Microinjection for transgenic animals is a method where the foreign DNA transfers into the animals. A transgenic animal is one whose genome has been altered by the transfer of the genes from another species or breed. Tests of Microinjection for transgenic animals are routinely held in the laboratory and research centers. These animals are most commonly created by the microinjection of DNA into the pronuclear of a fertilized egg. The insertion of DNA is a random process, and there is a high probability that the introduced gene will not insert itself into a site on the DNA, as that will permit its expression. In this process, the manipulated fertilized ovum is been transferred into the oviduct of the foster mother. And that has been induced to act as a recipient by mating with a vasectomized male. Transgenic animals are being explored as a means to produce large quantities of complex human proteins for the treatment of human disease.