Pig production is increasing in the world. To meet the demand and the economics of production, pig operations are becoming larger.
Many operations are under a contract system, with integrators supplying feed, management advice and marketing channels.
Whole herd and year-round continuous production in confined, high-density, controlled environment facilities are becoming the most common production system.
At the same time, fly control has become more difficult. Each growing and finishing pig produces 18 tons of feces and urine per year. This does not include the large amount of water used in flushing systems for manure removal.
The large number of pigs and the large amounts of manure in a limited area create the potential for large amounts of fly breeding.