Table 1. Breeding performance of each female F344/N rat over the life span.
| Individuals | Life span | Age at first delivery (fertility) |
Age at last delivery |
Breeding duration1) | No. of deliveries |
Average litter size | Weaning rate (%)2) |
Cannibalism / Non-nursing |
|---|---|---|---|---|---|---|---|---|
| 1 | 30.5 | 2.9 (2.2) | 15.9 | 13.7 | 9 | 9.7 | 98.5 | 2 / 0 |
| 2 | 30.9 | 3.0 (2.3) | 15.6 | 13.3 | 9 | 7.4 | 97.0 | 0 / 0 |
| 3 | 19.5 | 2.9 (2.2) | 15.5 | 13.3 | 13 | 7.8 | 89.5 | 2 / 1 |
| 4 | 27.3 | 2.8 (2.1) | 15.2 | 13.1 | 13 | 6.9 | 89.5 | 2 / 2 |
| 5 | 22.8 | 3.1 (2.4) | 14.2 | 11.9 | 12 | 6.8 | 96.0 | 1 / 1 |
| 6 | 21.5 | 2.7 (2.0) | 16.9 | 14.9 | 16 | 7.0 | 95.9 | 2 / 1 |
| 7 | 30.2 | 3.0 (2.3) | 17.5 | 15.2 | 8 | 5.3 | 93.8 | 2 / 1 |
| 8 | 25.9 | 3.0 (2.3) | 16.7 | 14.4 | 10 | 6.6 | 93.9 | 0 / 0 |
| 9 | 16.4 | 2.8 (2.1) | 13.0 | 10.9 | 7 | 6.6 | 91.3 | 0 / 0 |
| 10 | 30.4 | 3.1 (2.4) | 13.9 | 11.5 | 8 | 8.1 | 75.4 | 1 / 1 |
| 11 | 16.9 | 2.9 (2.2) | 11.2 | 9.1 | 9 | 6.2 | 98.2 | 0 / 1 |
| Mean | 24.7 ± 5.6 | 2.9 ± 0.1 (2.2 ± 0.1) | 15.1 ± 1.8 | 12.8 ± 1.9 | 10.4 ± 2.8 | 7.1 ± 1.1 | 92.6 ± 6.5 | |
1)Duration between the age at first pregnancy and the last delivery. 2)Delivery with cannibalism was excluded. Age and duration is shown in months (M).