الفهرس 
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Abstract
This study was done at Poultry Farm, Faculty of Veterinary Medicine, Zagazig University during the period from the tenth of April to the three of July 2022. Eighty ducks were used in this experiment (20 Pekin, 20 Star 53, 20 Muscovy, and 20 Mulard ducks). Each breed was maintained as a separate group, divided into four replicates with five ducks / m2. All duck breeds were reared under the same environmental, managerial, and hygienic conditions from one day old until the end of experiment (12th week of the age) to study the effect of breeds on growth performance, carcass traits, hematological and biochemical parameters, Meat quality of breast and thigh. Furthermore, gene expression of growth hormone (GH), insulin like growth factor 1 (IGF1), and calpain gene in breast muscles.