External defects include shell quality, cleanliness, shape, texture and soundness. Egg quality defects lower the grade, consumer appeal, storage/shelf life, hatchability, increase egg breakage and cost of packaging. Internal quality defects are in the yolk and albumen. They occur in the form of blood and meat spots, double yolks, mottled and discoloured yolks, rotten eggs, watery whites, discoloured whites and round worms in eggs.