Breeding planet

A breeding planet was a planet utilised by a spacefaring species for the sole function of procreation.

The Adipose maintained breeding planets known as nursery worlds, (PROSE: Time Traveller's Diary) as their young were created parasitically by injecting seed into animals. Adipose 3 was such a planet, and after it was lost they tried to convert Earth into one. This attempt failed, though many Adipose children were created. (TV: Partners in Crime)

Andromeda Gamma Epsilon was used for the Wirrn's breeding colonies until they were destroyed by human colonists. (TV: The Ark in Space)

The Sontarans maintained breeding planets to clone millions of their kind. They also attempted to convert Earth into a breeding planet, through the use of ATMOS gas, but failed. (TV: The Poison Sky)