I understand why you would do that but if you think about it it would make chickens more useful if you kept it to where they could pop out eggs faster than it would take for the chickens to fully grow up. So that they would be an actual viable alternative to cows. Because at the moment you need so many chickens to even gain some amount of profit from them that the frame drops they cause isn't worth it to have them. So I would definitely say that you should actually make it to where they pop out eggs faster but make it take longer for them to grow up so that it would balance it out. This way it would also fit into when you put a max amount of chickens and cows and items that you can have in a base.
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Chickens are the early (cheap) alternative to having cows. Like cotton trees are the early game version to woollies. You should get rid of chickens late game because they are not as efficient. I actually have another plan for chickens. It is super secret though :) LOL not really (I might have posted about it in a dev log), but I do plan on making chickens more useful. It will be one of my side projects to keep me from going mad.