Sentence:  [I]n 1999, we issued regulations for a special Canada goose permit to provide state wildlife agencies the ability to manage and control resident population Canada geese. These permits can authorize <WSD>addling</WSD> of eggs from March 11 through August 31. 
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.