| Variables | Number of Service per Conception | |
| N | LMS ± SE NSC | |
| Over all Mean | 320 | 1.60 ± 0.03 |
| Previous calving season |
| ns |
| Short rainy season | 80 | 1.55 ± 0.07 |
| Long rainy season | 116 | 1.61 ± 0.05 |
| Dry season | 124 | 1.65 ± 0.06 |
| Previous calving year |
| ns |
| 2013 | 63 | 1.60 ± 0.10 |
| 2014 | 126 | 1.64 ± 0.06 |
| 2015 | 131 | 1.58 ± 0.05 |
| Parity |
| ns |
| 2 | 87 | 1.62 ± 0.06 |
| 3 | 127 | 1.69 ± 0.06 |
| 4 | 72 | 1.55 ± 0.07 |
| 5 | 34 | 1.41 ± 0.09 |