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Table 2.

Various eggshell and chorioallantoic membrane (CAM) parameters in relation to different regions of the chick hen egg

CAM under air cell
Rest of the CAM
ParameterBlunt endMiddlePointed endReferencesN
Pore density (cm-2149 131 90 Rizzo (1899) 12 
Pore density (%) 100 88 60 Rizzo (1899) 12 
Eggshell area specific gas pressure permeability (%) 100 78  Romanoff (1943) 193 
Eggshell area specific water vapour diffusive conductance (%) 100 88 63 Rokitka and Rahn (1987) 35 
Pore density (%) 100 81 63 Rokitka and Rahn (1987) 35 
Respiratory quotient (day 19) 0.82 0.67  Seymour and Visschedijk (1988) 86 
Surface area (cm2), Sac, Sre (day 16) 13.2 62.8  Present study 74 
Total pore number 1970* 6935*  Present study 74 
Total blood vessels length, L (cm) (day 16) 2.92×103 9.83×103  Present study 74 
Total blood vessels length/total pores (cm pore-11.47 1.42  Present study 74 
CAM under air cell
Rest of the CAM
ParameterBlunt endMiddlePointed endReferencesN
Pore density (cm-2149 131 90 Rizzo (1899) 12 
Pore density (%) 100 88 60 Rizzo (1899) 12 
Eggshell area specific gas pressure permeability (%) 100 78  Romanoff (1943) 193 
Eggshell area specific water vapour diffusive conductance (%) 100 88 63 Rokitka and Rahn (1987) 35 
Pore density (%) 100 81 63 Rokitka and Rahn (1987) 35 
Respiratory quotient (day 19) 0.82 0.67  Seymour and Visschedijk (1988) 86 
Surface area (cm2), Sac, Sre (day 16) 13.2 62.8  Present study 74 
Total pore number 1970* 6935*  Present study 74 
Total blood vessels length, L (cm) (day 16) 2.92×103 9.83×103  Present study 74 
Total blood vessels length/total pores (cm pore-11.47 1.42  Present study 74 
*

For the pore number calculation, the values of the middle and pointed ends from Rizzo (1899) were averaged

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