Colostrum management

Definition

Colostrum management is the set of practices that decide how much clean, high-IgG colostrum a newborn calf absorbs. Its result is measured as passive transfer. It is commonly summarized as the 5 Q’s:

Quality: IgG concentration of the colostrum fed.
Quantity: volume fed at the first feeding (and over the first day).
Quickness: time from birth to first feeding.
(S)queaky clean: bacterial load of the colostrum.
Quantified: routinely measuring colostrum and calves so problems are found.

IgG mass fed (g) = IgG concentration (g/L) × volume fed (L). Passive transfer depends on how much IgG is fed, how soon it arrives, and how many bacteria compete with it in the gut.

Quality

Target ≥ 50 g/L IgG. On farm this is estimated with a Brix refractometer: ≥ 22% Brix on colostrum approximates ≥ 50 g/L IgG (Bielmann et al. 2010). Quigley et al. 2013 found 21% classified their samples best, and Godden et al. 2019 note that studies report cut points between 18% and 23% Brix.
Some programs use higher cutoffs (e.g. 23–25% Brix) to allow for measurement error, or tier colostrum (first feeding vs second feeding).
Quality varies widely between cows. First-milking colostrum collected soon after calving is best; delays in collection lower IgG.

Quantity

First feeding: 10–12% of birth weight, i.e. 3–4 L (about 3–4 qt) for a Holstein calf (Godden et al. 2019).
Many herds give a second feeding of about 2 L around 12 hours. In a study cited by Godden et al. 2019, calves fed 4 L at birth plus 2 L at 12 hours had higher 24-hour serum IgG (31.1 g/L) than calves fed 2 L plus 2 L (23.5 g/L).
Bottle-fed calves often drink less than offered (one study averaged 2.2 L). Tube the remainder or offer a second bottle within about 6 hours.
Esophageal feeders deliver a full volume to calves that won’t drink from a bottle. Used carelessly they can put colostrum in the lungs.

Quickness

First feeding within 1–2 hours of birth. Absorption falls through the first day, and gut closure is essentially complete by about 24 hours.

Cleanliness

Total plate count (TPC) < 100,000 cfu/mL and total coliform count < 10,000 cfu/mL for fresh colostrum fed to calves (Godden et al. 2019). Goals for heat-treated colostrum are tighter: TPC < 20,000 cfu/mL and coliforms < 100 cfu/mL.
Bacteria bind free IgG and block its uptake, and they cause scours and septicemia directly.
Main sources: dirty teats, buckets, tubes and feeders, and colostrum left warm.

Pooling

Pooling colostrum from several cows is discouraged:

one low-IgG cow dilutes the pool;
pools spread Johne’s disease (Mycobacterium avium subsp. paratuberculosis), Mycoplasma, Salmonella, bovine leukemia virus and other pathogens;
pools usually sit warm longer and grow more bacteria.

If pooling is unavoidable, pool only tested high-quality colostrum from test-negative cows, heat-treat it, and cool it quickly.

Storage and handling

Per Godden et al. 2019:

Refrigerate or freeze within 1 hour of collection unless it is fed right away.
Raw refrigerated colostrum reached unacceptable bacteria counts (TPC > 100,000 cfu/mL) after about 2 days in one study. With potassium sorbate (0.5% final solution) it stayed below 100,000 cfu/mL for 6 days.
Freeze for longer storage (up to 1 year), avoiding repeated freeze-thaw cycles. When thawing, keep colostrum below 140 °F (60 °C) to avoid denaturing IgG; don’t microwave it on high.
Heat treatment at 140 °F (60 °C) for 60 minutes cuts bacteria while keeping IgG, and improves IgG absorption. Refrigerated in a clean covered container, heat-treated colostrum keeps at least 8 days.

Colostrum replacers and supplements

Replacers are designed to replace maternal colostrum completely. Godden et al. 2019 recommend a minimum of 100 g IgG per pack, plus enough nutrients for the first day. For context, about 150–200 g IgG is needed for adequate passive transfer (serum IgG > 10 g/L) in ≥ 90% of calves, and ≥ 300 g for the “excellent” category.
Supplements typically contain ≤ 60 g IgG per dose. They top up colostrum; they don’t replace it.
In the US, licensed products are regulated by the USDA Center for Veterinary Biologics; unlicensed products cannot legally claim to supply IgG.

How to pull it in DC305

DC305 has no standard colostrum items. Herds that record colostrum use:

a user-defined item on the dam for colostrum Brix or quality grade;
a user-defined item or event on the calf for colostrum volume, time of feeding, or replacer use;
more often, a calf app or paper log outside DC305.

LIST ID BDAT CBRIX FOR LACT=0 BDAT>-30
SUM CBRIX FOR LACT>0 FDAT>-30

CBRIX above is an example name only. Item and event names differ by herd; check the herd’s private dc305-vocab mapping.

The most reliable outcome measure in DC305 is the passive-transfer test result on the calf. See passive transfer.

Typical range

Herd context: US Holstein dams and heifer calves, freestall or dry-lot dairies.

Measure	Target
Colostrum IgG	≥ 50 g/L (≥ 22% Brix)
Share of colostrum samples ≥ 50 g/L IgG (≥ 22% Brix)	≥ 90%
First-feeding volume	10–12% BW (3–4 L for a Holstein)
Time to first feeding	≤ 1–2 h
Total plate count	< 100,000 cfu/mL
Total coliform count	< 10,000 cfu/mL
Calves in the “Excellent” passive-transfer category	> 40%

Targets are from Godden et al. 2019; the “Excellent” share is the Lombard et al. 2020 herd goal. In the NAHMS Dairy 2014 study of 2,253 colostrum samples from 104 farms, 77.4% exceeded 50 g/L IgG (mean 74.2 g/L), and almost 43% of 827 samples had TPC above 100,000 cfu/mL (both as reported by Godden et al. 2019).

Common mistakes

Using the serum Brix scale on colostrum or the reverse. Colostrum is graded around 22%; serum around 8–9%.
Not testing colostrum, so poor colostrum is fed at the same volume as good colostrum.
Pooling colostrum from many cows.
Leaving colostrum warm in the parlor or a bucket before cooling it. Bacteria multiply fast.
Thawing frozen colostrum too hot or in a microwave.
Late first feeding on night shifts and weekends. Track time to feeding by shift.
Dirty feeding equipment. Culture colostrum from the feeder, not only from the collection bucket.
Judging the program on colostrum alone. Monitor calf serum results too; the program only works if calves absorb the IgG.