Another new product unveiled at the ESHRE conference could allow women to freeze their eggs so that they can become pregnant at a time of their choosing. Dr Masashige Kuwayama, of the Kato Ladies Clinic in Tokyo, says that a technique first used for cattle and sheep might lead to a dramatic improvement in success rates for pregnancies from frozen eggs. Existing techniques result in a pregnancy with only 1 in 100 eggs. The Japanese method, which uses a kind of antifreeze to keep ice crystals from forming in the egg, will increase this rate to 10 in 100.