Livestock Data · Calves
The first weeks decide the rest.
Colostrum, treatments and growth in the first weeks shape everything a calf is worth later. Most of it is never written down, and what is written rarely leaves the farm with the calf.
Preweaned dairy heifers that get sick at least once. 5.0% die, at an average age of 24 days.
Source · USDA NAHMS Dairy 2014 · pub. 2021
$252-282
Added cost of a preweaned BRD case by first calving, on top of about $42 to treat (11,470 California calves).
Source · Dubrovsky et al., J Dairy Sci · 2020
01The first meal
Most farms never measure it.
Quality, volume and timing of the first colostrum feeding decide whether a calf gets passive immunity. It is cheap to measure and rarely measured.
- Quality
- Brix % on the colostrum, before it is fed
- Volume
- Litres (quarts) fed at the first feeding
- Timing
- Hours from birth to first feeding
- Result
- Serum Brix or IgG at 1 to 7 days
AND
Producers who use a colostrometer, and a Brix refractometer, to check colostrum.
Source · USDA NAHMS Dairy 2014 · pub. 2021
1 in 8
Dairy calves with poor passive immunity. A habit that takes a minute per calf, against a failure that shows up as sickness weeks later.
Source · USDA NAHMS Dairy 2014 · pub. 2021
02A calf record, field by field
One calf, one record.
Every field carries how it is known. Where nobody took the reading, the record says so: a gap is shown as a gap, never filled with a herd average.
Weights are kept in kilograms and pounds, ADG in kg/d and lb/d, so the record reads the same at a Wisconsin calf ranch and a Dutch veal farm.
Fig. 2.1 · One calf, one record
Example dataCalf · beef-on-dairy heifer
EID 840 000 000 000 001
- EID
- 840 000 000 000 001 Scanned
- Born
- 14 Sep · source dairy D-07 Imported
- Dam · sire
- Holstein 4417 · Angus BX-118 Imported
- Colostrum
- 24% Brix · 4 L (4.2 qt) within 1 h Scanned
- Serum IgG
- Not recorded Gap
- Growth
- 41 → 67 kg (90 → 148 lb) · ADG 0.87 kg/d (1.92 lb/d) Scanned
- Treatment
- Day 11 · drug, dose, route · withdrawal date set Scanned
- Movement
- Dairy → calf raiser, day 4 · signed count Imported
- Official ID
- 840 tag matched to EID Inferred
Illustrative calf. Provenance on every field; the missing serum reading is shown, not estimated.
03Calf health, nationally
A third of heifer calves get sick.
The latest national study of US dairy heifer calves puts morbidity above the industry's gold standard. Mortality sits right at it.
50.9%
Of sick preweaned heifers, the share with scours. 73.8% of sick calves were treated with antibiotics.
Source · USDA NAHMS Dairy 2014 · pub. 2021
Fig. 2.2 · National level against the industry target
Morbidity
33.8%
Target 25% or lower
Mortality
5.0%
Target 5% or lower
Bars scaled to 50%. Brass line: gold standard target (25% or lower morbidity, 5% or lower mortality).
Source · USDA NAHMS Dairy 2014 · pub. 2021
04Beef-on-dairy
Documentation sets the premium.
As every calf gets more valuable, the premium moves from breed to proof. A crossbred calf with its sire, colostrum and treatments on record is worth more to a buyer who can check them.
Extra a beef-on-dairy calf brought over a dairy calf at New Holland, PA, week ending 21 March 2026 (80 to 89 lb).
Source · Southern Ag Today · 31 Mar 2026
$1-4/CWT
Premium reported for age- and source-verified calves. Requires an audited USDA program.
Source · Beef Magazine · UC Davis · 2024
Age and source premiums require an audited USDA program. Mule keeps records that support those programs; it does not verify animals itself.
05Sold at two weeks
The data has to travel with the calf.
30 of 40FARMS
Wisconsin dairies in one survey that sold most beef-on-dairy calves at two weeks or younger.
Source · 40-farm Wisconsin survey · 2025
01 · Day 0 to 4
At the dairy
02 · Handoff
On the truck
03 · Arrival
At the raiser
04 · Weeks later
At the sale
In development · pilots 2027
A morning short list for the riskiest weeks.
With the Mule tag, each calf is compared with her own normal and with her pen-mates. The calves worth a closer look come up first. It points; you and your vet decide.
The Biometric EID Tag- 01Pen 4 · calf 118Check today
- 02Pen 2 · calf 062Watch
- 03Pen 4 · calf 131Watch
- 04Pen 1 · 38 calvesNormal for them
- Example data · illustration
Case 01 · Calf records
Dairies paid on head scanned, not head billed. Losses found at the handoff where they happen, with a reason.Read Case 01
FAQ
Questions
Which calf data matters most?
Birth date, dam, sire and source farm; colostrum quality (Brix), volume and timing; serum IgG at 1 to 7 days; arrival and weaning weights and ADG; every treatment with drug, dose and withdrawal; mortality and cause; movements and official ID. Those are the fields a buyer, a vet and your own closeout will ask for later.
Do I need a refractometer?
It helps. A Brix refractometer reading on colostrum and on serum takes under a minute and turns the most important feeding of a calf's life into a number. Few producers measure it today. If you already use one, Mule records the reading on the calf; if you do not, the field shows as a gap rather than a guess.
We sell calves at a few days old. Is a record worth it?
That is when it matters most. A calf that leaves with its sire, colostrum and treatment history can be sold on documentation rather than on looks, and the buyer can check what they are paying for.
Does the system tell me which calves are sick?
No. It keeps the record and, with the Mule tag in pilot, ranks the calves worth a closer look each morning. Diagnosis and treatment stay with you and your vet.
Can it work with my existing calf or herd software?
Integrations with common herd systems are planned. Today we read exports and documents onto each calf and export back in your layout. Tell us what you use.
Start a project
Tell us how your calves are recorded today.
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juastins@icloud.comReplies within 1 business day. No phone line; every conversation is in writing and in your portal.