“In a no-mules environment, with Merino sheep of existing genetics, increased chemical use and flock inspections could theoretically keep flystrike rates to approximately equivalent levels in some production systems. If producers were able to sufficiently increase anti-flystrike inputs, then the welfare of Merino sheep in a no-mules environment would probably be equivalent or better to that of today. If real world constraints such as property size or finances result in a sub-optimal level of flystrike prevention and treatment, then animal welfare will unquestionably be worse.” (Lee & Fisher, 2007, p.4)