At the beginning of the 1990s, co-culture of cattle and sheep embryos was the most favoured
method to support embryo development, but the use of this system has hampered progress
in raising the efficiency of embryo production. Furthermore, little was known of the
requirements of embryos and the biochemistry of early embryo development. As the decade
progressed, energy metabolism studies improved our understanding of the energy substrate
requirements for embryo development. Furthermore, an appreciation of the reproductive …