Security concerns for consumers to genetic engineering in animals like cows, pigs, chickens and other animals to obtain recombinant growth hormone may cause the quality to do the same in nature. And may contain residues Without clear confirmation of this. The physiology of the system is more complex than either of the plants and microorganisms. There may be other effects Unexpected from genetically engineered animals. Which may contain toxic chemicals that do not want to be left behind. Made of genetically engineered animals as food directly. Require consideration of procedures to evaluate the safety cover over the genetic engineering of plants and microorganisms.