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In short, except for getting a share of a Rank Special that includes Brindle in its gene set, there is NO easy way to get a brindle. I would say that most of the time it is more than a few game years between the occurance of spontaneous brindles, and the odds of getting a foal from two brindle parents are very small. I forget the correct number, but it's still very tiny. I've been playing HaJ 1 since 2011, and I have had one brindle foal appear, many real-life years ago. I haven't been trying for them, mind you, but that's a sign of how rare they are.

Super super super low chance, but yes, there is a chance. For perspective, back at the beginning of the year when I was breeding my entire herd of about 1500 mares, I was getting about one brindle every two years. I don't know if those odds are significantly increased by the fact that back then I had probably 70 brindle foundations and a few brindle gen 2s... I have reduced my mare herd and my herd of brindle mares, so it will be interesting to see how often I get brindles now. But I think I'm not being inappropriately encouraging or discouraging to you to say that my ratio was around one brindle in 3000 breedings. If anyone else has better math than that, please chime in here.

Yep. We even have a very small chance when breeding our brindle mares to brindle stallions lol. I just got my first brindle at the end of last season after 9 months of trying lol. Now some people of course get luckier. And some arent even as lucky. But it makes it super special when you do get one!

In real life brindle is caused by a very rare mutation that isn't usually (maybe never, fuzzy on the exact details) inheritable. So in real life a brindle foal can come from non brindle parents, and brindle parents, more often than not, will never have a brindle foal. I would classify brindles as "freaks of nature."

You might find this article interesting as well as looking at the link for "chimerism" in the article.
https://en.m.wikipedia.org/wiki/Brindle