5ASPINALL G 0,COTTRELL I W. Lemon-peel pectin. II . Isolationof homogeneous pectins and examination of some associatedpolysaccharides[J]. Canadian Journal of Chemistry, 1970,48(23):1283-1289.
6STADELMAN W J,COTTERILL O J. Egg science andtechnology[M]. New York: the Haworth Press Inc, 1995.
7PADRON M N. Salmonella typhimurium penetration through theeggshells of hatching eggs[J]. Avian Disease, 1990, 34(2): 463-468.
8ANA C A, ALOISO J A. Internal quality of eggs coated with wheyprotein concentrate[J]. Science and Agriculture, 2004, 61(52):276-280.
10FUNK E M. The relation of the yolk index determined in naturalposition to the yolk index as determined after separating the yolk formalbumen [J]. Poultry Science, 1948, 27(18): 367.
