Xenomorph Farmers also called "Bug Farmers" are Humans involved in the business of raising Xenomorphs on certain planets.
The reasons for the practice are never stated.
As seen by Col. Dr. Paul Church, the Xenomorphs raised by Farmers are often in very poor condition and lack a queen with which to truly direct them. These Queen-less false hives tend to die off in roughly a month. Farmers are overseen by a larger corporation, also unnamed.