eat. Cattle are naturally wary of new feeds, and calves raised with a companion are quicker to try unfamiliar feedstuffs later in life.
Research consistently shows that pair housing does not compromise calf health or performance. In fact, paired calves often maintain growth advantages into the heifer period without any reduction in feed efficiency. If you’re raising calves individually out of concern for disease spread, pairing healthy calves of similar age is a worthwhile change to consider.
Preventing and Recognizing Scours
Diarrhea, commonly called scours, is the leading cause of death in young calves. The causes range from bacteria and viruses to parasites, but the treatment priority is the same regardless: replace lost fluids and electrolytes. A scouring calf can dehydrate dangerously fast.
Check hydration by pinching a fold of skin on the calf’s neck. If it snaps back quickly, the calf is reasonably hydrated. If the skin stays tented for a second or two, the calf has lost around 6% of its body weight in fluid. At that level, you’ll also notice a dry mouth and nose. An oral electrolyte solution given two to three times daily, 1 to 2 liters per feeding, is often enough to turn things around at this stage. Continue milk feedings alongside electrolytes rather than replacing milk with electrolytes, since the calf still needs the calories.
More severe signs include sunken eyes, cold legs and ears, and an unwillingness to stand. A calf showing these symptoms is 8% or more dehydrated and needs veterinary intervention with subcutaneous or intravenous fluids. A calf that becomes cold to the touch and unresponsive is in shock and may not survive without aggressive treatment.
Prevention starts with clean, dry housing, good colostrum management, and not overcrowding pens. Many producers also vaccinate cows before calving so that the dam’s colostrum carries antibodies against common scours-causing organisms.
Watching for Respiratory Disease
Pneumonia is the second major killer of young calves. Early signs include a faster breathing rate, fever, drooping ears (one or both), and a calf that seems dull or uninterested in feeding. These symptoms can progress quickly, so catching them early makes a real difference in outcomes.
The biggest environmental risk factors are poor ventilation, overcrowding, and extreme weather, particularly cold combined with rain or snow. Calves born during harsh weather conditions have higher mortality rates partly because cold stress delays their first nursing and compromises immune function. Mixing calves of different ages in the same airspace also increases respiratory disease risk, since older calves can shed pathogens that overwhelm younger calves’ immune systems.
Disbudding and Castration
If your calves will need to be dehorned, earlier is better. Disbudding, which destroys the horn bud before it attaches to the skull, is far less painful and heals faster than removing developed horns. It can be done as early as the first day of life using a heated iron or caustic paste. Caustic paste works best within the first two weeks. For dairy calves handled daily, disbudding should be completed by eight weeks. Beef calves in range operations should be done at the first practical opportunity, ideally before three months.
All disbudding and dehorning methods cause pain. Local anesthesia blocks the immediate pain for up to five hours, and anti-inflammatory medication extends pain relief for up to 48 hours. Using both together is now considered standard practice. The same principle applies to castration: younger animals recover faster, and pain management should always be part of the procedure.
Clean Water and the Basics
Fresh, clean water should be available from day one. Many producers overlook this because calves are on a liquid diet, but water intake drives grain consumption. Calves with free access to water eat more starter and develop their rumens faster than calves that only get liquid through milk feedings. Keep water buckets clean and at a height the calf can reach comfortably.
The daily routine with calves is straightforward but unforgiving. Feed on a consistent schedule, keep housing dry and well-ventilated, observe every calf at every feeding for early signs of illness, and act quickly when something looks off. Calves that are well-managed in the first eight weeks grow into healthier, more productive animals for years to come.