The Real Cost of Livestock Mortality and How to Reduce It

The real cost of a dead animal is its value when you got it, plus everything you spent on it until it died (feed, health care, labour), plus the profit it would have earned. That total is then carried by the surviving animals, raising their cost per head. To control it, record every death with its date, age, group and likely cause, and calculate the mortality rate per group.

Most breeders feel a loss when it happens, but few put a number on it. Deaths are spread over the year, often in young animals that "were not worth much yet", so the total stays invisible. Yet in many flocks, losses are one of the biggest hidden costs, and also one of the most controllable.

What a dead animal really costs

Think of every loss in three layers:

1. Value invested. Purchase price, or for home-bred animals the estimated value at birth or weaning (the dam's feed and care during pregnancy were not free).
2. Costs spent until death. Feed eaten, vaccines and treatments, a share of labour, water and other running costs. An animal that dies at the end of fattening is far more expensive than one lost in its first week.
3. Lost future income. The profit the animal would have made at sale, or for a breeding female, the offspring she will no longer produce.

There are also costs that do not appear on any invoice: vet visits and treatments for the rest of the group, extra labour, disposal, and the stress on animals and people during an outbreak.

How to calculate it: an illustrative example

A fattening group of 100 lambs, with 4 deaths during the cycle. All figures are illustrative units, not market prices.

The direct loss of 3,880 is spread over the 96 survivors: about 40 extra per head. If the expected profit per head was 200, the four deaths have quietly removed about a fifth of the margin on every surviving lamb, before even counting the lost profit of the dead ones.

This is why mortality must be part of your cost per head. Leave it out and your profit looks better than it is.

The mortality rate formula

Mortality rate for a period = number of deaths ÷ average number of animals in the group during the period × 100.

Calculate it per group, not only for the whole herd: newborn lambs and kids, weaned young stock, fattening animals, adult females and breeding males. A herd-wide figure can look acceptable while one group has a serious problem.

Where losses usually happen

The risk is not spread evenly. Typical high-risk periods:

• Birth to the first weeks: weak or chilled newborns, lack of colostrum, mismothering, difficult births, navel infections and diarrhoea. This is usually the riskiest period of an animal's life.
• Around weaning: stress, diet change, parasites and respiratory problems. See our guide to pneumonia in lambs and kids.
• Fattening: digestive problems linked to sudden high-grain feeding, and diseases such as enterotoxemia where vaccination and gradual feed changes matter.
• Late pregnancy and lambing for ewes and does: metabolic disease, difficult births, mastitis.
• Heat waves, cold snaps and droughts: in hot climates, shade and water shortages raise losses across all groups.
• New arrivals: animals bought without quarantine can bring disease into the whole herd.

How to reduce mortality where it pays most

You do not need to fix everything at once. Start where your records show the most deaths:

1. Prepare for births. Clean, dry kidding and lambing pens, someone checking regularly, and newborns sucking colostrum early.
2. Vaccinate on schedule. Vaccination programmes must follow your local vet and the official ministry schedule; keep the dates recorded so nothing is missed.
3. Quarantine every new animal before it joins the herd.
4. Change feed gradually, especially when moving to grain-rich fattening rations.
5. Control parasites with a plan from your vet rather than random treatments.
6. Provide shade, ventilation and clean water, above all in summer.
7. Act early on sick animals. Isolate them and call the vet; ask for a post-mortem when several animals die of an unknown cause, so you treat the real problem.

Each of these has a cost, but compare it with the loss table above: preventing even one or two deaths in a group often pays for the effort.

Turning losses into data

You can only reduce what you measure. For every death, record:

• Animal number and colour tag, age, sex and group.
• Date, and the stage it was in (newborn, weaning, fattening, pregnant).
• Signs seen before death and the cause found by the vet, if known.
• Treatments given before it died.

In Throf, each animal keeps its full history — illnesses, treatments, vaccinations and isolation periods — so when one dies you can look back at what happened before. Because expenses and feed are tracked, the cost already spent on it is not lost from your accounts, and your cost per head and net profit reflect reality. Reviewing deaths by group each month quickly shows whether the problem is at birth, at weaning, or in one particular pen.