Deadstock Disposal Options for On-Farm
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Dealing with livestock mortalities is an inevitable part of raising livestock. Livestock producers regularly review their production and handling practices to reduce the incidence of livestock mortality. Nevertheless, death is inevitable, and livestock producers must equip themselves with knowledge, proper planning and the technology necessary to deal with dead farm animals (deadstock).
Disposal and management options are outlined fully in Ontario Regulation 106/09 under the Nutrient Management Act, 2002, which includes standards designed to protect the environment and the food supply. They include:
There are several things to consider when determining which disposal option to choose:
Ensure that whatever option is chosen is compliant with all legal requirements. Remember that there are federal regulations governing the transport, storage and disposal of dead cattle.
Ontario Regulation 106/09 under the Nutrient Management Act, 2002, applies to the following farm animals (and their hybrids) if they are bred, produced, raised or kept by a person who owns or operates a farm operation, producing food or animal products:
It also applies if the animals are kept for the person's personal use or boarded by that person.
Dispose of all deadstock within 48 hr of its death or immediately, if it begins to putrefy before 48 hr have passed. These timelines may be extended if the deadstock is held for post-mortem or loss adjustment. Deadstock may also be stored in cold storage for up to 14 days and in frozen storage for up to 240 days before disposal.
Figure 1. This drawing shows a storage/pick-up area for deadstock. Note that the site is out of public view.
Each on-farm disposal option has specific requirements under the regulation. Review the requirements, consider your management practices and choose the appropriate method for your farm operation.
Deadstock may be picked up on the farm or delivered to the collector or to a common container, where deadstock from multiple farms are temporarily stored for pick-up. Common containers increase the efficiency of collection services. Movements of bovine carcasses, as well as certain treatment activities, require federal Specified Risk Material (SRM) permitting.
Store any deadstock awaiting pick-up so that it is concealed from public view (Figure 1), and so that any liquids from the animal cannot escape onto the ground. Not only does improper storage of dead farm animals result in complaints from the public, it may attract scavengers and predators and pose biosecurity risks for the farm.
There are areas of the province where no collection service is offered, and there are some species of livestock that are not picked up in some areas of the province. Compare the costs of collection to the operational and management costs of on-farm disposal.
Figure 2. Turning a composting pile consisting of dead poultry mixed with substrate.
On-farm composting can provide an excellent source of organic matter and nutrients through land application. Proper composting kills pathogens and stabilizes the organic and nutrient content of the finished compost. Composting done improperly can result in odours, scavenging and potentially negative environmental impacts.
Federal regulations govern the transport and disposal of composted dead cattle off the site of the animals' death. Please refer to the Canadian Food Inspection Agency for more information.
The availability and price of substrate may affect the choice to compost deadstock. The allowed substrates are:
Because the site must be accessible year-round, the volume and size of the deadstock to be composted will affect the choice of location. The site must not be more than 600 m2, and each composting site should not contain more than 600 m3 of deadstock and substrate (Figure 2). Multiple outdoor sites can be established with a 100-m setback between them to reduce the cumulative impact of leaching.
Figure 3. Three-bin composting system.
Composting is considered complete when there is:
Figure 4. Windrow composting system.
Figure 5. In-vessel composting system.
Incinerators are a viable option for the disposal of smaller species. Incinerators used for deadstock disposal must have a Verification Certificate issued by the Environmental Technology Verification Program (ETV Canada), certifying that it has a secondary chamber that is capable of maintaining the gases that enter it from the primary chamber at 1,000°C or higher for at least 1 second, or 850°C or higher for at least 2 seconds. High temperatures in the secondary chamber will decrease the contaminants in the emissions. Figure 6 shows an example of a commercially available unit.
Figure 6. Incinerator with a secondary chamber.
Figure 7. In-ground disposal vessel, with vent pipe and open hatch.
Disposal vessels were developed in response to predation problems on sheep farms. They are an inexpensive and non-labour-intensive method of disposing of smaller-sized deadstock. Disposal vessels may be useful for farms with few or inconsistent livestock mortalities.
Locate a leakproof and impervious container either on the ground surface, partially buried or fully buried in the ground. Position a hatch on the vessel in such a way that deadstock can be easily deposited into the vessel (Figure 7). A vent or duct allows insects to enter and aid the decomposition, while restricting access to scavengers.
A vessel's capacity, the volume of deadstock put into it and the rate of filling determine how long it can be used. Decomposition will allow its continued use over many years. When the the disposal vessel is no longer needed, fill it with soil and close the hatch.
Under the new regulation, standards for burial pits have been expanded to protect ground- and surface water and prevent scavenging. The new standards require that deadstock placed in a burial pit be covered with a least 0.6 m of soil at all times while the burial pit is open (Figure 8). Burial is not permitted in areas where the bottom of the burial pit is less than 0.9 m above bedrock or an aquifer.
Figure 8. Digging a burial pit using a backhoe.
A maximum of 2,500 kg of deadstock is allowed per burial pit, measured immediately before burial. Multiple burial pits on the same site are permitted, provided there is adequate separation distance between them to reduce the risk of groundwater contamination through leaching.
The regulation requires that the burial pit be monitored regularly for 1 year following the date that it is closed to ensure that the ground does not sink or show evidence of scavenging. Should this occur, pile additional soil on the area. When the burial pit is closed, mound the ground over the pit to facilitate runoff of precipitation.
The burial option is more difficult when the ground is frozen.
Every part of a burial pit must be at least 6 m from a field drainage tile. If the pit is 615 m from a drainage tile, the dead animals must be placed lower in the pit than the lowest point of the tile.
Farmers may also choose to dispose of deadstock in an anaerobic digester. Any anaerobic digester must be:
Costs may include tipping charges for use of anaerobic digestion facilities owned by others, as well as the cost of transport and processing.
Producers may transport their own deadstock on a public highway to locations such as:
During transport, deadstock must be concealed from public view, and the vehicle, trailer or transport container in which it is transported must be designed to prevent leakage. Operators must be able to clean and sanitize the container after transport to reduce the potential for biosecurity problems.
Producers should also be aware of federal rules regarding the transport of cattle as they cannot be moved without a federal Specified Risk Material (SRM) permit.
Plan ahead and consider which disposal options work best for your farm. Incorporate disposal of deadstock into the farm's emergency (or contingency) plan. Additional Factsheets on the requirements of specific disposal methods are available the OMAFRA website at www.ontario.ca/omafra.
Nutrient Management Disclaimer 2018
The information in this factsheet is provided for informational purposes only and should not be relied upon to determine legal obligations. To determine your legal obligations, consult the relevant law, www.e-laws.gov.on.ca. If legal advice is required, consult a lawyer. In the event of a conflict between the information in this factsheet and any applicable law, the law prevails.
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