Table 3.
Effects of three different dietary protein levels on growth performance of twin lambs.
| Parametera | Treatments | P-value | ||
|---|---|---|---|---|
| LP (n = 24) | MP (n = 20) | HP (n = 30) | ||
| 0–7d | ||||
| Initial BW, kg | 3.80 ± 0.11b | 3.99 ± 0.11b | 4.38 ± 0.13a | 0.01 |
| Final BW, kg | 5.84 ± 0.14b | 6.09 ± 0.16ab | 6.42 ± 0.15 a | 0.03 |
| ADG, g/d | 292 ± 12.2 | 300 ± 11.5 | 292 ± 13.3 | 0.88 |
| 7–14d | ||||
| Initial BW, kg | 5.84 ± 0.14b | 6.09 ± 0.16ab | 6.42 ± 0.15 a | 0.03 |
| Final BW, kg | 7.34 ± 0.16 | 7.60 ± 0.20 | 7.91 ± 0.19 | 0.12 |
| ADG, g/d | 214 ± 9.30 | 215 ± 12.75 | 214 ±8.00 | 0.99 |
| 14–30d | ||||
| Initial BW, kg | 7.34 ± 0.16 | 7.60 ± 0.20 | 7.91 ± 0.19 | 0.12 |
| Final BW, kg | 10.2 ± 0.23 b | 10.3 ± 0.28ab | 11.0 ± 0.26 a | 0.05 |
| ADG, g/d | 175 ± 6.76 | 171 ± 10.41 | 195 ± 9.54 | 0.16 |
| 30–60d | ||||
| Initial BW, kg | 10.3 ± 0.23 b | 10.3 ± 0.28ab | 11.0 ± 0.26 a | 0.05 |
| Final BW, kg | 17.5 ± 0.44 | 19.2 ± 0.75 | 19.3 ± 0.46 | 0.06 |
| ADG, g/d | 245 ± 10.62 | 297 ± 17.73 | 277 ± 11.68 | 0.06 |
| 60–180d | ||||
| Initial BW, kg | 17.5 ± 0.44 | 19.3 ± 0.75 | 19.3 ± 0.46 | 0.06 |
| Final BW, kg | 38.6 ± 1.12 | 40.8 ± 1.59 | 43.3 ± 1.39 | 0.08 |
| ADG, g/d | 176 ± 7.43 | 180 ± 8.74 | 200 ± 9.76 | 0.14 |
| 0–180d | ||||
| Initial BW, kg | 3.80 ± 0.11b | 3.99 ± 0.11b | 4.38 ± 0.13a | 0.01 |
| Final BW, kg | 38.6 ± 1.12 | 40.8 ± 1.59 | 43.3 ± 1.39 | 0.08 |
| ADG, g/d | 193 ± 8.62 | 205 ± 8.62 | 217 ± 7.49 | 0.12 |
Values are expressed as means ± standard deviation.
a
BW, body weight; ADG, average daily gain. Values in the same raw of the same item with different superscripts differ significantly (P < 0.05) and the same letter or no letter differs insignificant difference (P > 0.05).