Dairy Cattle Gestation Calculator

Dairy cattle gestation averages 279 days, with a normal range of 277–283 days — slightly shorter than the overall cattle average of 283 days. Holstein and Jersey, the two most common dairy breeds, both average almost exactly 279 days.

Add 279 days to the breeding or AI date. Use the calculator above with your specific breed selected for an exact expected calving date and dry-off date.

Holstein cows — the most common dairy breed worldwide — have an average gestation period of approximately 279 days, at the shorter end of the overall cattle gestation range.

Jersey cows average approximately 279 days of gestation, essentially identical to Holstein. Guernsey cows run slightly longer at 283 days, and Brown Swiss are the notable outlier among common dairy breeds at approximately 291 days.

Standard practice is to dry off (stop milking) a dairy cow approximately 60 days before her expected calving date, giving the udder time to regenerate tissue and the cow time to build body condition reserves for the next lactation. Our calculator shows this dry-off date automatically in the milestone timeline.

The transition period refers to the three weeks before and three weeks after calving — a nutritionally and metabolically demanding window when most dairy health problems (milk fever, ketosis, displaced abomasum) occur. Careful nutrition management during this period, including calcium and energy balance, is one of the highest-leverage practices in dairy herd health.

At 279 days, dairy breeds gestate slightly shorter than beef breeds on average (283 days overall, up to 292 days for Brahman). This modest difference is consistent enough across major dairy breeds that using 279 days rather than the general 283-day average improves accuracy for dairy-focused calculations.