Table-4.
Effect of heat and cold exposures for 4 days (post-hatch days 21-25) on the morphology of jejunum in broiler chickens subjected to thermal manipulation (TM) during embryogenesis (n=3).
| Day 4 of stress | Jejunum | |||||
|---|---|---|---|---|---|---|
| VH (µm) | VW (µm) | VSA (µm2) | CD (µm) | VH:CD(µm) | ||
| TN | Control | 835.41 ± 24.03a | 153.66 ± 7.13 | 403212 ± 22679.3a | 148.72 ± 8.37ac | 5.65 ± 0.3ac |
| TML | 800.59 ± 43.99a | 140.32 ± 18.18 | 352530 ± 46415a | 173.25 ± 8.02abc | 4.63 ± 0.21a | |
| TMH | 971.91 ± 40.86ac | 135.24 ± 2.87 | 413384 ± 25910a | 192.64 ± 29.63abc | 5.28 ± 0.78a | |
| CHS | Control | 888.19 ± 59.23ac | 147.3 ± 1.4 | 411339 ± 31237a | 202.1 ± 7.75abc | 4.39 ± 0.13a |
| TML | 832.8 ± 46.03ac | 153.91 ± 19.74 | 397870 ± 34897a | 228 ± 29.01ab | 3.73 ± 0.32a | |
| TMH | 1111 ± 76.38bc | 145.78 ± 18.89 | 500007 ± 38234ac | 205.46 ± 11.27abc | 5.4 ± 0.08a | |
| CCS | Control | 1115.71 ± 54.7bc | 170.36 ± 22.87 | 604126 ± 111257ab | 240.31 ± 10.33b | 4.66 ± 0.33a |
| TML | 1305.68 ± 86.43b | 198.41 ± 6.19 | 812706 ± 55858b | 166.17 ± 15.25abc | 8.03 ± 1.04bc | |
| TMH | 1270.03 ± 6.04b | 175.36 ± 10.74 | 699161 ± 41537bc | 137.41 ± 1.69c | 9.25 ± 0.15b | |
TN: thermal neutral. CHS: chronic heat stress. CCS: chronic cold stress. VH: villus height. VW: villus width. VSA: villus surface area. CD: crypt depth. VH:CD: villus height to crypt depth ratio. a-cwithin the same column, means ± SEM with different superscripts are significantly different (p<0.05)