The incidence of Green Muscle Disease increases with higher market weight in broilers,
and more cases are reported in higher yielding crosses and in males. Increased broiler
activity induced by such factors as feed or water outages, lighting programs, catching
and live haul, and even excessive noise, may result in an increased incidence of Green
Muscle Disease. The increased activity associated with free-range broiler production has
resulted in an increase incidence of Green Muscle Disease in this industry.