Know · Breeding & ranch planning
Cattle Gestation Chart: Breeding to Calving Timeline
Breed-aware gestation chart and calving windows that hand off to the live cattle gestation calculator.
How to use this gestation chart
A cattle gestation chart estimates calving from a breeding or AI date using breed-typical day counts. Real calving still varies by individual, fetal sex, nutrition, and season — use a ±7 day window for labor planning, not a guarantee of the exact hour.
Pick your breed row below, then open the live calculator with your actual service date for milestones and a printable timeline.
Gestation length by breed
| Breed / type | Typical days | ±7d window note | Calculator |
|---|---|---|---|
| Standard Beef Average | 283 | Due ±7 days (~276–290 from service) | Prefill → |
| Angus (Black / Red) | 281 | Due ±7 days (~274–288 from service) | Prefill → |
| Hereford / Polled Hereford | 285 | Due ±7 days (~278–292 from service) | Prefill → |
| Charolais | 289 | Due ±7 days (~282–296 from service) | Prefill → |
| Simmental | 286 | Due ±7 days (~279–293 from service) | Prefill → |
| Brahman / Zebu InfluenceFrom link | 292 | Due ±7 days (~285–299 from service) | Prefill → |
| Gelbvieh | 283 | Due ±7 days (~276–290 from service) | Prefill → |
| Limousin | 289 | Due ±7 days (~282–296 from service) | Prefill → |
| Dairy (Holstein / Jersey) | 279 | Due ±7 days (~272–286 from service) | Prefill → |
Educational averages for planning. Association or herd data may differ — adjust with the custom-days option in the calculator when needed.
Pregnancy milestones
From breeding / AI date
- Day 18–24: Return-to-heat watch — Watch for repeat estrus if open.
- Day 30–45: Early pregnancy ultrasound window — Common early diagnosis window with a veterinarian.
- Day 60–90: Palpation / mid pregnancy check — Confirm pregnancy and stage with herd vet protocols.
Before expected calving
- Pre-calving vaccine window: Coordinate scour / respiratory vaccines with your veterinarian.
- Close-up / maternity pen: Move pairs to a clean, monitored calving area.
- Expected calving window: Practical ±7 days around the estimated due date.
Open the gestation calculator
Enter breeding date and breed to get estimated calving, the ±7 day window, heat return, pregnancy-check ranges, and pre-calving vaccine timing.
Open cattle gestation calculatorWorking backward from a target calving date? Use the calving date calculator.
Calving-week weather readiness
Gestation math fails if the calving pasture is a mud trap or a cold snap hits without feed and shelter. In the week before the due window, check cold stress, heat/THI, water, and daily ranch actions.
Coming from AI breeding? Start at the artificial insemination hub.