Testing colostrum takes 30 seconds. Saves $20/calf immediately. Adds $350 lifetime. Why isn’t everyone doing this?
EXECUTIVE SUMMARY: For 20 years, we’ve been overfeeding colostrum without realizing it—and it’s been hurting both calves and profits. Modern dairy genetics have quietly doubled colostrum antibody concentration from 50 to 90 grams per liter, but we’re still feeding volumes designed for our grandparents’ cows. Cornell’s groundbreaking 2024 study shows that feeding just 2.5 liters of today’s high-quality colostrum works better than 4 liters, improving absorption efficiency by 24% while eliminating painful colic symptoms in calves. The economics are compelling: precision feeding saves $20 per calf immediately and adds $300-350 through increased first-lactation milk production. Implementation couldn’t be simpler—a $200 refractometer and 30-second test tells you exactly what each cow produces, letting you bank excess premium colostrum while optimizing calf health. Smart producers are already making the switch, treating colostrum like the liquid gold it’s become. The science is clear: less really is more when you’re feeding modern colostrum.
You know how sometimes a piece of information hits you and suddenly everything makes sense? That’s exactly what happened to me at a University of Wisconsin extension meeting this fall. Dr. Donald Sockett—who’s been around calves longer than most of us have been farming—showed us data from the latest Cornell research that basically turned my understanding of colostrum feeding upside down.
What caught me off guard was this: we’re still feeding colostrum like it’s 2004, but our cows? They’re producing something completely different now. And some of the calves we thought were thriving… well, turns out they might actually be uncomfortable from what we’ve been doing to them.
The Quality Jump That Snuck Up on Us
So I’ll admit it—I feel a bit foolish for not noticing this sooner. While we’ve all been focused on pushing production records, tracking genomic gains, watching butterfat levels climb… our cows have been quietly revolutionizing their colostrum quality right under our noses.
The numbers tell quite a story. Back when I started farming (and don’t ask me exactly when that was), average colostrum measured around 50 grams per liter of IgG. That’s what all the feeding guidelines were based on.
Today? Well, the data compiled by Wisconsin’s veterinary team, along with studies from Bielmann’s group and more recent work by Conneely, shows we’re routinely seeing 75 to 95 grams per liter.
Let that sink in for a minute. That’s nearly double the antibody concentration. Double.
Dr. Miriam Weber Nielsen from Michigan State put it perfectly when she told me that these modern cows aren’t just making more milk—they’re making fundamentally different colostrum. The whole biological system has upgraded.
What drove this change? A bunch of things came together, really.
You probably remember when genomic selection took off around 2009. The Council on Dairy Cattle Breeding’s data shows it basically doubled our rate of genetic gain. And what’s fascinating is that health traits improved right alongside production. Better udder health naturally means better antibody production. Makes sense when you think about it.
Then there’s dry period management. Remember when everyone was trying shortened dry periods or even continuous milking? Yeah, that didn’t work out so well. Canadian research confirmed what many of us learned the hard way—those traditional 50 to 60-day dry periods really do optimize antibody transfer. Most of us have gone back to standard dry periods, and wouldn’t you know it, colostrum quality improved.
Sandra Godden’s work has shown us something else, too—when you really dial in that dry cow nutrition, especially energy and protein balance, colostrum IgG concentration responds beautifully. Today’s TMR formulations have basically optimized this in ways we couldn’t achieve before.
And timing… oh boy, timing matters more than I realized. Research has documented that IgG concentration in colostrum can drop by about a third in the 14 hours after calving. Most of us now harvest within 2 to 6 hours. When I started, 12 to 24 hours was pretty normal. That change alone makes a huge difference.
When Cornell Proved We’ve Been Overdoing It
Alright, so the Cornell study—this is where things get really eye-opening. S.E. Frederick and Dr. Sabine Mann’s team fed 88 Holstein heifer calves colostrum at 6%, 8%, 10%, or 12% of their birth body weight. Really controlled conditions. And what they found in a recent Journal of Dairy Science paper (2024)? It challenges pretty much everything I was taught.
