What Are Your Cows Telling You About Feed, Heat and Health?

Good cow monitoring starts on your daily rounds: look at the feed, watch the cows and make sure anything unusual gets followed up. Those small checks help you find where feed, time or breeding opportunities might be slipping away.

You've finished milking, the mixer has been through and the next job is already waiting. Before you move on, take another look down the feed bunk. Is the feed where the cows can reach it? Is one cow hanging back? Did anyone tell the next shift about the cow showing signs of heat?

You probably ask these questions every day. The tricky part is keeping track of the answers when you're short of time and several people share the work.

Let's walk through feeding, breeding and signs that a cow needs attention, then work out whether a change leaves more money in the business.

A few things to keep in mind

• The ration on paper and the feed your cows actually eat are not always the same.
• More milk is worth more only when it pays for the extra costs behind it.
• A heat spotted but not passed on can still become a missed breeding opportunity.
• A change in eating, cud-chewing or activity is a reason to look closer, not a diagnosis.
• A hypothetical extra $0.10 per cow per day after feed costs adds up to $4,575 across 150 cows for 305 days, before other costs.

1. Are Your Cows Eating the Ration You Put Out?

Can every cow reach what you've put out?

Start by checking what the cows can reach and what they leave behind, not just what went into the mixer. On your rounds, look at where the feed is sitting and whether the quieter cows are getting a fair chance.

Ask the person feeding whether anything changed today: a new silage face, a different load, a late delivery or more cows in the group. A short note now can explain a change you notice later.

University of Minnesota Extension advises checking the delivered feed against the intended ration and looking at the bunk between feedings. Leftovers can help you spot sorting and gaps in the feeding routine. Its transition-cow guidance also highlights mixing, delivery, feed access and water availability. Read the practical feeding guidance.

A useful cow monitoring routine connects what you see in the pen with what happened at feeding. It doesn't stop at ticking a box marked “fed.”

A heavier load doesn't always mean more feed

You know silage contains water. The question is how much of the load is feed after you take the water out. That's what your nutritionist means by dry matter.

Here's a simple illustration. Twenty kilograms of an ingredient at 40% dry matter contains 8 kg of dry matter. At 35%, the same 20 kg contains 7 kg. The scale shows the same weight, but the feed portion is 1 kg lower.

That doesn't mean you should immediately add more to the mix. It means a moisture change is worth discussing with your nutritionist before assuming the cows are receiving the same ration.

For a group intake estimate, subtract dry matter in leftovers and other feed removed or wasted from the dry matter delivered over the same period. Divide by the cows represented. Use dry matter on both sides of the calculation; a pen average won't tell you exactly what each cow ate.

Try this on tomorrow's rounds: use the five feeding questions below. Pick one time when the bunk doesn't normally get much attention, and see what it tells you.

Five questions to keep by the feeding record

• Did today's mix match the intended ration?
• Was feed still within reach before the next delivery?
• What did the cows leave behind?
• Did moisture, group numbers or timing change?
• Were feed and water access points working as expected?

Getting feed to the cows is the first check. The next question is what that feed is leaving in the milk check.

2. Is More Milk Leaving More Money After Feed?

What did the extra milk cost you?

Only if the extra milk pays for the extra feed and work behind it. A bigger milk check is welcome, but if feed and overtime went up too, compare the extra income with those costs before deciding the change has paid off.

Illustrative example: Anna's monthly review. On Anna's fictional 150-cow farm, milk receipts are up, but so is the feed bill. She asks her adviser to separate milk-price changes from extra production. Then they compare the money left after feed for the same groups. That gives Anna a better starting point than simply deciding that a fuller tank means a better month.

Your adviser may use two terms:

• Feed efficiency: how much energy-corrected milk the cows produce for the dry feed they eat. Energy-corrected milk allows for differences in milk fat and protein.
• Income over feed cost: milk income minus the feed bill. Put simply, it's the money left after feeding, before the other bills.

University of Wisconsin Extension explains why you need both views. A better feed-conversion ratio does not always leave more money after feed, and neither figure includes every cost of running the farm. See the explanation with worked examples.

Eating time isn't a weigh scale

Watching how long cows eat can help you notice a change. It doesn't tell you, by itself, how many kilograms went into each cow.

A 2026 study tested intake predictions on 320 cows across five research farms. It combined behavior, milk and cow records with weekly averages and group-intake calibration, under housed, total-mixed-ration conditions. Its practical lesson: estimating intake needs more than minutes at the bunk. Read the original intake study.

When someone shows you a feeding chart, ask what it measures: minutes, kilograms or an estimate. That question will save confusion later.

