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 . | . | . | . | |
|---|---|---|---|---|---|---|
| Parameter . | Blunt end . | Middle . | Pointed end . | References . | N . | |
| Pore density (cm-2) | 149 | 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-1) | 1.47 | 1.42 | Present study | 74 | ||
| . | CAM under air cell . | Rest of the CAM . | . | . | . | |
|---|---|---|---|---|---|---|
| Parameter . | Blunt end . | Middle . | Pointed end . | References . | N . | |
| Pore density (cm-2) | 149 | 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-1) | 1.47 | 1.42 | Present study | 74 | ||
For the pore number calculation, the values of the middle and pointed ends from Rizzo (1899) were averaged