Determining halachic parentage

Harav, Dr. Halperin
 I understand that at a recent conference, that it was announced that current halachic thinking, favors the egg donor as the halachic mother.  I understand from our previous correspondence, that you have advocated that both the egg donor and birth mother should both be Jewish, and likewise the PUAH organization has followed this ruling. Other authorities considered the birth mother being Jewish was sufficient.
 I would now like to check with you, the status of the birth mother.  The Surrogacy legislation in Israel requires that the birth mother is Jewish.  Is this still advocated for Jewish women seeking surrogacy abroad?
 Do you still consider that both the birth mother and egg donor, need to be Jewish or now just the egg donor?
 The major issue is obviously one of registration of egg donors.
 Thank you
Julia Feuer
Lecturer in law