An IVF system for successfully utilizing spermatozoa separated into
X-chromosome bearing and into Y-chromosome bearing population for
insemination. The IVF system includes fertilization medium that can
shorten the time from insemination to cleavage and a portable incubator
for the transportation of maturing oocytes and inseminated oocytes
comrprising a straw (19) and an incubation element (20) that can be
sealed with a cap (22).