New Blood lines

[Haydenphoto]

I've heard you never add ASFs to an established social group, that it always results in them killing the new rat.

They where not in a social group i have the males and females in diff cages i just took 9 females from both blood lines and put them with a male ! But one of the females was going to have a litter so im not sure if thats where the fighting started ? I have been breeding them for almost 2 years and this is the first time i have ever had an issue just hope its my last issue. Only bad thing for my 1.9 i have to let a male baby take over now so looks like that tank is on hold for having litters for a while