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Extended colostrum feeding does not have a proven, general return of $500 per heifer. One randomized study found better growth measures when Holstein heifers received 700 g of pasteurized colostrum daily as part of their milk ration for 14 days, but a separate trial of an additional colostrum feeding found no growth benefit. The larger claims about treatment savings and later milk production come from different interventions and evidence types, so they should not be treated as guaranteed results of a two-week feeding program.
For calf managers, the useful question is not whether “extended feeding” works in the abstract, but which protocol was studied, what it changed, and whether that result applies to their herd. Here is what the available studies support—and where the $500 figure stops being evidence.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchWhat does “extended colostrum feeding” mean?
It can refer to several distinct practices: feeding a larger volume during the first hours after birth, offering another colostrum feeding later on day one, including colostrum in milk for a period such as 14 days, or feeding pasteurized colostrum and milk over a longer early-life window. These are not interchangeable treatments. They differ in timing, amount, duration, whether colostrum supplements or replaces milk, and whether pasteurization is part of the program.
That distinction matters because a result from one protocol cannot be assigned automatically to another. A first-hour comparison does not show what happens when colostrum is fed for two weeks. A study of pasteurized colostrum and milk cannot isolate the effect of colostrum duration alone. And a farm case report is not the same as a randomized controlled trial.
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What did the 14-day randomized study find?
The most direct evidence for two-week feeding comes from a randomized Journal of Dairy Science study of 144 neonatal Holstein heifer calves. Starting at two days of age, calves received 0, 350, or 700 g of pasteurized colostrum per day for 14 days. Colostrum was used as a partial replacement for pasteurized whole milk, rather than simply being added on top of the milk ration. After the treatment period, calves returned to the study’s milk-feeding schedule.
The 700 g-per-day group had greater weaning weight, final body weight, heart-girth change, feed efficiency, and average daily gain than the comparison groups. The study reported no refusals. These results support a growth benefit for the specific 700 g-per-day protocol in the studied calves; they do not establish that every extended-feeding program produces the same response or a financial return of a particular size. The published study also says further work is needed to understand the mechanisms behind the findings.
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Outbyte PC Repair FREERepair Windows errors before they cause bigger problemsFix Now →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →The amount and delivery method are important qualifiers. The study tested pasteurized colostrum as part of a milk-feeding schedule, at two specified daily amounts, for a limited period. It did not test every farm’s colostrum quality, sanitation practices, milk program, breed, or management conditions. A result in measured growth outcomes is also not itself a measurement of lifetime profit.
Does giving an extra colostrum feeding improve growth?
Not in every studied protocol. A separate randomized study reported in an American Dairy Science Association conference abstract followed 164 Holstein heifers. All calves received 4 L of colostrum within two hours of birth. The treatment group then received an additional 3 L of colostrum 12–16 hours later, while controls received 3 L of acidified pasteurized whole milk.
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Average daily gain was 0.68 kg in both groups (P = 0.94), and the abstract reported no differences in weaning weight or height. First-week serum Brix differed between groups, but that was not accompanied by a growth difference in the reported outcomes. This trial is a useful counterexample to a blanket claim that more colostrum necessarily means faster pre-weaning growth. Its protocol was an extra feeding on day one—not 14 days of colostrum in milk. The ADSA conference materials identify the study and its reported findings.
Where do the $500, treatment-cost, and milk claims come from?
The $500-per-heifer headline is not substantiated as a general return by the primary studies summarized here. The sources describe separate results with different populations, protocols, follow-up periods, and economic assumptions. In particular, the first-hour volume study and a single-farm case report cannot be combined with the 14-day randomized study to calculate a universal return.
| Evidence | Protocol and population | Reported result | What it can support |
|---|---|---|---|
| Randomized study, 2020 | 144 neonatal Holstein heifers; 0, 350, or 700 g pasteurized colostrum daily as partial milk replacement for 14 days | The 700 g group had greater weaning and final weight, heart-girth change, feed efficiency, and average daily gain | Growth findings for this particular two-week protocol and study setting |
| Randomized study abstract, 2020 | 164 Holstein heifers; an additional 3 L of colostrum 12–16 hours after an initial 4 L, compared with acidified pasteurized whole milk | Average daily gain was 0.68 kg in each group; weaning weight and height did not differ | No demonstrated growth benefit for that additional day-one feeding under the study conditions |
| Faber et al., 2005 | Brown Swiss calves; 2 L versus 4 L of high-quality colostrum within the first hour; 37 and 31 calves, respectively | The 4 L group had higher adjusted milk estimates across the first two lactations and lower reported veterinary costs | Findings associated with first-hour volume in a small cohort—not evidence for 14-day feeding |
| Cohort study, 2020 | Pasteurized colostrum and milk during the first 21 days compared with non-pasteurized colostrum and milk | The pasteurized group had several lower morbidity and higher later production measures | Associations with a broader pasteurization-and-feeding contrast, not a causal estimate for extended colostrum alone |
| Farm case report | Riverview Dairy’s reported 14-day supplementation protocol | The Bullvine reported a fall in scours treatment rate from 23% to 8%, $18.50 lower treatment cost per calf, and 0.24 lb/day higher average daily gain | One farm’s reported experience, not a controlled or universal effect |
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Faber et al. reported $24.51 versus $14.77 in veterinary costs per calf for the 2 L and 4 L first-hour groups, respectively—a difference of $9.74 per calf in that study. The paper also reported 955 kg more 305-day mature-equivalent milk in first lactation and 1,652 kg more in second lactation for the 4 L group relative to the 2 L group. These were adjusted estimates from a small Brown Swiss cohort, not forecasts for present-day herds.
