Table 2.
Mortality rates of the newborn pups until weaning.
| Group | Diet (NaCl, w/w) | Rats born (mother∗) |
Survival rate during lactation | ∗∗Statistics | ||||
|---|---|---|---|---|---|---|---|---|
| Matching | Pregnant | Alive (%) | Dead (%) | χ 2 | P | Versus | ||
| MHPR | 4% | 0.75% | 52 (7) | 35 (67) | 17 (33) | |||
| MLPR | 0.3% | 0.75% | 35 (4) | 19 (54) | 16 (46) | 1.51 | 0.21 | MHPR |
|
| ||||||||
| MRPR | 0.75% | 0.75% | 59 (7) | 39 (66) | 20 (34) | 0.02 | 0.89 | MHPR |
| 1.30 | 0.25 | MLPR | ||||||
| 26.82 | 0.00 | MRPH | ||||||
| 0.05 | 0.82 | MRPL | ||||||
|
| ||||||||
| MRPH | 0.75% | 4.0% | 113 (11) | 107 (95) | 5 (5) | |||
| MRPL | 0.75% | 0.3% | 53 (6) | 34 (64) | 19 (36) | 19.88 | 0.00 | MRPH |
MHPR: mothers fed the high-salt diet during mating period and the regular chow during pregnancy period; MLPR: mothers fed the low-salt diet during mating period and the regular chow during pregnancy period; MRPR: mothers fed the regular chow during mating period and during pregnant period; MRPH: mothers fed the regular chow during mating period and the high-salt diet pregnancy period; MRPL: mothers fed the regular chow during mating period and the low-salt diet during pregnancy period. Rats born: the total number of newborn pups; alive: the number of rats that were alive until weaning; dead: the number of rats that died before weaning. ∗: mothers that delivered babies. ∗∗The differences in alive pups were assessed by χ 2 test (df = 1). 0.75% NaCl (w/w) chow (regular chow) is usually used for maintaining rat colonies.