Age at which a JR can be taken from its mother and hand reared ?

by Angela
( Hawke's Bay, New Zealand)

At what age can a JR be taken from its mother and hand reared (as in the case of a runt that will only feed off the mother if assisted and so is very labour intensive already). Will the pup still thrive if share-fed by four people in the adoptive family, from three to four weeks? Pup is currently 10 days old.

Thank you,

Angela