Recent advances in reproductive technologies for animal breeding, toge
ther with improvements in techniques for storage of gametes and embryo
s, have encouraged the view that the time is now appropriate for devel
oping systematic policies of germplasm banking. Such activities would
aim to support more conventional breeding programmes for threatened sp
ecies, by providing the opportunity to store valuable genetic material
for use on some future occasion. A number of pertinent issues should
be addressed, however, before embarking upon the large scale implement
ation of genetic bank programmes. This review raises and discusses som
e of the issues involved.