What’s your approach to breeding?

I started to breed cows for milk production. I want at least to or three cow with Artisan; Workaholic; Serious; and Diet Lover.

With my current tactic, I made two cow, one of it is Serious and Diet lover, and the other is Artisan and Workaholic. This two is in the breeding farm, and I hope they will produce the perfect ones. But I start to think maybe a better approach is, I take two cows with 3 desired traits out of the 4 and let them breed instead of a 2-2.

So in example a Workaholic, Serious, Diet lover + Diet lover; Artisan; Workaholic combo is more likely made the 4 traits child, or this and the 2+2 tactic have the same chance for it?

What is your approach? How do you guys make a perfect 4 trait pal? With the highest chance possible?