3D Estrous Cycle Lab Preview
Follow the cow’s cycle day by day — which hormone is released where, where it acts, and what happens next — then choose whether she conceives and follow the embryo to implantation. Typical timings; individual cows vary.
After insemination:
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Each coloured circle is a hormone, named inside. The camera follows it from where it is made to where it acts. Pause to turn the model yourself. Brain shown schematically above the tract.
- Oestradiol
- Progesterone
- LH
- FSH
- PGF2α
Swipe sideways to see the whole cycle · tap to jump to a day
Show as a table
| Day | E2 | P4 | LH | FSH | PGF2α |
|---|---|---|---|---|---|
| 0 | 100% | 6% | 62% | 25% | 4% |
| 1 | 40% | 7% | 8% | 65% | 4% |
| 2 | 9% | 9% | 8% | 41% | 4% |
| 3 | 8% | 15% | 8% | 14% | 4% |
| 4 | 17% | 29% | 8% | 12% | 4% |
| 5 | 30% | 53% | 8% | 12% | 4% |
| 6 | 37% | 77% | 8% | 12% | 4% |
| 7 | 30% | 91% | 8% | 12% | 4% |
| 8 | 17% | 97% | 8% | 22% | 4% |
| 9 | 8% | 99% | 8% | 62% | 4% |
| 10 | 6% | 100% | 8% | 45% | 4% |
| 11 | 6% | 100% | 8% | 15% | 4% |
| 12 | 9% | 100% | 8% | 12% | 4% |
| 13 | 17% | 100% | 8% | 12% | 4% |
| 14 | 29% | 100% | 8% | 12% | 4% |
| 15 | 35% | 100% | 8% | 12% | 4% |
| 16 | 29% | 97% | 8% | 12% | 35% |
| 17 | 17% | 80% | 8% | 12% | 70% |
| 18 | 10% | 33% | 8% | 18% | 70% |
| 19 | 23% | 10% | 8% | 55% | 5% |
| 20 | 79% | 6% | 8% | 55% | 4% |
| 21 | 100% | 6% | 62% | 25% | 4% |
Timing differences between species
The model above shows the cow. Timings in other species:
Swipe sideways to see all columns
| Cycle length | Heat lasts | Ovulation | Breeding season | Gestation | |
|---|---|---|---|---|---|
| Cow | ~21 days (18–24) | 12–18 hours | ~10–14 h after heat ends | All year | ~280–285 days |
| Buffalo | ~21 days (17–26) | 18–24 hours (signs often weak or silent) | ~12–18 h after heat ends | All year; peaks in cooler months (Oct–Feb) | ~305–315 days |
| Sheep | ~17 days (14–19) | 24–36 hours | Near the end of heat | Seasonal (short days); Indian breeds often breed most of the year | ~147–150 days |
| Goat | ~21 days (18–22) | 24–48 hours (average ~36) | Near the end of heat | Seasonal tendency; Indian breeds breed most of the year | ~145–155 days |