الفهرس 
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Abstract
The Present work aimes to : Two experiments were conducted the first one. was designedto determine whether choline or inorganic sulfate can reduce the requirement for methionine in practical-type diets for white. pekin duckings, while the second experiment was designed to study the interrelationship between methionine and choline levels growth performance, carcass traits and some blood constituents of white pekin duckings.