LAYER FEED COMPOSITION CONTAINING POWDERED SHELL OF ASCIDIAN FOR ENHANCING CAROTENOID CONTENT OF EGGS AND STRENGTH OF EGGSHELL, PREPARATION METHOD THEREOF AND SPECIAL EGGS PRODUCED THEREBY

摘要

PURPOSE: A method for preparing a layer feed composition containing powdered shell of ascidian is provided to enhance the carotenoid content of eggs and the strength of eggshell. CONSTITUTION: The method includes the following steps of: (i) washing and dewatering collected shells of ascidian to remove impurities and the surface water from the shell; (ii) soaking the clearly treated shell of ascidian in an organic solution of which concentration is from 1 to 12 and pH is 1.5-3.0; (iii) dewatering and dehydrating the soaked shell and pulverizing the dried shell into a fixed granule size of at least 50mesh; and then (iv) adding at least 6wt% of the powdered ascidian shell to a normal layer feed composition.