# Cow, Buffalo, Goat & Pig Due Date Calculator (Calving, Kidding, Farrowing)

> Free farm animal pregnancy calculator: expected calving date for cows and buffalo, kidding, lambing and farrowing dates from the mating or AI date.

- Source page: https://wevet.in/calculators/cow-buffalo-goat-due-date-calculator/
- Type: Calculator
- Publisher: WeVet
- Updated: 2026-11-01
- Audience: veterinarians and veterinary students

Expected calving, kidding, lambing or farrowing date from the date of mating or AI — cow, river and swamp buffalo, goat, sheep, pig, horse, donkey, camel and rabbit — and how many days are left.

Use the free interactive calculator: https://wevet.in/calculators/cow-buffalo-goat-due-date-calculator/

## Inputs

- Species: Cow — 279–287 days · Buffalo, river (Murrah etc.) — 305–315 days · Buffalo, swamp — 330–340 days · Goat — 150 days · Sheep — 150 days · Pig (sow) — 114 days · Horse — about 11 months · Donkey — 365 days · Camel — 365–400 days · Rabbit — 31 days
- Mating / AI date

## How it is calculated

**Due date** = mating or AI date + gestation length.

| Species | Gestation |
|---|---|
| Cow | 279–287 days; 283 days is common for most breeds [1] |
| River buffalo | 305–315 days (Murrah 309.9 ± 6.5 days) [2] |
| Swamp buffalo | 330–340 days [2] |
| Goat · sheep | 150 days · 150 days [3] |
| Pig | 114 days [3] |
| Horse · donkey | 11 months · 365 days [3] |
| Camel | 365–400 days [3] |
| Rabbit | 31 days [3] |

Gestation length varies with the age of the dam, breed and sex of the calf; cows carrying bull calves tend to have a slightly longer gestation [1].

## Worked example

Cow inseminated 1 Jan 2026 → expected calving 11 Oct 2026 (window 7–15 Oct).

## Frequently asked questions

### How many days is a cow pregnant?

Gestation length ranges from 279 to 287 days; 283 days is common for most breeds [1].

### How long is a buffalo pregnant?

River buffalo carry for 305–315 days (Murrah 309.9 ± 6.5 days); swamp buffalo for 330–340 days [2].

### What is the gestation period of a goat?

About 150 days, the same as sheep; sows carry for 114 days [3].

## References

[1] How long does a cow's pregnancy last? — Beef Cattle — eXtension (Cooperative Extension). https://beef-cattle.extension.org/?p=212
[2] Gestation and Fetal Development in the Buffalo (Bubaline Theriogenology) — G.N. Purohit — International Veterinary Information Service (IVIS). https://www.ivis.org/library/bubaline-theriogenology/gestation-and-fetal-development-buffalo
[3] Approximate Gestation Periods (table) — MSD / Merck Veterinary Manual. https://www.msdvetmanual.com/multimedia/table/approximate-gestation-periods

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Numbers in [brackets] cite the references above. For veterinary professionals. Information supports — never replaces — clinical judgement; always check the current product label and local regulations.
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