🐄 Cow Gestation Calculator
Plan herd management tasks with accurate calving projections based on the service date.
Use AI, natural service, or embryo transfer date as the baseline.
Gestation Overview
Average gestation for dairy and beef cattle is 283 days, with most calvings occurring between 279 and 287 days after breeding.
How to Use This Calculator
Record the breeding event
Enter the insemination or bull service date. For embryo transfer, use the transfer date.
Generate calving projection
Run the calculator to view average, early, and late calving windows with management reminders.
Plan herd logistics
Schedule veterinary checks, dry-off dates, nutrition adjustments, and calving pen preparation around the milestones provided.
Formula
Calving Date = Breeding Date + 283 days
Gestation length varies slightly among breeds and individuals. Use the ±4 day window to account for natural variation and monitor cows closely as the calving period approaches.
Full Description
Accurate calving projections improve herd productivity, labor planning, and neonatal care. This calculator combines average bovine gestation data with key management checkpoints to keep dairy and beef operations on schedule.
Environmental conditions, nutrition, and calf sex can influence gestation length. Monitor body condition and consult veterinarians to tailor herd-specific protocols. Early identification of late or early calving trends supports better reproductive performance metrics.
Frequently Asked Questions
Do different breeds have different gestation lengths?
Yes. Beef breeds sometimes carry calves a few days longer than dairy breeds, but most remain within the 279–287 day window.
How accurate is AI breeding record data?
Artificial insemination records usually provide precise dates. Always verify conception with pregnancy checks around 30–40 days after breeding.
When should I dry off dairy cows?
Begin the dry period roughly 60 days before projected calving to support udder recovery and colostrum quality.
What if calving has not started by the late window?
Some cows carry calves slightly longer. Monitor for calving signs and consult a veterinarian if gestation exceeds 290 days or if calving difficulties arise.