Why Is a Cow Rejecting Her Calf? Behavior Causes and What to Do

A first-calf heifer may be more likely to act uncertain, restless, or defensive around a newborn. Maternal behavior in cattle is strongest around calving, but it can be disrupted if the birth was prolonged, the calf was handled heavily before bonding, or the pair was moved too soon. Cows normally seek some separation from the herd before birth, so crowding, noise, or repeated disturbance can make early bonding harder.

Some cows reject one twin, especially if both calves are competing for attention and nursing. A cow may also seem to reject a calf that smells unfamiliar after prolonged separation or heavy human handling. In these cases, a small clean pen and supervised contact may help, but safety matters because some cows will bunt or kick the calf.

Sometimes the cow is not refusing the calf on purpose. She may be painful, weak, or unable to let the calf nurse comfortably. A difficult birth can leave the cow sore and the calf slow to rise. Merck notes that dystocia is more common in first-calf heifers, and calves from dystocia events often take longer to stand and nurse, which raises the risk of poor colostrum intake.

Udder and teat problems are another major cause. Merck describes mastitis in cattle as an inflammatory udder disease, and clinical cases can cause swelling, abnormal milk, and pain. A cow with a hard, hot, painful quarter or plugged teats may kick away the calf because nursing hurts. Retained placenta, metritis, fever, weakness, low calcium, or other postpartum illness can also reduce maternal behavior and milk letdown. If the cow seems depressed, off feed, straining, or has foul discharge, this is a same-day veterinary issue.

A calf that is premature, weak, chilled, injured, or affected by a hard birth may not get up, search, latch, or suck strongly enough to keep the cow engaged. Merck advises checking for obvious congenital problems and supplementing colostrum early when a neonate does not stand or nurse successfully within 2 to 4 hours. In practice, a slow calf can make a normal cow look rejecting because the pair never completes the early nursing cycle.

Watch for poor suck reflex, inability to stay sternal, cold mouth or ears, swollen tongue, abnormal limbs, or repeated failed attempts to latch. If the calf is alive but not nursing well, the clock matters. Merck states that administration of 4 L of colostrum by esophageal feeder within the first 2 hours can be an effective policy when timely nursing cannot be ensured.

Move the cow and calf to a small, clean, dry pen with good footing if it is safe to do so. Keep the environment quiet and reduce extra handling. Check whether both teats can be stripped and whether colostrum or milk is present. If the udder is very hard, hot, uneven, or painful, call your vet promptly.

Then focus on the calf. Make sure it is warm, breathing normally, and able to hold itself upright. If it has not nursed within a few hours, contact your vet about assisted nursing, bottle feeding, or tube feeding colostrum. Commercial calf colostrum replacers are commonly available in the U.S. at about $30 to $40 per dose in 2025-2026, which can be useful when maternal colostrum is unavailable or inadequate. Do not wait all day hoping things will sort themselves out if the calf is weak or the cow is actively attacking it.

See your vet immediately if the cow is aggressively butting, trampling, or repeatedly kicking the calf; if the calf has not received colostrum in the first hours after birth; or if either animal looks sick. Emergency warning signs in the cow include fever, foul-smelling discharge, severe udder swelling, inability to rise, ongoing straining, or obvious pain. Emergency warning signs in the calf include weakness, cold body temperature, failure to stand, poor suck, labored breathing, or no nursing by 2 to 4 hours.

Even when the pair eventually bonds, calves that miss early colostrum are at higher risk for failure of passive transfer and later illness. Merck lists bovine IgG testing among tools used to assess passive transfer, and Cornell's 2025 fee schedule lists bovine IgG testing at $35, which can be part of follow-up in high-risk calves when your vet is concerned about inadequate colostrum intake.

There is not one single right answer for every rejecting cow. Some pairs need quiet observation and brief assistance. Others need active medical care for the cow, colostrum support for the calf, or a plan to raise the calf separately. The best option depends on the cow's behavior, the calf's strength, the time since birth, and what your vet finds on exam.

A Spectrum of Care approach means matching the plan to the situation. Conservative care may center on a bonding pen, supervised nursing, and prompt colostrum support. Standard care often adds a veterinary exam for the cow and calf, treatment of pain or udder disease, and a clear nursing plan. Advanced care may include intensive neonatal support, bloodwork, passive transfer testing, plasma or serum support, or hospitalization when the calf is weak or septic.