Does eating eggs break the precepts? On the Buddhist days for eating vegetarian, as laypeople is it okay if we eat eggs? I hear people say that eggs grown for eating are not devoid of life. If eaten, is one guilty of killing?
There is are few incidents mentioned in Buddhism about egg consuming leading to bad karma.

Explanation - "How could eggs be bad"

Recognition of life in Buddhism is not only walking talking life,it also includes potential life(like an egg).An egg is not a creature,true.But if correct conditions are given it turns to life,So it is potential life.And killing things alive or killing potential life is recognized as bad Karma.

People mentioned to have suffered from bad karma(From the consumption of eggs)when Lord Buddha was alive.

"One day a prince invited  Lord Buddha to his new castle.He laid a carpet thinking if i will have children Lord Buddha will enter my palace walking on this carpet.When Lord Buddha arrived no such thing happend.Lord Buddha skipped the carpet and set foot on the ground.In the end the price asked why.Lord Buddha said i knew your wish,unfortunately you two will have no children so i didn't used the carpet.And Lord Buddha went on to describe why.

Lord Buddha said once in a previous life you were a merchant sailing across the sea to do your business.One day a storm took your ship and you were washed up to a beach of a small island.there was nothing but bird nests.
You,fearing for your life consumed eggs of those birds.Because of that Karma you generated you will have no children"

This prince never had children as Lord Buddha said!

If you look you would find many tales of such incidents,we are Buddhists from birth in my country (Sri Lanka) and we are not in a common understanding about Farmed eggs (the white eggs you see in the market) because they supposedly have been modified to not to give bith.But most of us keep away from eggs unwilling to take the risk.