Disease or impaired health can cause catastrophic losses; decreased survival or poor
feed conversion ratios. Regardless of which potential risk becomes problematic, each
has the same impact: an overall decline in the production of a marketable quality
product that then results in financial loss (McIntosh, 2008). Diseases can be prevented
only when the risks are recognised and managed before the diseases occur (Nowak,
2004). The severity of risks differs and will likely change depending on when each is
encountered during the production cycle.