The Next Frontier in Dairy · The Cost of the Gap
Two months on her own reserves carries a price far bigger than the vet bills you see.
The fresh-cow energy gap doesn't just cost you litres in the tank. It runs up six separate bills across her lactation — most never itemised on any invoice. Here they are, on one honest basis: per 1,000 cows, per year.
~1,451
MJ NEL — the energy deficit behind every bill
800+ L
milk forgone per cow, at the conservative floor
£272k+
lost milk alone, per 1,000 cows / year
34 ppl
current AHDB farmgate price we cost it at
6
separate, individually costable bills
Where the bill comes from — in one line of biologySee the full biology →
~1,451 MJ
She opens an energy deficit in the first three weeks — demand outruns intake.
0.9 BCS
She covers it by burning her own body — fat and muscle — then rebuilds it at a loss.
survival first
The body funds maintenance and defence before milk or getting back in calf.
6 bills
So the shortfall surfaces later, in six separate places on your P&L.
The itemised bill
The invoice the fresh cow can't send you.
One energy deficit, six separate bills. Lost milk is the one line we measure directly; the other five are costed conservatively from peer-reviewed research — the lowest value in each cited range, so the main figures lean low on purpose. Every line is worth costing in its own right; together they are the NEB Cost Calculator taking shape.
For demonstration of the peer-reviewed research — not a specific claim or guarantee. Each line item uses the lowest value in its cited range (conservative); figures are illustrative, per 1,000 cows/year, and drawn from separate studies. The high end of the same research is shown below.
Bill
What low transition intake does
Evidence
Per 1,000 cows/yr
BILL 01Lost milk
Less intake means less milk — and she never makes back the litres missed in the fresh period. The measured floor of the whole bill.800,000+ L not sold
Hristov et al., 2004 · 10%+ floor (commercial trials)
£272k+directly measured
BILL 02Body condition
She burns ~0.9 of a condition score (~1,451 MJ) of her own fat and muscle to cover the gap, then buys it back in feed at a 35% penalty.~1,451 MJ mobilised/cow; +35% to replace
NASEM, 2021 · Gärtner et al., 2019
~£15k+est. — replacement penalty*
BILL 03Disease
The deficit tips a share of cows into subclinical ketosis, displaced abomasum and metritis — each with treatment, discarded milk and labour of its own.SCK 26% × €18 + metritis 25% × £135
Mostert et al., 2018 · Liang et al., 2017 · Taio & Fiore, 2026
~£37kest. — low end
BILL 04Fertility
Delayed cycling and lower conception push her days-open out. Every extra condition score she holds at service is worth +38.2% conception.~8 extra days open × £0.33/day (herd avg)
French & Nebel, 2003 · Bédère et al., 2018
~£3kest. — low end
BILL 05Emissions
Lower intake and more disease raise the carbon carried by every litre; better health and reproduction cut herd GHG ~3.2% and lift margin ~5%.~3.2% of herd CO₂e × £30/t (notional)
von Soosten et al., 2020 · Aarhus simulation, 2026
~£9kest. — low end
BILL 06Early culling
Cows that don't recover, or don't get back in calf, leave the herd before they ever repay the cost of rearing them.~1% extra involuntary culls × ~£900 net
Herd-structure model (US), 2026 · net-replacement assumption
~£9kest. — low end
Conservative total — low end of every rangeLost milk measured; the other five costed at the lowest cited value. Deliberately conservative.
~£345k+
At the high end of the same peer-reviewed research
Take the upper value in each cited range instead of the lowest — the 16% milk ceiling, the 56% ketosis incidence, the higher per-case and per-day costs — and the exposure for one 1,000-cow herd reaches:
up to ~£865kper 1,000 cows / year (illustrative high end)
The one line we cost today, in the open
800+ L × £0.34/L × 1,000 cows = £272,000+ / year
Assumptions, stated: a conservative 10%+ milk floor from DMI Impact's commercial US trials (6 farms, 10+ years — commercial data, not peer-reviewed) on a ~8,000 L lactation gives ~800 L/cow; costed at the current AHDB/Defra UK farmgate price of 34 ppl (April 2026); per 1,000 cows/year. Intake→yield is supported by Hristov et al. (2004, meta-analysis, US validation).
Basis (conservative, low end of each cited range; per 1,000 cows/year): Lost milk — 10%+ commercial-trial floor (16% at the high end). Body condition — 35% penalty to replace ~1,451 MJ of reserves at ~£0.03/MJ NEL feed. Disease — subclinical ketosis at 26% incidence (Taio & Fiore 2026) × €18/case (Mostert et al. 2018, low of €18–€422) + metritis at 25% (US model 2026) × ~£135/case (Liang et al. 2017, low of $171–$262). Fertility — ~8 extra days open × $0.42/day (French & Nebel 2003, low of their range). Emissions — ~3.2% of herd CO₂e (von Soosten 2020; Aarhus 2026) at a notional £30/t carbon price. Early culling — ~1% extra involuntary culls × ~£900 net replacement. Currencies converted at ~$1=£0.79, €1=£0.85. These are illustrative per-item estimates from separate studies, shown to demonstrate the research — not additive as a validated combined figure, and not a guarantee. Author + year shown; internal library IDs are not.
Why this page is a calculator in waiting
Six bills, one root — and one lever that reaches all of them.
Costed conservatively, the fresh-cow energy gap runs to ~£345k+ per 1,000 cows — and up to ~£865k at the high end of the same research. Most of it is money you are already spending, in six places at once. The reason it matters: if a single lever raises transition-cow intake, it doesn't ease one of these bills. It reaches all six.
There is one lever behind all six bills.
See how the wearable neurostimulation device supports fresh-cow intake.