Red, green and gold question

[SilverCrestStables]

Every horse usually has one or more red, green or gold stats, and *, It's not fun getting a red statted foal, isn't it? But I was actually thinking about this and suddently thought of something.

Can you change it by growth?
Can you actually change a red to a green, a gold to a green etc by feed, training or just plain growth?
Because you can change temperaments, and I was wondering if it is possible then? I have never heard of it but was just wondering... I feel like it's a stupid question

[Argent]

No, you can’t.