The calves getting 12% of body weight absorbed IgG at only 36.3% efficiency. The ones getting 6%? They hit 47.8% efficiency. So we’re literally getting less bang for our buck by feeding more.
But what really made me pay attention—and this is clever—they used acetaminophen as a marker to track how fast things moved through the gut. Eight hours after feeding, those high-volume calves still had 65.5% of that marker sitting in their abomasum. The lower-volume group? Only 50.4%.
That colostrum wasn’t even getting to the small intestine, where it needs to be absorbed.
And—this is the part that bothers me—those high-volume calves were clearly uncomfortable. The ones getting 10% and 12% of body weight showed abdominal kicking. Classic colic behavior. The 12% group kicked 40 times during observation. You know how many times the 6-8% groups kicked? Zero. Not once.
Dr. Ryan Breuer from Wisconsin explained it in a way that finally made it click for me: those intestinal cells that absorb IgG through pinocytosis? They’ve got limits. Feed more than they can handle, and you basically create a traffic jam in the gut. The IgG can’t get absorbed, the calf feels lousy, and you’ve wasted good colostrum.
Quality Wins Every Time
While Cornell was documenting the problems with overfeeding, the University of Montreal team was out there proving what actually works. Their 2021 study in the Canadian Journal of Animal Science followed 818 calves across 61 Quebec Holstein farms. Real farms, real conditions—not some pristine research facility.
What they found was crystal clear: calves getting colostrum that tested at 24.5% Brix or higher were nearly three times more likely to achieve adequate passive transfer compared to calves getting lower-quality colostrum. Three times!
To put that in perspective, quality mattered more than anything else they looked at. Feeding more volume? That only gave you 2.6 times better odds. Earlier timing? 1.6 times. Bottle versus tube feeding? Just 1.4 times. Quality beat everything.
And this really made me think—those Quebec farms fed a median volume of just 2.8 liters at first feeding. That’s way less than the 4 liters we’ve been told to feed. Yet 68% of those calves achieved adequate passive transfer. Why? Because their median colostrum quality was 23.5% Brix, well above what we used to consider good enough.
A Producer’s Guide: Precision Colostrum Feeding
Stop feeding by tradition. Start feeding by science.
| Calf Birth Wt | High Quality (≥25% Brix) | Medium Quality (22-24% Brix) | Traditional (outdated) |
| 40 kg (88 lb) | ✓ 2.5 L (6.3% body wt) | △ 3.4 L (8.5% body wt) | ✗ 4.0 L (10.0% body wt) |
| 35 kg (77 lb) | ✓ 2.2 L (6.3% body wt) | △ 3.0 L (8.6% body wt) | ✗ 4.0 L (11.4% body wt) |
| 30 kg (66 lb) | ✓ 1.9 L (6.3% body wt) | △ 2.6 L (8.7% body wt) | ✗ 4.0 L (13.3% body wt) |
Banking Tips:
- Freeze in 1-liter bags for easy thawing
- Label with date and Brix score
- Use within 6 months for best quality
Making This Work on Real Farms
So you’re probably thinking what I thought: “Okay, interesting research, but how do I actually do this?” Fair question. Let me share what I’ve learned from folks who’ve successfully made the switch.
First thing—you’ve got to know what you’re working with. Get yourself a Brix refractometer. They run about $200 from most dairy suppliers. The digital ones are nice if you want to splurge, but honestly, the optical ones work just fine. Takes maybe 30 seconds to test once you get the hang of it.
And that brings me to banking, which I think is one of the most underutilized tools we have. When you test a cow at 28% Brix and only need to feed 2.5 liters to her calf, you might have 2 to 3 liters of premium colostrum left over. Freeze it! That’s your insurance for when a heifer freshens with poor colostrum or you get surprise twins.
Now, I’ll be honest—not everyone sees immediate benefits. A neighbor of mine with 60 cows tried this for three months and said the extra testing time didn’t pencil out for him. Fair enough. But most operations I’ve talked with find the time investment pays off pretty quickly, especially once employees get into the routine.
