Table 1.
Descriptive statistics of female fertility traits in a Chinese Holstein population
| Traita | N | Mean | SD | Minimum | Maximum |
|---|---|---|---|---|---|
| IFLh | 88,647 | 32.1 | 69.2 | 0 | 365 |
| CRh | 88,647 | 0.626 | 0.484 | 0 | 1 |
| AISh | 88,647 | 1.742 | 1.286 | 1 | 8 |
| NRR56h | 88,647 | 0.732 | 0.443 | 0 | 1 |
| ICF | 126,985 | 82.1 | 37.3 | 20 | 230 |
| DO | 126,985 | 161.6 | 104.9 | 20 | 595 |
| IFLc | 126,985 | 79.5 | 100.1 | 0 | 365 |
| CRc | 126,985 | 0.356 | 0.479 | 0 | 1 |
| AISc | 126,985 | 2.777 | 1.994 | 1 | 8 |
| NRR56c | 126,985 | 0.584 | 0.493 | 0 | 1 |
a IFL interval from first to last insemination, CR conception rate at first insemination, AIS number of inseminations per conception, NRR56 non-return rate at 56 days after first insemination, ICF interval from calving to first insemination, DO days open. For traits expressed in both heifers and cows, a suffixes h (for heifers) or c (for cows) was attached to the trait abbreviations