8JONES D R, THARRINGTON J B, CURTIS P A, et al. Effects of cryogenic cooling of shell eggs on egg quality[J]. Poult Sei, 2002, 81 (5): 727-733.
9GAST R K, BEARD C W. Production of Salmonella enteritidis- contaminated eggs by experimentally infected hens[J]. Avian Dis, 1990, 34(2): 438-446.
10HUMPHREY T J, WHITEHEAD A, GAWLER A H, et al. Numbers of Salmonella enteritidis in the contents of naturally contaminated hens' eggs[J]. Epidemiol Infect, 1994, 106(3): 489-496.