This past spring calving season really drove it home for me. We had two heifers freshen the same night with colostrum testing at 18% Brix—way below what we needed. But because we’d been banking all winter, we had plenty of high-quality colostrum ready to go. Those calves got what they needed, and both are thriving now.
The Economics Make Sense
Let’s talk money, because that’s what it comes down to for most of us. Current colostrum replacer runs $35 to $45 per bag—and that makes about 3 liters. So every liter of high-quality colostrum you bank is worth $12 to $15. Start banking 1.5 liters from 40% of your fresh cows, and it adds up fast.
Then there’s growth. Calves with optimal colostrum gain an extra 0.24 pounds per day preweaning. Doesn’t sound like much? Over 60 days, that’s 14 pounds. At a typical feed conversion, that’s another $20 per calf.
And this is what really gets me—those same calves produce 626 kilograms more milk in their first lactation. At current prices of around $21 to $24 per hundredweight, we’re talking $300 to $350 in additional revenue per animal. From decisions you made in the first 12 hours of life.
Though I should mention, labor is a consideration. Training employees takes time, and if you’re dealing with high turnover, that’s a real cost. Some operations find that factor alone makes traditional protocols more practical for them.
Extended Feeding: The Next Frontier
What’s got me really interested lately is what happens when you keep feeding colostrum or transition milk beyond that first day. Most of us switch calves straight to milk replacer or whole milk, but there’s growing evidence that this is leaving gains on the table.
Michigan State published fascinating work in 2020. Calves fed transition milk for just three days after colostrum weighed 6.6 pounds more at weaning. The extra energy in transition milk accounted for only about 1.5 pounds of that. The rest? Enhanced gut development.
An Iranian-German team took it further, supplementing calves with 700 grams of colostrum daily for two full weeks. They saw significantly fewer days with diarrhea, less respiratory disease, and better feed efficiency throughout the preweaning period. Published in the Journal of Dairy Science in 2020, and it’s got a lot of us rethinking our protocols.
For operations with automated calf feeders, this gets interesting. You can program different feeding curves based on colostrum quality scores. Some larger dairies are already doing this, though the complexity of the setup means it’s not for everyone.
Different Regions, Different Challenges
Looking at how this plays out across the country, implementation varies quite a bit depending on where you farm. Many Upper Midwest producers I’ve talked with notice higher colostrum quality during fall and winter—probably because there’s less heat stress during the dry period. Southern producers often report the opposite pattern, especially during those brutal August dry periods.
Out in California’s Central Valley, those large-scale operations have had to get creative with banking systems. Smaller bags for faster thawing, dedicated freezers in climate-controlled rooms. Makes sense when you’re dealing with their volumes and temperatures.
The grazing operations in the Northeast face their own challenges. Pasture-based dry cow management can produce exceptional colostrum quality, but volume tends to be more variable. These folks really benefit from having robust banking systems to buffer that natural variation.
And smaller operations—those milking under 100 cows—might actually have some advantages here. You know your cows better, can track individual quality easier, and have more flexibility in your protocols. When you’re only calving a few cows a week, building and managing a colostrum bank is pretty straightforward.
That said, some small producers tell me the return on investment just isn’t there for them. When you’re already achieving decent passive transfer rates and labor is tight, sticking with what works makes sense.
Common Mistakes to Avoid
I’ve watched quite a few farms try to make this transition, and there are definitely some pitfalls to watch out for.
The biggest mistake? Testing colostrum but not actually changing anything. I know it sounds ridiculous, but I’ve seen it happen multiple times. Farms buy the refractometer, test every batch, write down the numbers… and then keep feeding 4 liters because that’s what feels safe. The data just piles up on clipboards without driving any decisions.
Consistency is crucial, too. If your weekend crew is still doing things the old way, you won’t see the benefits. Make it visual—post a laminated chart showing exactly how much to feed based on Brix reading and calf size. Take the guesswork out of it.
And don’t forget about those smaller calves. Jersey calves, twins, that occasional small Holstein heifer—they need proportionally less. A 30-kilogram calf getting 4 liters is receiving 13% of its body weight. No wonder some of these calves look uncomfortable after feeding.
