In vitro fertilization (IVF) is used clinically in livestock. The recovered oocytes are subjected to in vitro maturation then fertilized in vitro, and the resulting embryos are cultured in vitro to the blastocyst stage, at which point they are transferred transcervically to the uteri of recipient. In recent years the IVF technology has revolutionized the field of animal biotechnology because of production of more and more animals as compared to animal production through normal course. These are used only to serve as animal incubator and to deliver offsprings after normal gestation period.