Feeding is one part of the margin. Breeding is another place where a small missed step can carry through into the next cycle.

3. Are Heats Being Missed, or Lost at Handover?

Spotting her is only the first step

Check both the observation and the handover. A cow may be seen on heat and still miss the next step if the note never reaches the right person. Keep the cow ID, time seen, breeding eligibility and person following up together.

DairyNZ says non-pregnant cows that are cycling normally commonly show heat every 18–24 days, averaging about 21 days. Its guidance also distinguishes missed heats from cows that aren't cycling normally. If too few eligible cows are being presented for insemination, those are different problems to investigate. Read the heat-detection guidance.

Don't judge the routine only by how many heats were written down. Check whether the cows were followed up, inseminated when appropriate and checked for the result.

Illustrative example: Mark's evening shift. On Mark's fictional farm, a worker writes a suspected heat on a scrap of paper. The evening shift doesn't see it. Mark changes the routine to one shared list, with a named person against each follow-up. He later checks whether fewer jobs were lost between shifts. The change is small; what matters is whether the job gets done.

Why a missed cycle can hurt the margin

Teagasc's 2021 analysis put the expected cost of a first-round missed heat at €106.50 with a 15-week breeding season and €149.50 with a 12-week season. Those figures came from Irish grass-based seasonal-calving systems and included later-calving effects and the chance of ending the season not in calf. See the original calculation.

They aren't a price tag for every missed heat on every farm. And a missed heat doesn't mean the cow suddenly gives no milk for 21 days. It can delay what happens next, with consequences that depend on your herd's breeding and calving pattern.

For a farmer's view, read this Slovenian family's story or watch their case video:

Watch the Slovenian farm's case video.

The same habit helps beyond breeding: notice the change, pass it on and check what happened next. That starts with knowing what is usual for the cow in front of you.

4. Which Cow Needs a Closer Look Today?

Is it one cow, or the whole group?

Look for a change from the cow's usual pattern, then check what might explain it. You know the cow that normally comes forward but hangs back today, or the group that suddenly looks different at feeding. Ask whether the change is individual or shared, and when it began.

Daily cow monitoring works best when a note includes a little background. “Off her usual feed” is a start; the cow ID, time, recent group move and what happened next make it much more useful.

DairyNZ recommends reading rumination trends alongside feed, weather, management changes and physical observations. Cud-chewing time varies, and different devices can report different totals. A change gives you a reason to investigate rather than a diagnosis on its own. Read the rumination guide.

Note the exception and pass it to the person who can act, so it doesn't disappear into yesterday's paperwork.

Your rounds give you that first-hand view. The gap is what happens between them, especially when the team is stretched.

5. Can Cow Monitoring Fill the Gaps Between Your Rounds?

It can help show what happened while you were busy elsewhere, provided someone uses the information to decide what to check next. Start with the gap in your routine: overnight observations, a shared record or keeping track of cows needing a second look.

Where cow activity monitoring can help

Cow activity monitoring adds a record of movement patterns to what you see on your rounds. Some wearable cow collars also report eating and cud-chewing patterns. These records can help staff review what happened between checks, but the useful question remains: what should we look at now?

Heat detection collars can flag patterns that may fit heat. Someone still needs to check the cow's records and follow the farm's breeding routine. A notification is not a confirmed pregnancy or a substitute for examining a cow that looks unwell.

If you've wondered, “How do cow collars work?”, the short answer is that a cattle collar sensor records signals such as movement. Software interprets those signals into behavior information. The measures reported, update interval and connection needed vary by system, so check what a particular device actually provides.

A dairy cow monitoring system can help collect repeated observations. As DairyNZ's wearable guidance explains, staff still need training, accurate records and a clear follow-up routine. Whichever method you use, make sure someone checks the cow and records the outcome.

A Sveaverken field example: check the record against the cow

At one Inner Mongolia dairy operation described in a Sveaverken case story, the wider herd numbered about 10,000 cattle. Staff could not watch every animal all the time, and the farm wanted clearer information about heat, eating and cud-chewing. The project team started with those daily pressures when planning a MooCollar Bree trial.

The published account describes testing with 100 Holstein cows from September to November 2023. It also reports 64 hours of manual behavior observations on 10 selected cows, compared with collar records reported every two hours. The 10,000-head figure describes the operation, not the number of cows in the trial. Read the Sveaverken field account.

The useful idea is to compare a record with what staff actually observe. When trying a monitoring method, agree which question it should answer, who will check its information and how you will judge the result. A busy screen is less useful than a short list the team knows how to act on.

Keep the note short enough to get written

Good herd monitoring is a team habit. A useful note should help the next person answer: which cow or group, what changed, what was checked and who is taking the next step?

