To minimize contamination these storage boxes are tightly sealed to prohibit the effects of weather and to prevent leakage. Loading and unloading is easily accomplished through various door arrangements. Birds are added in a single layer to ensure that all the carcasses freeze properly. Stacking or overloading prevents complete freezing of carcasses and should be avoided. Beyond placing carcasses in the freezer as they are collected daily, there is little labor involved.
Processing can take place at the end of each growing cycle or as needed.
Ideally, freezer units will have no environmental or health impacts and will operate for 10 years. Transfer of pathogens or harmful microorganisms between farms may be a problem with this method of collection. However, freezing is useful as a way to reduce or eliminate pollution and improve conditions on the farm. Additional research will more fully explore this management option and any problems with transfer of pathogens between farms. Fermentation Fermentation may also become a more widespread method for holding poultry carcasses for up to 3 months until their valuable nutrient components can be recovered by rendering.