| Age at first calving | N | Mean ± SE | 95% confidence interval | |
| Lower Bound | Upper Bound | |||
| Agro-ecology |
|
|
|
|
| Highland | 64 | 41.04 ± 0.48 | 37.300 | 39.225 |
| Midland | 62 | 42.54 ± 0.50 | 38.243 | 40.223 |
| Lowland | 40 | 46.24 ± 0.59 | 44.396 | 46.754 |
| Sig. |
| 0.488 |
|
|
| Breed |
|
|
|
|
| Local | 120 | 46.73 ± 0.30b | 46.140 | 47.326 |
| Cross breed | 46 | 31.41 ± 0.53a | 30.369 | 32.461 |
| Sig. |
| 0.000 |
|
|
| Agro-ecology*breed |
|
|
|
|
| Sig. |
| 0.062 |
|
|
| Overall | 166 | 40.63 ± 0.26 | 40.167 | 41.199 |