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House fly breeding has commercial potential the Forum has not yet detailed. One production issue to consider is detailed in (2011) "Effect of the size of the pupae, adult diet, oviposition substrate and adult population density on egg production in Musca domestica (Diptera: Muscidae)", by Pastur, et. al originally published in European Journal of Entomology 108; free full pdf = http://www.eje.cz/pdfs/eje/2011/04/12.pdf