A way to increase fertility?

Is there a way to increase fertility in a proxy without having to reproduce to get one that you want?

There isn’t a way to increase it that i know of, what more important is to have sex when the proxy is ovulating. There isn’t really a way that Ive found to tell that in the game without using a hyperbreeder. Though if you want to use the debug menu, you can go to the pregnancy test option and it will tell you what phase of the proxy’s cycle you’re in. Phase one is when they’re fertile and it only lasts about 1 or 2 days.