TABLE 1.
Crosses used to determine the correction factors for reproductive performance in interspecific and intersubspecific crosses
| Type of cross | Dam | Sire | Average litter sizea | SD | No. of litters | References |
|---|---|---|---|---|---|---|
| Intersubspecific | (C57BL/6 × CASP)F1 | CASP | 7.3 | 1.20 | 9 | Zhao et al. (2002) |
| (C57BL/6 × MOM)F1 | C57BL/6 | 6.3 | 1.66 | 11 | Zhao et al. (2002) | |
| (C57BL/6 × MOM)F1 | MOM | 7.1 | 1.73 | 12 | Zhao et al. (2002) | |
| (CAST × C57BL/6)F1 | C57BL/6 | 8.27 | 1.57 | 66 | This study | |
| C57BL/6 | (C57BL/6 × CASP)F1 | 7.9 | 1.44 | 13 | Zhao et al. (2002) | |
| C57BL/6 | (C57BL/6 × MOM)F1 | 7.3 | 2.71 | 15 | Zhao et al. (2002) | |
| C3H | (C3H × MOM)F1 | 8 | 1.32 | 7 | Zhao et al. (2002) | |
| Subtotal | 7.45 (1.29) | |||||
| Hybrid | (C57BL/6 × SKIVE)F1 | C57BL/6 | 8.74 | 1.79 | 39 | This study |
| Subtotal | 8.74 (1.09) | |||||
| Intrasubspecific | (PERA × C57BL/6)F1 | C57BL/6 | 9.9 | 0.94 | 11 | This study |
| (C57BL/6 × PERA)F1 | C57BL/6 | 10.04 | 1.95 | 104 | This study | |
| (C57BL/6 × PERC)F1 | C57BL/6 | 8.9 | 2.33 | 50 | This study | |
| Subtotal | 9.61 (1) |
a
The correction factors for interspecific and hybrid crosses are the ratio between the average litter size in intrasubspecific crosses and the average litter size in intersubspecific and hybrid crosses, respectively, and are shown in parentheses.