They shouldn't leave until they are at least 8 weeks old and have their first set of vaccinations from the vet. They should also be wormed by the vet.
between 5-6 weeks of age. After 5 weeks the male and females should be separated because they can already reproduce
For males they leave at 4 weeks , Females leave at 5 to 6 weeks
A Month or 5weeks
than you buy the mother rat but if the baby rats are young than get them all. that way you have a mother rat and baby rats to look after.
So long as those baby rats are all boys, yes, but it should be taken slowly, as some adult males will kill baby rats.
after growth
no
after a year, when the next baby is born
They never leave their mother, their mother is the queen of the colony and they stay with that colony their entire life
Yes, when rats are born they each come attached to their own placenta, which the mother then licks off and eats. There is one placenta for each baby rat, but if the mother rat doesn't expel the placenta it can rot inside her and make her sick even to the point of death. Baby rats are connected to their placenta by their umbilical cord. Sources: I breed and research rats=)
Rats have about 6 to 18 babies every 23 days unless you sperate them, i recommend it, because its a lot on the mother.
it can leave 6-8 weeks
They never leave them. They stay together until death.
At about 5-6 weeks, you can take them away from their mother and sell them. I wouldn't leave them any longer then that or they can start breeding with each other.
The baby mouse can leave it's mother when it's about four weeks or older. At that time, the baby mouse is fully weaned of mother's milk. The baby mouse should also be eating solid foods as well.