Which cattle breeds have the shortest gestation?

Dairy breeds are shortest. Holstein and Jersey cows average 279 days, Angus about 281 days. Continental beef breeds such as Simmental and Charolais average 287 days, and Brahman cattle average 292 days.

Does calf sex change the due date?

Slightly. Bull calves are typically carried about one to two days longer than heifer calves, so a herd average of 283 days becomes roughly 284 days for a bull calf and 282 days for a heifer calf.

When should a cow be dried off?

Dairy cows are normally dried off 60 days before the expected calving date, which is around day 223 of gestation. A shorter dry period reduces milk yield in the following lactation.

How early can pregnancy be confirmed in cattle?

Transrectal ultrasound detects pregnancy from about day 28, blood tests from about day 28, and manual palpation from about day 35. Confirming again at 60 to 90 days catches early embryonic loss.

How accurate is a cow gestation calculator?

It gives a planning estimate from breed averages. Around two thirds of cows calve within about five days of the calculated date, but the full normal range spans nearly two weeks, so prepare the calving area early.

Cow Gestation Period: How Long Is a Cow Pregnant?

Q: How long is a cow pregnant?

A cow is pregnant for about 283 days, which is roughly nine months and one week. Normal gestation runs from 279 to 292 days depending on breed, calf sex and whether she is carrying twins.

A cow, also known as cattle, is pregnant for about 283 days, roughly 9 months and 1 week. Normal calving happens between 279 and 292 days, and a typical litter is 1 calf.

How long is a cow pregnant?

A cow carries her calf for an average of 283 days, or about 9 months and 1 week. Counting from the breeding date, calving is normal anywhere from day 279 to day 292.

Key checkpoints across the 283-day cow gestation, measured in days from breeding:

Cow gestation timeline from day 0 to day 283: day 30 Pregnancy check by ultrasound; day 223 Dry off (60 days pre-calving); day 253 Pre-calving vaccinations; day 273 Move to calving pen; day 283 Expected calving.

Cow gestation stages, month by month

Days 1–60: early embryonic period

The embryo attaches to the uterine wall between days 17 and 42. Most pregnancy losses happen in this window, so avoid heat stress, abrupt ration changes and unnecessary handling. Ultrasound can confirm pregnancy from about day 28 to 30.

Days 61–180: mid gestation

Foetal growth is slow and the cow's nutritional demand is close to maintenance. This is the cheapest period to feed and the best time for hoof trimming, vaccination and any routine handling.

Days 181–250: late gestation growth

Roughly 70 to 75 percent of foetal growth happens in the last third of pregnancy. Energy and protein requirements climb steadily, and body condition should be built now rather than after calving.

Days 251–283: pre-calving

Dairy cows are dried off around 60 days before the due date. Pre-calving vaccinations raise colostrum quality. In the final two weeks the udder fills, the pelvic ligaments slacken and the cow should be moved to a clean, well-bedded calving area.

Signs a cow is pregnant

No return to oestrus roughly 21 days after service
Positive rectal palpation from about day 35 or ultrasound from day 28
Blood or milk pregnancy-associated glycoprotein test positive from about day 28
Gradual abdominal enlargement on the right side from mid gestation

Signs of approaching calving

Udder development in the last four to six weeks, earlier in heifers
Relaxed pelvic ligaments, a slack tailhead and a swollen vulva in the final days
Contact your vet if labour stalls, if the animal strains without progress, or if there is abnormal discharge before calving begins.

What affects cow gestation length

Gestation length is moderately heritable and is influenced more by the sire's breed than by the dam's, because the calf's own genetics affect when labour begins.
Bull calves are carried on average one to two days longer than heifer calves.
Twins shorten gestation by roughly five to ten days and raise the risk of retained placenta and freemartin heifers.
Cows carrying a calf through a hot summer often calve slightly earlier, while cold conditions late in gestation tend to lengthen gestation by a few days.

Estimate your cow's calving date

Enter the breeding date for an estimated calving date at 283 days.

Estimate a cow due date

Breeding date

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Saturday, 8 May 2027

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17 May 2027

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