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AgridianDairy KB

Mortality and carcass management

Definition

Section titled “Definition”

Mortality management is how a dairy handles and disposes of dead cattle (cows, heifers, calves, stillborns, and euthanized animals) so that carcasses do not spread disease, contaminate water or attract scavengers, and so the farm meets state disposal law.

Who sets the rules: states regulate carcass disposal (approved methods, timing, burial setbacks), usually through the state veterinarian, agriculture or environmental agency. Federal rules touch it indirectly: CAFO nutrient management plans must ensure mortalities are not disposed of in liquid manure, storm water or wastewater systems not designed for them (40 CFR 122.42(e)(1)(ii)), and FDA’s BSE feed rule (21 CFR 589.2001) restricts the use of brain and spinal cord from older cattle in animal feed, which affects how renderers handle dead stock.

Main disposal methods:

  • Rendering: a renderer collects the carcass and processes it. Usually the preferred method where service exists.
  • Composting: carcasses covered in a carbon source (sawdust, wood chips, bedding, ground stover) in bins or windrows, to an NRCS 316-type design.
  • Burial: allowed in most states with conditions on depth, soil, distance to water and wells, and depth to groundwater; often banned or restricted for large numbers or in high water-table areas.
  • Incineration and landfill (where the landfill accepts animal carcasses).
  • Necropsy at a diagnostic lab before disposal when the cause of death matters (outbreaks, unusual deaths, reportable disease suspicion).

Handling a suspected reportable or foreign animal disease (e.g. sudden deaths with neurological signs) is different: stop, do not move the carcass, and call the herd veterinarian and state veterinarian.

How to pull it in DC305

Section titled “How to pull it in DC305”

DC305 records deaths as a DIED event, usually with a remark or code for the cause, and euthanasia may be coded separately. List deaths over a period with:

EVENTS\D DIED ID LACT DIM FOR EDAY>-30       deaths in the last 30 days (dead animals only)
LIST\D ID LACT PEN DIEDT FOR DIEDT>-30     the same animals with died date (DIEDT), for the disposal log
ECON\E                                      dead cow summary report

Cause-of-death codes, whether euthanasia is a separate event or remark, and whether stillborn and dead-on-arrival calves are registered at all vary by herd: check the herd’s private dc305-vocab mapping. See adult cow mortality for the rate calculation and DC305 events for including animals that have left the herd. EVENTS lists live animals only by default: dead animals need \D (dead only) or \B (live and dead), and animals moved to the archive file need \L.

Not in DC305: renderer pickup tickets, compost temperature logs, burial location records, and the written mortality-handling section of the NMP or biosecurity plan.

Typical range

Section titled “Typical range”

Herd context: US Holsteins, freestall or dry-lot; state disposal rules as of 2026 (they vary widely).

  • Timing: many states require disposal (or pickup arrangements) within 24–72 hours of death.
  • Burial: common state requirements include at least 2–3 ft of soil cover, a minimum separation above the seasonal high water table, and setbacks of roughly 100–300 ft or more from wells, surface water and property lines.
  • Composting: a base layer of about 24 in of carbon material under the carcass and a similar cover; pile temperatures of about 130–150°F (55–65°C); mature cows take roughly 6 months or more to break down, plus curing.
  • Volume: adult cow mortality in US herds commonly runs about 5–8% per year, plus calf deaths; plan pickup or compost capacity for peak months (heat stress, calving surges).

Requirements change; confirm the current version with the program or regulator. This page is not legal or veterinary advice.

Common mistakes

Section titled “Common mistakes”
  • Carcasses left in alleys or pens for a day or more.
  • Renderer truck driving through the farm: put the pickup point at the perimeter, away from cattle and feed lanes. See the biosecurity plan.
  • Moving carcasses with the feed loader without cleaning it.
  • Burial in a high water-table area or near a well.
  • Compost piles without enough carbon or cover, causing odor, leachate and scavengers.
  • No cause of death recorded, so mortality trends can’t be analyzed.
  • No plan for mass mortality (heat wave, disease outbreak, barn fire). See emergency preparedness.
  • Not getting a necropsy when several animals die suddenly.
Section titled “Related”