Best thing I could think of is perhaps keep a small 'building' consisting of three walls and an open side roofed over that has a stockpile inside set for eggs, if you want to keep the free range aspect. That means the dinosaurs aren't trapped and can still wander and your colonists will just go grab the eggs and haul them there, they should hatch then.

Without a roof there won't be any way to change it so that they don't rot unless I code it so that they don't rot, and I'm not sure I'd want to do that since making/breeding these dinosaurs is meant to be quite tough and not something you can easily just mass produce.

you dont have to do that its ok its your mod i just wanted to know if there was a way around it

since i let them go so often they like to try and eat each other. ive noticed its really weird like a adult albertosaur was haveing trouble killing a juvi galli