Calving a Cow: Signs a Cow Is About to Give Birth, When to Help

The signs a cow is about to give birth are a full, tight udder, a swollen and loose vulva, softened pelvic ligaments that make the tailhead look sunken, and, in the last hours, restlessness, a raised tail and a habit of wandering off alone. Once the water bag or feet show and she is straining hard, a mature cow should calve within about 30 minutes and a first-calf heifer within about an hour; if she passes that point with no progress, get her examined or call your veterinarian.

Most cows and heifers calve without any help, and calving a cow well is mostly about watching closely and knowing the handful of timing rules that tell you when a normal birth has stopped being normal. The physical signs are unreliable on their own, so the most useful thing you can know is her due date: put the breeding or AI date into the free cattle gestation calculator for a calving date and window, and read the cattle gestation guide for how long cows are pregnant and what shifts the date.

This guide covers the signs of calving from weeks out to the final hours, how long a cow is in labor at each stage, the specific points at which to call a veterinarian, and what to check in the first hours after the calf is on the ground. It does not teach you to deliver a calf. If a birth goes wrong, the right move is an experienced, trained pair of hands or your vet, not a set of instructions read in a barn. For breed profiles and the rest of our cattle guides, start at the Creatures cattle page.

Signs a cow is about to give birth

Signs of calving build over weeks, then days, then hours. Rick Rasby of University of Nebraska Extension describes the gradual changes as udder development (“making bag”) and relaxation and swelling of the vulva, or “springing”, with a thick, stringy mucus plug sometimes hanging from the vulva in the weeks before calving. Closer in, the ligaments on either side of the tailhead relax, which Rasby says can be a clue that calving will happen within the next 12 to 24 hours, and the teats may fill and “strut” a couple of days out. Mississippi State University Extension’s Beef Cattle Calving Management guide (P2558) puts pelvic ligament relaxation and teat strutting usually within 24 hours of calving.

In the final 12 hours or so, behavior changes: a cow that does not come up to eat, or one that takes herself off to a corner of the pasture. University of Maryland Extension lists decreased feed intake, less cud chewing, a lifted tail, restlessness and seeking isolation as the signs of early labor.

Timings in this chart are typical estimates from the extension sources cited above, not guarantees. Rasby’s caution is the one to remember: most cows show few behavioral changes until labor actually starts, and even experienced people cannot reliably call the day from the udder and vulva alone. That is why the due date matters. Knowing a cow is within her calving window tells you to check her often, and the signs above tell you how often.

How long is a cow in labor? The three stages of calving

Veterinary and extension sources divide calving into three stages. Knowing where a cow is in that sequence is what lets you judge whether things are moving normally.

Stage 1: the cervix opens

Stage 1 is the cervix dilating and the calf turning into position for birth. You see the effect, not the calf: restlessness, lying down and getting up again, arching the back, tail switching, kicking at the belly, and separating from the herd. In SDSU Extension’s iGrow Beef chapter on understanding calving and when help is needed, veterinarian Russ Daly notes these signs are usually more obvious in first-calf heifers than in older cows, and gives the normal length of Stage 1 as two to six hours, sometimes as long as 24 hours in heifers. University of Minnesota Extension adds that the part you can actually see is usually the last four to eight hours.

Stage 1 ends when the cervix is open and the water bag (the fetal membranes) starts to show at the vulva.

Stage 2: delivery of the calf

Stage 2 runs from the water bag or feet appearing to the calf being out, and it is where timing matters most. It is also shorter than many people expect. University of Minnesota Extension gives Stage 2 as about 30 minutes in mature cows and about 60 minutes in heifers, and University of Wisconsin Extension’s three stages of bovine parturition notes that heifers should deliver within an hour and that cows in the research it cites calved within about 22 minutes of Stage 2 starting. Older textbooks allowed several hours for Stage 2, and some references still give wider ranges, but the current extension rules of thumb below are built on the shorter, measured times.

In a normal birth you see the water bag, then two front feet with the soles pointing down (toward the ground when she is standing), then the nose resting on top of the front legs. That front-feet-and-nose-first posture is the normal presentation. Hind feet with the soles pointing up, a tail, one leg, or a head with no feet are all abnormal presentations and a reason to get help, covered below.

Stage 3: the afterbirth

Stage 3 is passing the placenta, or afterbirth. The Merck Veterinary Manual says fetal membranes are normally passed within three to eight hours of the calf, and SDSU gives 8 to 12 hours as typical. Membranes still there 24 hours after calving are a retained placenta. Merck is clear that pulling retained membranes out by hand is not recommended and can be harmful, so leave them alone and involve your vet if she shows any sign of illness (see the list below).

