Mods / Truth and Beauty: Seasonal Animal Breeding

Tags:
Creatures
Authors:
sekelsta, Kwyl
Side:
Server
Created:
Oct 22nd 2025 at 1:05 AM
Last modified:
Feb 28th at 7:04 PM
Downloads:
3061
Latest release (for Vintage Story 1.21.4 - 1.21.6, outdated):
seasonal_breeding_1.1.1.zip  1-click install

Depends on Genelib.

This does exactly what the title says: Adjust the timing of animal breeding to match the in-game seasons.

What that means:
- All pregnancy lengths are set realistically according to the length of the game's years, along with the time it takes for the offspring to reach adulthood.
- Certain species will only mate at certain times of the year, timed so that when the pregnancy is over, it will usually be spring or summer. For instance, bighorn sheep will mate in late fall, carry the pregnancy through the winter, then after 6 months give birth in late spring.
- Other species can breed year-round, for instance hyenas and gazelles.
- Seasons adjust to match the hemisphere, so if you travel to the Southern Hemisphere where the seasons are opposite, the animals will breed at their usual season of the weather, even though that happens at a different month of the year.

 

Note that this can make breeding quite slow! Many species take more than a year per generation. So you may want to use this with 3 or 6 days per month, or on a server set to keep running even when all players are offline.

 

Affects all vanilla animals that breed except chickens, which already stop laying during the winter. If you install a mod that makes more vanilla species breed, it will affect them too, except bears and fish. Note the pig breeding is based on the European wild boar, not the domestic pig.

Also includes compatibility for animals from the Fauna of the Stone Age mod series thanks to Kwyl!

 

This feature was split from Truth and Beauty: Detailed Animals into a separate mod. You can use both mods together to get all features from both, in particular, Detailed Animals will make almost all animal species able to breed.

If you have any questions or comments, you're welcome to hop into my modding discord.

Mod Version Mod IdentifierFor Game version Downloads Released Changelog Download 1-click mod install*
1.1.1 seasonalbreeding
1.21.4 - 1.21.6
1419 Feb 28th at 7:04 PM seasonal_breeding_1.1.1.zip 1-click install

Fixed animal growth times not set up correctly for FotSA animals

1.1.0 seasonalbreeding
1.21.4 - 1.21.6
974 Dec 19th 2025 at 1:56 AM seasonalbreeding_1.1.0.zip 1-click install

Add compatibility with Fauna of the Stone Age mods - Kwyl

1.0.0 seasonalbreeding
1.21.2 - 1.21.5
668 Oct 25th 2025 at 2:22 PM seasonalbreeding_1.0.0.zip 1-click install

First release

5 Comments (oldest first | newest first) (threaded | flat)

GhostComit, May 17th at 6:11 PM

Will this be updated?

sekelsta , Jan 18th at 11:33 AM

TheDarkPlague This sounds normal. The seasonal information only shows when it is not the correct season, and even in vanilla animals sometimes take their sweet time about breeding.

TheDarkPlague, Jan 17th at 11:26 AM

Hey! Is the mod still compatible with Fauna of the Stone Age? In the game, I have a herd of cattle from the Bovinae mod, and the females are displayed as ‘ready to mate’ but do not do so, and there is no indication of a breeding period on the females' UI.

Denali_Rainbow, Jan 15th at 7:54 AM

I love the concept of this mod but I find the short breeding windows very restrictive. Would this be possible to tweak to make the breeding window longer?

gNecrOz, Dec 27th 2025 at 12:48 AM

So I read you mentioned this slows the breeding... I would love to use this on my RP server, but we have 30 day months set and have some configs tweaked to adjust how sever hunger would be. 

 

More or less, I'm curious if there are configs to tweak gestation times etc. 

 

Thanks 🥰