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Pup death rate in relation to the duration of the whelping from birth of the first pup in 168 litters (P < 0.0001)
| Duration of the whelping (hrs) | No. of litters | Stillborn pups/total no. of pups | Stillborn pups (%) |
| ≤ 5 | 84 | 20/481 | 4.2 |
| > 5 | 84 | 67/622 | 10.8 |
