Sentence:  The familiar hatchery practice of agitating the eggs after they are eyed, called shocking or <WSD>addling</WSD>, ruptures the yolk membranes of the ever-tender sterile eggs. The result is a precipitation of the globulin and a whitening of the egg. 
Meaning of the word marked with <WSD> tags:  The act of causing fertilised eggs to lose viability, by killing the developing embryo within through shaking, piercing, freezing or oiling, without breaking the shell or other outer layer.