COI: a full breakdown guide with notations [WIP]

[Ealesi]

Hello! Welcome to my nerdy brain portion of how COI works and a guide of sorts for those who want to learn how to lower their coi (or maintain a low COI).

(This is going to be a lengthy topic. For quick answers, see the google doc.)

The main portion of this guide will be going over how to keep a low COI, and how to maintain a low COI.
For many general questions, please review this google doc that goes over most of the generals of COI.
https://docs.google.com/document/d/196h ... sp=sharing

For more help, I also have a discord set up with the passing of ac stock and hands on tips and tricks for low coi breeding.

https://discord.gg/rys7pGhyjw

What is COI? Coefficiency of Inbreeding.
COI tells you how inbred your horses are. The more a horse appears in a horse’s pedigree as an ancestor, the more inbred the horse will be. Think of this like the Targaryen Family Tree, except sometimes quite a bit harder to understand. In human history, the Habsburgs famously married and had children with nieces and uncles, having a human inbreeding COI of an average 9%. This lead to numerous health issues as well as fertility issues.

Now that we know what COI is, let's address how to make it work on HWO as the game stands: mostly 100%+ COI stock in the HGP range of 55-72k. How can we fix this? Let us deep dive.

The easy way is to just say "Well, let's breed 0 coi horses to the 100%+ COI horses!"

The problem with that is not all horse breeds are available in the Adoption Center. You can't just go and spent 25 PonyTokens and get any available breed. You are limited to a handful of breeds:

• Arabian
  Belgian
  Caspian
  Forest Horse
  North African Barb
  Przewalski Horse
  Shetland Pony
  Tarpan
  Turkmene

These horse are called Ancient Breeds in HWO. These are the building blocks of all possible breeds on HWO. They can also be bred by themselves without having to play build a breed.

How do you build a breed you ask?

It's complicated. You can't just breed two horses and always expect to get a new breed. It takes weeks to months (depending on how fast you play/move and get turns) to create a complicated breed. Here's some complicated breeds as examples:

• Thoroughbreds
  Auxios
  Bardigiano
  Comtois
  Danube
  Dartmoor
  East Bulgarian

Here's some examples of easier breeds to create:

• Akhal-Teke
  Baladi
  Hucul
  Mongolian
  Kirgiz
  Exmoor

A total list of all breeds can be found here:
https://www.horseworldonline.net/wiki/breeds

How do I make these breeds with a low COI?

That is the million dollar question.
Not really.
It starts with a lot, and I mean a lot, of AC stock. Starting with a already 0 COI stock such as AC Arabians, can be a money and time saver. Make sure to set yourself up for success as it's easier to raise COI, rather than lower it. The more stock of your chosen breed or to make a new breed, the better off you are. It takes a much longer time to lower COI in generations using 100%+ stock with 0% stock (roughly minimum of 20 generations, at a rough math) that it does to raise COI (taking merely one generation to even raise up to 25%).

Keep track of your horses with a name or number system. Example one line of mine to make 0.25% thoroughbreds is all Tortured Poets Department lyrics. Another is superheroes from a bunch of different genres.

All of this to say, yes. It is possible to breed low COI stock.


When does COI become a problem?

Currently? It's not a function in game (4/25/24). Confirmation that it is a possibility has been confirmed by LarrissaR, both on forums and the Chat Room discord:

"Eventually there will be genetics added to the game that can have negative health effects and a high COI will increase the chances of those bad genes being passed on. I just don't want players to think that I'm specifically programming in negative effects at only 40% COI and higher, it's more like a sliding scale. Low is good, high is bad."

What does it mean right now when it's not implemented in game? Well, in short, it's a period to get our houses, and horses, in order. Use this time wisely to find your breed, the one you like best, and keep that COI low. Currently with COI not being the biggest issue, it's great to work with trying genetic positives into your line, however when the >40% sliding scale issues get implemented, that can be a very hard time to have to lower your COI from 100%+ (max 200%).

The one thing you need to be careful of with COI is the plateau area. That comes about in the 80% range. That's about the same time you'll start creating carbon copy horses (horses that seem more identical or closer to being identical than not). If you (maybe WHEN you) get to this point, you can start to weed out all the GOOD genes that push the horses upwards further. So the plateau must be watched for, but if you have a far-sized breeding base, it won't be a problem for awhile.
So, remember to use COI when it fits your needs.

[WIP - updates will include recipe breeding information, and go further in depth on optimization of low COI and how to use your playstyle to maximize efficiency]

[Ealesi]

Abaco Barb: breakdown on how to breed with low coi
This is for a pair of 2 horses. Any repeats are left under the half where they first occur.
This includes no outside studs.

Garrano x Spanish Barb = Abaco Barb

Start cost:
15 Arab
17 Tarpan
14 NAB
12 Forest Horse
4 Przewalski Horse

62 base horses x 25 PT = 1550 PT if buying from AC

Garrano Half
[ Przewalski Horse x Tarpan ] x Tarpan = Mongolian
[ Arabian x North African Barb ] x [ North African Barb x Forest Horse ] = WAB
[ Tarpan x Mongolian ] x [ Tarpan x West African Barb ] = Sorraia
Sorraia x [ Arabian x Sorraia ] = Garrano

Spanish Barb Half
[ Arabian x Sorraia ] x North African Barb = Spanish Jennet
West African Barb x Sorraia = Carthusian
[ Sorraia x Carthusian ] x [ Sorraia x West African Barb ] = Andalusian
[ Spanish Jennet x West African Barb ] x [ Andalusian x West African Barb ] = Spanish Barb

[Ealesi]

Abtenauer low coi guide
This is for a pair of 2 horses. Any repeats are left under the half where they first occur.
As long as used horses are 5 generations apart, you can cut down on the PT cost as long as you can freeze them.
This includes no public studs.

