出于动物福利的需要，许多国家对蛋鸡的饲养方式进行了改进。出现了改良型鸡笼饲养、大笼饲养、自由散养等三种替代模式。从传统的笼养转变为改良型笼养或散养等模式改变了鸡的生活环境，饲养方式的改变可能会改变蛋壳质量、蛋黄和蛋白的营养构成及功能，同时伴随着鸡蛋品质的变化。另外季节、品种、家禽的年龄以及免疫情况等的相互作用也会对鸡蛋品质有一定的影响。% In order to improve the welfare of hens,various housing systems were used in many countries which were enriched cage system,aviary system and free-range system.Changing from conventional cages to enriched cage or free-range systems affected the living environment of the laying hens.With the changing of housing systems,some characters of eggshell,nutritional composition and function of yolk and albumen might change,along with changes in egg quality.Season,hen breed,flock age,and flock disease-vaccination status also interacted to affect egg quality.
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