The act of Copulation in animals is sometimes called breeding.
Breeding refers to the vocation of propagating a particular Breed in the Hobby of Animal Fancy .
In Engineering , a Breeder Reactor is a type of Nuclear Reactor whose fuel does not occur naturally but must be produced or ''bred'' within the reactor from some other material. A Fusion Power plant is also a type of breeder reactor because it must produce its tritium fuel from lithium.
