white horses

Please help me decipher: "WT" and "WSb"
Are those the genes describing white horses in this game and how do I interpret them ?

W - White
T - Tobiano
Sb - Sabino

W+ (white) is dominant and is the color that is visible so to speak. 
If a horse has the W+ gene, it will be white, but can carry other colors and patterns. 

I am in no way an expert on genetics so if I´m wrong, please correct me! :) 

Edit: If you want to play around with different genes and colors you can go to Town - Equine Center > Create a Custom Horse? > Choose a breed. There you can go nuts with all the available genes for that breed. 
When you are done experimenting, just click another link or page here on EV. 

Last edited on 2019-05-11 at 11:36:14 by 🍁 Golden Leaf Stable 🍁

So if there's only "W" then what does it mean ?

I understand then that horses from my example are white tobiano and white sabino but if I breed them with other colours is there a chance to get rid of the white or not ?

Here is a amazing and helpful tool (Thank you UlyssesBlue!) to predict what colors a breeding can produce:
http://equiverse.wikidot.com/calc:gene-calculator

Last edited on 2019-05-11 at 11:39:58 by 🍁 Golden Leaf Stable 🍁

If you bred that horse with one that had no W gene then there would be a chance that the foal would not have white.
Not sure if you've seen this or not but here's a handy genetics guide from vos

Thank you very much !!!