These are typical durations from SDSU, University of Minnesota, University of Wisconsin and Merck, not deadlines. Individual cows vary, and the point of knowing them is to recognize when a cow has fallen well outside them.

When to call the veterinarian: the timing rules

Difficult births (dystocia) are far more common in heifers. Merck’s management of calving in cattle puts dystocia at about 10 to 15 percent of first-calf heifers and 3 to 5 percent of mature cattle, most often because the calf is too big for the heifer’s pelvis. Waiting too long costs more than the calf: in research SDSU cites, once Stage 2 had gone past about 1.5 hours, every 30 minutes of delay in assistance added about six days to the cow’s interval to her next pregnancy.

Extension services publish slightly different numbers, but they agree closely. These are the widely used rules for when a cow or heifer should be examined by someone trained to do it, or your veterinarian should be called:

Sources: SDSU Extension, University of Minnesota Extension, University of Maryland Extension. These are decision points, not a license to pull a calf. An examination tells whether the calf is positioned correctly, whether it is alive and whether it can come out safely, and that is a job for a veterinarian or a trained, experienced stockperson. If you are not both, the rule becomes simple: when a timing rule trips, call.

Call a veterinarian now if you see any of these

Some signs do not wait for a stopwatch. Call your veterinarian straight away if:

• The calf is coming wrong. Hind feet with soles pointing up (a backward calf), only a tail, only one leg, a head with no feet, or feet with no head.
• The placenta comes before the calf. SDSU lists fetal membranes appearing ahead of the calf as a sign of distress, because the calf’s connection to its oxygen supply may already be breaking down.
• The calf’s head or tongue is swollen, a sign it has been stuck for some time.
• There is heavy bleeding from the birth canal or rectum.
• She strains hard and nothing shows at all, or she has shown labor signs for hours with no water bag.
• Any timing rule above has passed and nobody on hand is trained to examine her.
• After calving, the uterus is pushed out (a prolapsed uterus). This is a life-threatening emergency.
• After calving, she goes down, weak or wobbly, in the hours after she first got up. SDSU notes milk fever typically looks like this and says a vet should be consulted; it is essentially unheard of in first-calf heifers.
• After calving, she has a fever, goes off feed, is dull, or has a foul-smelling discharge, especially with the afterbirth still hanging.

Save your veterinarian’s number in your phone before calving season, and talk to them ahead of time about when they want to be called. Calling early is almost always cheaper than calling late, for the calf and for the cow.

How often to check

A timing rule only works if someone saw when the stage started. SDSU suggests checking cattle at least once every three hours during calving season as a minimum, and University of Maryland Extension suggests checking cows showing signs about every two hours. Check heifers, cows past their due date, and anything showing Stage 1 signs more often. SDSU also notes that feeding in the evening (between 4 and 6 PM) has been shown to shift more calvings into daylight hours, when they are easier to watch.

Getting ready for calving season

Most of what goes right at calving is set up before the first cow starts. The essentials:

• A due-date list. Work out every cow’s calving window from her breeding or AI dates (the cattle gestation calculator does one at a time, and there is a Highland cow gestation calculator with Highland presets). On Creatures, recording each breeding on the cow’s profile projects her due date and puts her on the Breeding dashboard under Due soon and Overdue, so the watch list builds itself.
• A clean, dry calving area with good light, deep clean bedding and a safe place to hold a cow for your vet. SDSU notes a cow may lie down during an examination, so restraint needs room for that.
• A calving kit, clean and in one place: shoulder-length OB sleeves and plenty of lubricant, mild soap, disinfectant and a bucket for warm water, clean towels, a thermometer, a flashlight or headlamp, navel dip (University of New Hampshire Extension suggests 7 percent iodine or a 2 percent chlorhexidine dip), frozen colostrum or a quality colostrum replacer with a clean bottle, and your vet’s number. Obstetric chains, handles and calf pullers belong only in the hands of someone trained to use them; misused, they injure calves and cows.
• Heifers in their own group, where you can watch them more closely than the mature cows, since they account for most difficult births.

After the calf is born: the first hours

Once the calf is out, it should be breathing within moments. Clear membranes away from its nose and mouth if they are covering them. SDSU warns against hanging a newborn calf upside down by its back legs to “drain” it: most of the fluid that comes out is from the gut, not the lungs, and the position makes breathing harder. A calf breathes best sitting up on its chest with its front legs tucked under it. A vigorous calf shakes its head and tries to sit up within minutes, and the cow licking it helps stimulate it.

