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Rust Animal Breeder
Set each parent's genes - both copies, because the hidden one can still be passed on - and their two family marks. The results show what the lamb or calf is likely to be.
Mother
| Gene | Copy 1 | Copy 2 | Shows |
|---|---|---|---|
| D Dung | |||
| Y Yield | |||
| F Fertility | |||
| H Hardiness |
Father
| Gene | Copy 1 | Copy 2 | Shows |
|---|---|---|---|
| D Dung | |||
| Y Yield | |||
| F Fertility | |||
| H Hardiness |
Odds for the young, gene by gene
| Gene | Shows good | Shows OK | Shows bad | What it does |
|---|
How breeding works
- Each gene has two copies; the animal shows the better one, and either copy can be passed on.
- A young animal gets one random copy of each gene from each parent, and one random family mark from each parent.
- If its two family marks match, it is inbred.
- Since 2026-11-05 you own an animal by buying it or by it eating at your trough; unowned animals don't breed.
- Owned free-range cows stop breeding past 6; penned animals stop when the pen is too small for the herd.
- Pregnancy takes about 10 minutes and young grow up in about an hour.
- Inbred: Good acts as OK and OK acts halfway between OK and Bad (Bad stays Bad); the real copies are still passed on.
Facepunch doesn't publish gene numbers; these come from fan tools that read the game files (medium - three fan sources that read the game files agree; Facepunch publishes no gene numbers). Livestock was reworked on 2026-11-05 - one source says the Longevity gene was removed then, so it isn't listed. Checked 2026-11-13. Sources: Facepunch - Livestock Update devblog (2026-10-01); Facepunch - Printed and Polished devblog (2026-11-05); Godclone livestock planner (fan tool, 2026-10-04); Rust Animals - livestock genetics (fan guide); Rust Animals - sheep (fan guide); Rust Cow Tracker guide (fan tool, 2026-11-06).
Breed Rust sheep and cows by their genes: set each parent's two copies of Dung, Yield, Fertility and Hardiness plus their family marks, and see the odds for the lamb or calf - every gene, the chance it's inbred, twins, and the wool or milk you can expect.