Silkworm (Bombyx mori) cryopreservation: embryonic development as revealed by microscopic studies.

Embryo cryopreservation offers a way to safeguard against unwelcome mutations and inadvertent selection that can change its unique genetic makeup. Having a genetic repository of the silkworm genetic resources would ensure preservation of original genetic makeup and will permit to study what genes may have been lost in the selection process. For cryopreservation of eggs and embryos of silkworm, the determination of embryonic stages is a prerequisite. This study reports microscopic observations on embryonic development. The embryonic stages in the dechorionated eggs were determined in parallel comparison with the embryos isolated from intact eggs of different developmental ages.