Standing and nursing. Richard Randle, Extension Beef Cattle Veterinarian at the University of Nebraska, writes that vigorous calves stand and nurse within two hours of birth and nurse repeatedly by the time they are 12 hours old; in research he cites, unassisted calves stood and nursed within about 40 minutes, while calves that needed help at birth took more than an hour just to stand. A calf from a hard birth, a twin, a cold calf, or one with a swollen tongue is the one most likely to fall behind.

Colostrum is the clock that matters most. A calf is born with almost no antibodies of its own and gets them from colostrum. Merck notes that a calf’s ability to absorb those antibodies has decreased significantly by 6 to 8 hours of age and is essentially gone by 24 hours. Iowa State’s Iowa Beef Center says beef calves need at least 2 quarts of colostrum in the first 12 hours. If a calf has not nursed within a couple of hours, get colostrum into it, and if it cannot or will not suck, call your vet or an experienced stockperson; tube feeding is a skill to be shown in person, not learned from an article. The bottle-feeding a calf guide covers colostrum and milk replacer for calves that need to be raised by hand.

Navel and cow. Dip the navel soon after birth. Then watch the cow: she should pass the afterbirth within hours, stay bright, and let the calf nurse. Anything on the call-now list above means calling your vet.

Record every calving

The birth you just watched is next year’s decision data. Which cows calved unassisted, which needed help, how big the calves were, and which bull sired them all feed decisions on bulls, culling and replacement heifers. Beef breed associations score calving difficulty on the Beef Improvement Federation scale from the BIF Guidelines for Uniform Beef Improvement Programs:

• 1: no difficulty, no assistance
• 2: minor difficulty, some assistance
• 3: major difficulty, usually mechanical assistance
• 4: caesarean section or other surgery
• 5: abnormal presentation

BIF notes that score 5 is left out of genetic evaluations because abnormal presentations do not appear to be heritable. Scores 1 to 4, together with birth weights, are what calving ease EPDs are built from, which is why breed associations, from Angus to Maine-Anjou, ask for them.

On Creatures, you can keep that history on each animal so it follows her and her calves:

• Record the breeding on the cow’s profile (exact date or an exposure window) to get a projected due date; see recording a breeding and tracking pregnancy and progress.
• Record the birth from the dam’s Breeding tab: Creatures keeps the calves together in a private calf crop, and Create calf profile gives each calf its own profile, already linked to its dam; see recording births and creating a litter. The calf’s pedigree starts on that profile, and the free cattle pedigree chart maker prints one.
• Add a calving ease score and birth weight as a physical measurement record on the calf, and note any assistance, retained placenta or treatment as a health record on the cow.
• Set reminders for the next jobs, such as calf vaccinations and branding or tagging; the cattle vaccination guide covers timing, and cattle ear tags covers identification.

The cattle record keeping guide goes through the full list of what is worth recording across the year, from calving through weaning.

Frequently asked questions

How long is a cow in labor?

From the first restless signs to the calf on the ground, usually a few hours. Stage 1 typically lasts 2 to 6 hours (up to 24 in some heifers). Stage 2, from the water bag or feet to the calf being out, is about 30 minutes in a mature cow and about an hour in a heifer. The afterbirth usually follows within 3 to 12 hours.

What are the signs a cow will calve within 24 hours?

The most useful are softened ligaments either side of the tailhead (the tailhead looks sunken), teats that are full and sticking out, and, in the last 12 hours, going off feed and isolating herself. None of them is exact, so combine them with her due date.

Can you tell exactly when a cow will calve?

Not reliably. Nebraska Extension notes that most cows show few behavioral changes until labor starts. The due date from her breeding date narrows the window; frequent checks do the rest.

Is it normal for a calf to come front feet first?

Yes. Two front feet with the soles pointing down, followed by the nose lying on the legs, is the normal presentation. Hind feet with the soles up means the calf is backward, which is a reason to call for help.

When should the afterbirth come out?

Usually within 3 to 12 hours. If it is still there 24 hours after calving, it is a retained placenta. Do not pull it; call your veterinarian if the cow runs a fever, goes off feed, seems dull or has a foul discharge.

Do cows calve at night?

They calve around the clock, but feeding in the evening has been shown to shift more calvings into daylight hours, according to SDSU Extension.

Do this next on Creatures

Whether you are getting ready for your first calving season or running a herd, Creatures is the records, marketplace and directory layer that keeps each cow’s breeding and calving history in one place. These are the most useful next steps for someone with cows due.