Table 6.
Effect of body weight categories on physiological response of commercial layers
| Parameters | Body weight | |||
|---|---|---|---|---|
|
| ||||
| Light | Medium | Heavy | p-value | |
| Physiological response at 20 week age | ||||
| RT (°C) | 40.33±0.28 | 40.74.33±0.31 | 40.61±0.19 | 0.4184 |
| HBR (beat/min) | 271.30±4.51 | 270.30±4.65 | 284.80±0.40 | 0.1292 |
| RR (breath/min) | 19.40±0.81 | 20.80±0.42 | 19.30±0.87 | 0.2796 |
| Physiological response at 50 week age | ||||
| RT (°C) | 39.7860±0.24a | 38.89±0.32b | 38.33±0.32c | 0.0002 |
| HBR (beat/min) | 314.00±7.48a | 273.00±5.39b | 258.80±3.31b | <0.0001 |
| RR (breath/min) | 22.80±0.37a | 18.60±0.40b | 17.20±0.37c | <0.0001 |
RT, rectal temperature; HBR, heartbeat rate; RR, respiratory rate.
a–c
Means within a row with different superscripts differ (p≤0.05).