| Birth type | Total ewe weight output (LW kg/ha) | Total lamb weight output (LW kg/ ha) | Total Net weight output (LW kg/ ha) |
| Single | 53.4 | 216.7B | 270B |
| Twin | 76.6 | 309.5A | 386A |
| Significance (P=) | 0.119 | 0.017 | 0.024 |
| RSD1 | 15.2 | 54.6 | 68.7 |