At the historical milk price used in the paper—$0.29/kg, or $13.00/cwt—the authors estimated approximately $160 in gross milk revenue after two lactations. Gross revenue is not net profit: it does not establish a current-dollar return after feed, labor, treatment, equipment, or other costs. The source is a 2005 study of first-hour colostrum volume, not a study of two-week feeding.
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The Bullvine’s account of Riverview Dairy is also specific to that farm. Its reported figures may be useful as a reason to investigate the protocol, but the case report does not establish that other herds will see the same reduction in scours treatment, cost per calf, or gain. The farm case report should not be presented as a controlled trial or as proof that extended feeding adds $500 per heifer.
Do longer-term studies prove that extended feeding boosts lifetime milk?
No. A 2020 cohort study compared calves that received pasteurized colostrum and milk during their first 21 days with calves that received non-pasteurized colostrum and milk. The pasteurized group had lower reported morbidity for bovine respiratory disease in the first year and diarrhea in the first 180 days, higher body weight at calving during the first three lactations, and significantly higher first-lactation milk production. The abstract reported no difference in reproductive performance or cow health outcomes.
Those are potentially important associations, but this was not a randomized comparison of extended colostrum alone. The groups differed in a broader pasteurization-and-feeding contrast, so the results cannot identify extended colostrum as the cause of the later differences. Nor do the reported findings establish a lifetime milk advantage: the summary describes first-lactation production, not an all-lifetime production total. The cohort study is best read with those limits in view.
How should a dairy decide whether to try a protocol?
There is no universally optimal extended-feeding protocol established by these studies. A farm considering a change should define what it is trying to change—growth, health, or another outcome—and compare its proposed practice with the protocol actually studied. Veterinary and calf-nutrition guidance is especially important because colostrum quality, storage, biosecurity, and the surrounding milk program affect whether a published protocol is applicable.
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- Write down the protocol precisely. Specify the calf’s age at each feeding, colostrum amount and quality criteria, number of days, whether colostrum replaces or supplements milk, and whether it is pasteurized. “Feed colostrum longer” is too vague for a meaningful comparison.
- Check fit with the evidence. The clearest two-week growth result involved 700 g of pasteurized colostrum per day as partial replacement for pasteurized whole milk in neonatal Holstein heifers. The separate day-one trial did not show a growth difference. Avoid treating these as evidence for the same practice.
- Review handling and biosecurity with the herd veterinarian. The cited research does not establish that any one collection, storage, or pasteurization process is appropriate for every farm. A feeding change should be considered alongside the herd’s existing procedures rather than as a stand-alone promise of better health.
- Set the outcome and time window before changing practice. Decide whether the goal is a pre-weaning growth measure, diarrhea or respiratory-disease incidence, treatment spending, or later milk production. Record a baseline and compare the same measure over an appropriate period; a change in weight does not prove a change in treatment costs or future milk revenue.
- Calculate economics using local costs. Include colostrum collection and handling, pasteurization where used, labor, the milk displaced if colostrum replaces milk, and any changes in treatment expense. Keep gross milk revenue separate from net margin and do not substitute historical milk prices for current farm economics.
A Brix refractometer appears in the ADSA abstract as a means of assessing colostrum-related measurements. It can be considered a screening aid within a broader quality-control process, not a guarantee of a calf’s later growth or health. The cited material does not establish that using a Brix reading alone produces the outcomes reported in any of these studies.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What should readers conclude about the headline?
The evidence supports a narrower conclusion than “adds $500, slashes treatment costs, boosts lifetime milk.” A randomized two-week study found better growth outcomes for one specific 700 g-per-day pasteurized-colostrum treatment. Another randomized trial found no growth benefit from an additional day-one feeding. The cost and milk figures come from a small first-hour-volume study with historical economics, a separate cohort association, and one farm’s case report—not a replicated estimate of a universal return from extended feeding.
For producers, the practical next step is to evaluate a clearly specified protocol with a veterinarian or calf nutritionist and measure the outcomes that matter on the farm. For readers evaluating the claim, the key question is always: which calves, which colostrum protocol, which comparison, and which measured outcome?
Frequently Asked Questions
Does the research apply to beef calves?
The studies summarized here mainly concern dairy heifers—Holsteins in the feeding trials and Brown Swiss calves in the first-hour volume study. They do not establish the same growth or economic effects in beef calves, so applying the findings there would be an extrapolation.
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Can a farm use the Faber study to forecast current milk income?
Not reliably. Its approximately $160 figure was historical gross revenue calculated at the paper’s stated milk price after two lactations, not a current-dollar estimate or a net-profit calculation. A present-day forecast would require farm-specific prices, costs, and outcomes.
Does a difference in serum Brix mean calves will grow faster?
Not by itself. In the reported additional-feeding trial, first-week serum Brix differed, while average daily gain, weaning weight, and height did not. The abstract therefore does not support using that Brix difference as evidence of improved growth.
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No. It compared broader programs involving pasteurized versus non-pasteurized colostrum and milk during the first 21 days, rather than isolating pasteurization in a randomized test of later milk production. The reported production difference is an association within that comparison.
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