What you notice	What helps the next person
A cow isn't eating as usual	Cow ID, time, what you saw and any recent changes
A suspected heat	Cow ID, observation time, eligibility and follow-up owner
A group leaves different feed	Group, mix/delivery notes, leftovers and timing
A job is still open	The person responsible and when it will be reviewed

Illustrative example: Louise's feeding round. In a fictional pen, Louise notices a change in several cows' eating patterns. Before asking for a new ration, she checks the feeding notes and recent group changes. The team finds that a revised schedule left a gap in its feed-access checks. They restore the check and watch what happens afterward. They've found a practical question to follow up, not proved an increase in milk.

A notebook, whiteboard or shared phone record can be enough to start. A cow monitoring system is useful only if its information reaches the people doing the work.

Check the result, not just the task

Writing “checked” closes a job, but doesn't tell you much later. Add a short outcome: no change found, another check planned, or referred to the vet under the farm's routine. A visibly unwell cow should be assessed promptly through your veterinary arrangements.

Over a few weeks, review which notes helped and which were too vague. You may find that better handover matters more than collecting another number.

Once the information reaches the right person, check whether the new routine is worth the work it adds.

6. How Do You Know a Change Is Paying Off?

Small daily gains can add up

Compare the extra value with everything extra you spent to get it. Here's an illustration, not a forecast: suppose a feeding change leaves an extra $0.10 per cow per day after feed costs, for 150 cows over 305 eligible days:

150 × 305 × $0.10 = $4,575.

If making the change also costs $800 in extra paid labor and $200 in supplies, the extra contribution after those costs is:

$4,575 − $800 − $200 = $3,575.

The improvement, herd size, days and costs are all assumptions. Replace them with your own figures. The example shows why a small daily margin is worth checking, not that a particular ration or tool will deliver it.

Compare ways of doing the job fairly

If you change your cow monitoring routine, put the old and new work on the same sheet. Include time for rounds, notes, checking alerts, maintaining tools and acting on findings. Compare a better manual routine with any equipment option, rather than assuming the current routine cannot improve.

Keep these questions beside the budget:

1. What was the problem before the change?
2. What result improved, over which cows and dates?
3. What extra bills or paid hours did the change need?
4. Did it save money, release time or both?
5. Did milk price, feed price or something else change too?

An hour saved is useful, but it isn't automatically an hour off the wage bill. If it goes into calf care or another job, record that use separately. Count a cash saving when overtime, outside help or another actual expense falls.

Avoid counting the same benefit twice. If an estimate of better breeding already includes later milk and replacement effects, don't add those again. The aim is a number you could explain across the kitchen table without losing anyone halfway through.

7. What Can You Improve Before Tomorrow's Milking?

Pick one recurring frustration and give somebody a clear next step. It might be feed out of reach, a heat lost at handover or a cow checked twice because nobody knew the first check was done. You can start there without overhauling the farm on Monday morning.

Give that problem an owner. Agree on one small change and decide what you will look at afterward. For a starting point, use the feeding questions or the handover table.

Try keeping a shared list for a month. Review whether the routine is being followed and whether staff find the notes useful. Breeding outcomes and longer-term financial changes will need a suitable follow-up period; a month is a starting point for checking the work.

Do I need new equipment to start?

No. Start with the observations and records already available. Add a tool when there is a clear information gap and somebody will use what it provides.

Does a busier feed bunk mean more milk is on the way?

Not necessarily. Look at feed access, what's being eaten, group changes and the milk records together. Time spent eating is not a direct measure of kilograms consumed.

Should I aim for the same cud-chewing time for every cow?

No single number tells the whole story. Compare a cow with her usual pattern and look at feed, recent events and what you see in front of you. Discuss persistent or worrying changes with the relevant adviser.

What's the simplest record to improve first?

Choose one that helps the next person do the job. Cow ID, observation time, what changed, who will follow up and a short outcome are a practical start.

Make the next round count

The point of cow monitoring is to make the next decision a little clearer. You see something, check what might explain it and make sure the right person follows through. Then you look back to see whether the change helped the cows and the business.

That might mean a better feeding check, a cleaner handover or a more useful breeding record. Your nutritionist, vet and business adviser can help where the question needs their expertise. You bring the daily knowledge of your herd.

Start with one routine your team can keep doing when the weather turns, somebody is off and the job list gets longer. Keep the notes short. Ask what happened afterward. And when you spend time or money on a change, check what it left behind after the extra costs.

You don't need a dashboard full of numbers to begin. You need a question worth asking on tomorrow's walk through the barn, and a way to make sure the answer doesn't get lost.