The Organic Angle
This precision approach is especially valuable for organic producers. With a limited treatment toolbox, the prevention provided by excellent passive transfer is critical, and many organic farms report substantial reductions in calf health issues after making the switch.
Where This Is All Heading
Looking ahead, I think precision colostrum management will likely follow the same path as genomic testing. Five years ago, plenty of folks were skeptical. Today? It’s just how we do things on progressive farms.
The Council on Dairy Cattle Breeding recently announced genomic evaluations for calf wellness. The heritability for calf serum total protein (a measure of passive transfer) is around 0.17—that’s workable for genetic selection. Some farms are already starting to select for colostrum quality.
And extended feeding protocols? I think that’s the next big shift. Once producers see the growth and health benefits from feeding transition milk for 3 to 7 days, it’ll likely become more common. We’re just scratching the surface there.
What’s interesting is how this connects to everything else we’re doing. Better genetics leading to better colostrum. Better colostrum management leading to healthier calves. Healthier calves are becoming more productive cows. It’s all connected, and we’re finally starting to see the whole picture.
The Bottom Line
Look, I get that change is hard. Especially when what you’ve been doing seems to work okay. But the thing is—the colostrum our cows produce today is fundamentally different from what it was 20 years ago. We’ve improved the genetics, nutrition, and management… but not the feeding protocols.
The research from Cornell, Montreal, and Michigan State—it’s all pointing in the same direction. Quality matters more than quantity. Precision beats volume. And what worked for 50 g/L colostrum just doesn’t make sense for 90 g/L colostrum.
You don’t have to change everything overnight. Start by testing your colostrum for a week. See what you’re actually dealing with—I’ll bet you’ll be surprised. Then gradually adjust volumes based on quality. Bank the excess. Track your results.
The tools are simple—a $200 refractometer and a scale for calves. The protocol is straightforward. And the payoff? Healthier calves, better growth, improved lifetime production, and a freezer full of insurance for when you really need it.
This isn’t about being revolutionary. It’s about good management catching up with good genetics. The cows changed. The colostrum changed. Maybe it’s time our feeding protocols caught up too.
And honestly? Once you see those calves thriving on less volume of better-quality colostrum, with none of that post-feeding discomfort we used to think was normal… you’ll wonder why we didn’t figure this out sooner.
KEY TAKEAWAYS
- Modern colostrum is 2X stronger—Test quality with a Brix refractometer ($200, takes 30 seconds) to avoid overfeeding calves with volumes designed for 1990s genetics
- Feed by quality, not tradition—High-quality colostrum (≥25% Brix): 2.5L | Medium (22-24% Brix): 3.3L | Low (<22% Brix): Don’t use for first feeding
- Bank the surplus—When premium colostrum only needs 2.5L instead of 4L, freeze the excess as insurance for when heifers deliver poor-quality batches
- The math is compelling—Precision feeding returns $20/calf immediately in health savings, plus $300-350 through 626kg more milk in first lactation
- Implementation is simple—Most farms see ROI within 60 days using just a refractometer and a laminated feeding chart in the calf barn
Complete references and supporting documentation are available upon request by contacting the editorial team at editor@thebullvine.com.
Learn More:
- Revolutionizing Calf Rearing: 5 Game-Changing Nutrition Strategies That Deliver $4.20 ROI for Every Dollar Invested – This guide details the practical next steps after colostrum, revealing how to leverage pair housing, extended transition milk feeding, and new weaning protocols to build on your calf’s strong start and maximize health.
- Dairy Profit Squeeze 2025: Why Your Margins Are About to Collapse (And What to Do About It) – This economic analysis provides the critical “why” for optimizing calf health. It shows how saving $20 per calf is essential for survival when margins are tightening and provides strategic advice on culling and cost control.
- Genetic Revolution: How Record-Breaking Milk Components Are Reshaping Dairy’s Future – This piece explains the genetic shift that caused the colostrum revolution. It explores how breeding for high components created better colostrum and why this trend, combined with new genomic indexes, is redefining dairy profitability.
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