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Egg quality, mechanical properties and Ultrastructural eggshell traits of Dumyati and Muscovy ducks were evaluated at beginning of laying period. A total of 100 fresh eggs were collected from 24 week-old Dumyati and Muscovy ducks fed a standard ration and reared under conventional management conditions. It was shown that average egg weight, egg width and egg shape index were higher in Muscovy eggs compared to Dumyati ones. Muscovy ducks produced significantly greater shell area when compared to Dumyati breed. The Muscovy eggs were significantly higher albumen height and quantity when compared to Dumyati eggs. With respect to breaking strength, it could be noticed that the breaking strength of Muscovy eggs were also significantly higher when compared to Dumyati breed. In accordance to eggshell ultrastructural, the present result showed that the Muscovy breed produced eggs with highly density mammillary pointed caps with irregular shape. Inversely, the Dumyati breed had low density rounded and conformity mammillary caps eggshells. Respecting confluence trait, data showed that the Muscovy eggs owned shells with higher values of confluence. With respect to alignment trait, the presented results showed that alignment comes out to be significantly differed between Muscovy and Dumyati breeds, where Dumyati eggs had the higher alignment value than Muscovy ones. Significant differences were found between Dumyati and Muscovy duck eggshells as for type B's structure. In conclusion, this study demonstrates the superiority for egg quality, mechanical properties and Ultrastructural eggshell traits of eggs from Muscovy ducks at beginning of laying period than Dumyati eggs.

COMPARATIVE STUDY ON THE MECHANICAL PROPERTIES AND ULTRASTRUCTURAL EGGSHELL TRAITS FOR DUMYATI AND MUSCOVY DUCKS