To obtain axenic pups, the hysterectomy on the donor female is best done how many hours prior to natural parturition?

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Multiple Choice

To obtain axenic pups, the hysterectomy on the donor female is best done how many hours prior to natural parturition?

Explanation:
Delivering axenic pups requires them to be born into a completely sterile environment, avoiding exposure to the dam's microbiota during birth. Performing the hysterectomy about 6–8 hours before natural parturition provides the right balance: it gives enough lead time to complete sterile surgical handling and transfer, while still allowing the fetuses to be sufficiently mature to survive and be delivered outside the uterus. This timing minimizes early microbial exposure, and the pups can then be transferred immediately into a sterile isolator for ongoing axenic rearing. If done too early, viability and timely delivery can be compromised; if done too late, the pups would be exposed to maternal microbiota during birth.

Delivering axenic pups requires them to be born into a completely sterile environment, avoiding exposure to the dam's microbiota during birth. Performing the hysterectomy about 6–8 hours before natural parturition provides the right balance: it gives enough lead time to complete sterile surgical handling and transfer, while still allowing the fetuses to be sufficiently mature to survive and be delivered outside the uterus. This timing minimizes early microbial exposure, and the pups can then be transferred immediately into a sterile isolator for ongoing axenic rearing. If done too early, viability and timely delivery can be compromised; if done too late, the pups would be exposed to maternal microbiota during birth.

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