Spanish Barb x Noriker

Start Cost:
16 Arab
18 Tarpan
32 NAB
12 Forest Horse
8 Belgian

86 base horses x 25 PT = 2150 PT

Spanish Barb Half
[ Arabian x Sorraia ] x North African Barb = Spanish Jennet
[ Arabian x North African Barb ] x [ North African Barb x Forest Horse ] = WAB
West African Barb x Sorraia = Carthusian
[ Tarpan x Mongolian ] x [ Tarpan x West African Barb ] = Sorraia
[ Przewalski Horse x Tarpan ] x Tarpan = Mongolian
[ Sorraia x Carthusian ] x [ Sorraia x West African Barb ] = Andalusian
[ Spanish Jennet x West African Barb ] x [ Andalusian x West African Barb ] = Spanish Barb

Noriker Half
Forest Horse x Belgian = Ardennis
[ Tarpan x Belgian ] x [ Forest Horse x Belgian ] =Norman Cob
Norman Cob x [ Forest Horse x Belgian ] = Percheron
[ Forest Horse x Spanish Barb ] x [ Ardennais x Percheron ] = Noriker

[Ealesi]

Abyssinian
This is for a pair of 2 horses. Any repeats are left under the half where they first occur.
This includes no public studs.

[ Arabian x North African Barb ] x North African Barb

Start Cost:
2 arab
4 NAB

6 base horses x 25 PT = 150 PT if buying from AC

[Ealesi]

Aegidienberger
This is for a pair of 2 horses. Any repeats are left under the half where they first occur.
This includes no outside studs.

Icelandic Pony x Peruvian Paso

Start Cost:
26 Tarpan
10 Przewalski Horse
6 Arabs
10 NAB

52 base horses x 25 = 1300 PT if all are AC

Icelandic Pony Half
[ Przewalski Horse x Tarpan ] x Tarpan = Mongolian
Mongolian x [ Przewalski Horse x Mongolian ] = Norwegian Fjord
Tarpan x Norwegian Fjord = Icelandic Pony

Peruvian Paso Half
[ Arabian x North African Barb ] x [ North African Barb x Forest Horse ] = WAB
[ Tarpan x Mongolian ] x [ Tarpan x West African Barb ] = Sorraia
West African Barb x Sorraia = Carthusian
[ Sorraia x Carthusian ] x [ Sorraia x West African Barb ] = Andalusian
North African Barb x Andalusian = Peruvian Paso

[Ealesi]

Aenos
This is for a pair of 2 horses. Any repeats are left under the half where they first occur.
This includes no outside studs.

Pindos Pony x [ Tarpan x Pindos Pony ]

Start cost:
4 Tarpan
2 NAB
2 Caspian

8 base horses x 25 = 200 PT if buying from AC


Pindos Pony Part
Tarpan x [ Caspian x North African Barb ] = Pindos Pony

[Ealesi]

Ahkal-Teke
This is for a pair of 2 horses. Any repeats are left under the half where they first occur.
This includes no outside studs.

Arabian x Turkmene

Start cost:
2 arab
2 turkmene

4 base horse x 25 PT = 100 PT if using AC horses

[Ealesi]

Albanian
This is for a pair of 2 horses. Any repeats are left under the half where they first occur.
This includes no outside studs.

[ Arabian x Turkmene ] x [ Tarpan x Mongolian ]

Start cost:
2 Arab
2 Turkmene
6 Tarpan
2 Przewalski Horse

12 base horses x 25 PT = 300 PT if buying from AC


[ Przewalski Horse x Tarpan ] x Tarpan = Mongolian

[Ealesi]

Altai
This is for a pair of 2 horses. Any repeats are left under the half where they first occur.
This includes no outside studs.

Tarpan x [ Tarpan x Mongolian ]

Start cost:

8 Tarpan
2 Przewalski Horses

10 base horses x 25 PT = 250 PT if buying from AC


[ Przewalski Horse x Tarpan ] x Tarpan

[Ealesi]

Alter-Real
This is for a pair of 2 horses. Any repeats are left under the half where they first occur.
This includes no outside studs.
As long as the thoroughbreds are 5 gens apart, they can be frozen thus reducing cost.
Freezing key pieces allows some cost saving but may result in up to 20% coi.

[ Arabian x Andalusian ] x [ Andalusian x Hanoverian ]

Start Cost:
40 Arab
28 NAB
24 Tarpan
12 Forest Horse
4 Turkmene
6 Przewalski Horse

114 base horses x 25 PT = 2850 PT using AC horses


Andalusian Half
[ Arabian x North African Barb ] x [ North African Barb x Forest Horse ] = WAB
West African Barb x Sorraia = Carthusian
[ Tarpan x Mongolian ] x [ Tarpan x West African Barb ] = Sorraia
[ Przewalski Horse x Tarpan ] x Tarpan = Mongolian
[ Sorraia x Carthusian ] x [ Sorraia x West African Barb ] = Andalusian


Hanoverian Half
Forest Horse x [ Arabian x Andalusian ] = Friesian
Arabian x Turkmene = Ahlal-Teke
Exmoor Pony x [ Exmoor Pony x Friesian ] = Galloway
[ Arabian x North African Barb ] x [ Akhal-Teke x Galloway ] = Thoroughbred
Thoroughbred x [ Arabian x North African Barb ] = Cleveland Bay
[ Thoroughbred x Cleveland Bay ] x Cleveland Bay = Norfolk Trotter
[ Thoroughbred x Trakehner ] x [ Norfolk Trotter x Cleveland Bay ] = Holstein
[ Turkmene x Mongolian ] x [ Arabian x Thoroughbred ] = Trakehner
Thoroughbred x Holstein = Hanoverian