Also watch out for dog foods that contain certain red dyes (red # 40 I think) as this might cause problems with your rats. Pedigree is one of those dog kibble's that contains red #40.
You can give the female a break if you want. I intend to give my girls breaks once my colony is big enough. You can give them a 2-3 week break after they wean the babies. This gives them enough time to put some weight on and recover from the litter. If you want to give her a break, pull the male BEFORE she gives birth. Female rats can become pregnant again within 24 hours of giving birth.
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