6Nys Y, Hincke M T,Arias T L,et al. Avian eggshell miner- alization[J]. Poultry Avian Biology Reviews, 1999,10:143-166.
7Fink D J, Caplan A I, Heuer A H. Eggshell mineralization: a case study of a bioprocessing strategy[J]. MRS Bulletin,1992, 10:27-31.
8Hamilton 1： M G. Methods and factors that affect the mea- surement of eggshell quality[J]. Poultry Science, 1982, 61: 2022-2039.
9Ahn D U,Kim S M,Shu H. Effect of egg size and strain and age of hens on the solids content of chicken eggs[J]. Poul- try Science, 1997,76:914-919.
10Akbar M K,gavora J S,Friars G W,et al. Composition of eggs by commercial size categories:effects of genetic group,age, and diet[J]. Poultry Science, 1983,62:925-933.
