A day earlier is worth something.It is not worth what people assume.

Every product in this category eventually makes an economic claim, and most of them make it in the same place: a disease outbreak, a large number of dead birds, and an implied saving. We think that framing is the weakest available, not the strongest. The catastrophic case has the cleanest arithmetic and the narrowest window. The value that is larger in aggregate sits in the ordinary middle of a growout, where nothing dramatic happens and the flock simply underperforms. This note works through both with the published numbers, and labels how old each one is.

The one place where a day is unambiguously money

USDA APHIS states the rule in a sentence. It pays for birds and eggs that must be destroyed, and it does not pay for birds that died from highly pathogenic avian influenza. Its own guidance draws the conclusion for the producer: because indemnity covers only live birds, and because the disease spreads quickly and can be fatal to flocks, it is critical to report sick birds immediately.

Set that against the speed of the thing. The current strain is described in a Congressional Research Service report as having a mortality rate in birds of nearly 100 percent, and as of 23 April 2025 the outbreak that began in February 2022 had reached 1,689 confirmed flocks and 168.62 million birds across all fifty states. Broilers are about 8 percent of infected birds in that count; table-egg layers are 75 percent. Peer-reviewed field data from Thailand in 2005 recorded cumulative mortality reaching 100 percent within six days of clinical signs. In that regime every day of delay converts indemnifiable live birds into uncompensated dead ones. It is the cleanest, most checkable economic statement in this whole area.

It is also, for a broiler grower, a rare event with a hard ceiling on how much detection can help. Which brings us to the number that should temper the whole argument.

Two days

A modelling study by Bos and colleagues, reproduced in a peer-reviewed review in Avian Pathology, worked through a 10,000-bird flock. Under a reporting threshold of 0.5 percent daily mortality on two consecutive days, virus was probably introduced 12 days before detection, with a range of 11 to 15, and a noticeable rise did not occur until day 10. Lowering that threshold to 0.01 percent on two consecutive days reduced the interval to 10 days, range 7 to 12.

A fiftyfold reduction in the alarm threshold bought two days. It would also, on the evidence in our other notes, buy a great many more false alarms. Anyone quoting a transformational lead time from threshold-lowering alone is quoting something this model does not support, and it is worth remembering the model is a model.

Where the money actually is

Blake and colleagues, in Veterinary Research in 2020, did the most useful thing anyone has done with a disease cost estimate: they decomposed it. Their UK coccidiosis figure for 2016 was 99.2 million pounds, with a published range of 73.0 to 125.5 million, up 2.6-fold from 38.59 million in 1995. The components are the point.

Reduced weight gain accounted for 58.80 million pounds. Worsened feed conversion accounted for 23.60 million. Prophylaxis accounted for 10.44 million. Mortality accounted for 0.90 million. Morbidity was more than 80 percent of the total cost in India, the United Kingdom and the United States. A monitoring product justified purely on birds that would otherwise have died is arguing about roughly one percent of the coccidiosis loss pool in that country.

Mortality was 0.9 percent of the UK cost of coccidiosis. Weight gain and feed conversion were 83 percent of it.

Two caveats belong with those numbers. They rest on structured elicitation of industry experts rather than measured farm accounts, and the authors publish wide ranges that should be reproduced rather than dropped. And coccidiosis is one disease. But the structural finding, that morbidity dominates mortality in the cost of endemic disease, is the single most useful economic fact we have found for this product category.

The trend nobody has decomposed

The National Chicken Council series on US broiler performance shows two lines moving in opposite directions over a decade. Mortality went from 4.8 percent in 2015 to 5.95 percent in 2025. Feed conversion improved over the same period from 1.89 to 1.70, with market age at 47.5 days and market weight at 6.63 pounds in 2025.

The industry got substantially better at converting feed and worse at keeping birds alive. Longer big-bird programs, flock mix and disease pressure all sit inside that number undecomposed, and this is an industry-body statistic rather than a peer-reviewed analysis. We report it because it makes two practical points at once. Any detection system calibrated on a decade-old mortality expectation is calibrated wrong. And whatever is driving the rise has not shown up in the conversion figure, which is exactly the pattern you would expect if the losses are concentrated in events rather than spread through the growout.

Grower economics, in 2011 dollars

The best-documented cost breakdown for US contract growers is USDA ERS report EIB-126, built on the 2011 ARMS survey. Every figure in it is in 2011 dollars and should be read that way, never as current cost. It puts feed at 29 cents per live-weight pound, chicks at 5 cents and veterinary services at 0.4 cents, against a value of production of 44.8 cents. Mean grower payment was 5.6 cents per pound. The average operation ran 4.3 houses and removed 504,180 birds a year, out of 66,680 broiler houses nationally, with survey mortality at 3.74 percent.

The shape of that is more durable than the levels. Feed is the overwhelming input cost and the grower payment is a thin margin over a large throughput. A change in feed conversion moves more money than a change in mortality does, at anything short of a catastrophic loss, which is the same conclusion the coccidiosis decomposition reached from a different direction.

Condemnation is a smaller lever than intuition suggests, at least for broilers. USDA NASS recorded ante-mortem condemnation of young chickens at 0.19 percent of live weight in 2024 and post-mortem at 0.46 percent. Mature chickens run an order of magnitude worse, at 1.15 and 3.47 percent, but that is a different segment of the industry.

One structural detail belongs alongside the indemnity rule, because contract growers are not paid the same way owners are. Under the federal regulation, contractor indemnity is calculated as the contract value divided by the contract duration in days, multiplied by the days from the start of services to destruction, reduced by payments already received, with the owner receiving the difference. An approved biosecurity plan, audited at least once every two years, is a condition of eligibility. Knowing which side of that formula you sit on changes what an extra day is worth to you specifically.

Where the payoff sits

Earlier detection is worth the most in two places, and neither is the one usually advertised. In the catastrophic case it is worth the difference between indemnifiable and uncompensated birds, which is real and rare and largely governed by rules rather than by models. In the ordinary case it is worth the weight gain and the feed conversion that a sub-clinical challenge quietly takes out of a flock over two weeks while mortality never moves enough to notice. The first case makes the better headline. The second is where the money is, and it is the harder detection problem, which is presumably why it is less often claimed.