Abstract
Compositions of duck eggs of six breeds (Spot billed duck, Call duck, Khaki, Muscovy, Pekin andPhilippine) and the electrophoretic patterns of their yolks were compared.
The ratio of yolk/white were 0.53-0.67, the highest in Muscovy and the lowest in Pekin and much higher than those of hen's eggs. The chemical composition of egg white showed no difference among six breeds, but that of Muscovy yolk was very different from the other five breeds, higher in protein and lower in lipid. Duck eggs contained more sodium and potassium in white and more calcium and phosphorus in yolk, similar to hen's egg. Magnesium and calcium content of Muscovy yolk were much higher and potassium and sodium contents in Spot billed duck and Call duck were much lower than the others. SDS-polyacrylamide gel electrophoretic patterns of these duck egg yolks showed 22 bands and Muscovy yolk showed a quite different pattern from the others.
