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new returning rats quarantine time frame the absolute minimum quarantining for bringing rats in is 14 days this covers the acquisition of new rats or the return of resident rats to the colony after exposure to other rats shows co breeding returned placements etc
The rat attains sexual maturity early in life and the new born are dependent upon the mother, rats therefore have well developed nests with the new born being weaned after 3 - 4 weeks. The litter size does vary but an average litter size is 8 with approximately 6 litters per annum.he rat attains sexual maturity early in life and the new born are dependent upon the mother, rats therefore have well developed nests with the new born being weaned after 3 - 4 weeks. The litter size does vary but an average litter size is 8 with approximately 6 litters per annum.