Bunnylady
Herd Master
IMO, if that second litter is to survive, the first litter will need to be removed from the cage. Otherwise, she will nurse the more active, aggressive, older ones, and the second litter will probably starve. It's pretty unlikely that she would choose to visit them both, and equally unlikely that the older kits would stay out of the nest where the new kits are. If she does try to refuse the older kits, there's a good chance the new ones could get trampled.
We prefer not to separate at 4 weeks, but commercial breeders do it all the time. Buns this age should be eating and drinking a fair amount on their own; if you add some rolled oats and maybe a little calf manna to their pellets, they should be OK.
I've had emergency situations that resulted in litters as young as 3 weeks being on their own, and they survived. Not what I'd prefer, but sometimes, needs must.
And actually, it's not the sperm they store, it's the embryos - it's a little-known trick called "delayed implantation." The longest case on record was something like 6 months.
But let me ask this: are you sure you got the buck out before the older litter was born? Does come into use (are capable of getting pregnant again) immediately after a litter is born. If he was there when the kits were born, this is a straightforward case of rebreeding after kindling, not anything more exotic.
We prefer not to separate at 4 weeks, but commercial breeders do it all the time. Buns this age should be eating and drinking a fair amount on their own; if you add some rolled oats and maybe a little calf manna to their pellets, they should be OK.
I've had emergency situations that resulted in litters as young as 3 weeks being on their own, and they survived. Not what I'd prefer, but sometimes, needs must.
And actually, it's not the sperm they store, it's the embryos - it's a little-known trick called "delayed implantation." The longest case on record was something like 6 months.
But let me ask this: are you sure you got the buck out before the older litter was born? Does come into use (are capable of getting pregnant again) immediately after a litter is born. If he was there when the kits were born, this is a straightforward case of rebreeding after kindling, not anything more exotic.