Heat Cycle Calculator
Enter the last heat or breeding date to see when the next three heats are due if she did not settle. Useful for planning AI, a repeat service or a pregnancy check.
Cycle lengths used
| Species | Average | Normal range |
|---|---|---|
| Cattle | 21 days | 18 to 24 days |
| Sheep | 17 days | 14 to 19 days |
| Goat | 21 days | 17 to 24 days |
| Pig | 21 days | — |
Rabbits, alpacas and llamas are induced ovulators and do not cycle on a fixed schedule, so they are not listed. Mares are not included because we have not yet confirmed a cycle length from a source we trust. Sources are listed on the methodology page.