How transgenic animals that produce useful products can be created?

Explanation

The animals which carry foreign genes are called transgenic animals.
Production of Transgenic Animals. The foreign genes are inserted into the genome of the animal using recombinant DNA technoogy. The production of transgenic animals includes- (i) Location, identification and separation of desired gene. (ii) Selection of proper vector (generally a virus) of direct transmission (iii) Combining the desired gene with the vector . (iv) Introduction of transferred vectors in cell , tissues embryo or mature individual . (v) Demonstration of intergration and expression of foreign gene in transgenic tissue or animals.