Do Dry Dairy Cows Need More Rest Before Calving?

By Dr Duncan Houston

The final weeks before calving are one of the most important periods in dairy production. This is when the cow is preparing for lactation, supporting a rapidly developing calf, adapting metabolically, and moving through one of the highest-risk transition periods in the entire production cycle.

When things go well, you get a smoother calving, a healthier cow, and a stronger calf. When things go badly, you can see stillbirth, metabolic disease, poor early lactation performance, and a much harder recovery period.

One factor that deserves more attention is rest.

A study from Ohio State looked at dry cows in the period before calving and found that cows delivering live calves tended to spend more time lying down in the days before calving than cows that experienced stillbirth or calf loss shortly after birth. The difference was not trivial. It suggests that lying time may be more than a comfort measure. It may be a practical indicator of transition cow health and calving success.

This article explains what that means, why it matters, and what producers can do to improve cow comfort, reduce metabolic stress, and support better calving outcomes.

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Quick Answer

Dry dairy cows that spend more time lying down in the period before calving may be more likely to deliver live calves, especially in older cows. Rest is closely linked to comfort, stress, metabolic balance, and overall transition health. Improving bedding, reducing overcrowding, managing grouping carefully, and monitoring metabolic risk can all help support better calving outcomes.

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Why Rest Matters in the Late Dry Period

The dry period is not just a break from milking. It is a preparation phase for one of the biggest physiological shifts in the cow’s life.

In the last few weeks before calving, the cow is dealing with:

• rapid fetal growth

• changes in feed intake

• mammary preparation for lactation

• increased metabolic demand

• social and environmental stress if housing is poor

During this time, lying behaviour reflects more than laziness or preference. It reflects how comfortable, stable, and physically capable the cow is.

A cow that lies down well is generally more likely to be:

• comfortable in her environment

• less affected by social competition

• better able to ruminate

• under less physical and metabolic strain

A cow that stands excessively, shifts repeatedly, or shows inconsistent resting patterns may be telling you that something is off, even before obvious clinical disease appears.

That is what makes lying time so useful. It can be both a welfare marker and an early warning sign.

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What the Study Looked At

Ohio State researchers monitored more than 1,000 dairy cows during the 14 days before calving using electronic systems that tracked lying behaviour. They assessed not just total lying time, but also the consistency of lying patterns using the coefficient of variation, which helps show how stable or irregular the cow’s behaviour was from day to day.

They also measured key metabolic indicators around calving, including:

• non-esterified fatty acids, or NEFA

• calcium levels

The goal was to understand whether pre-calving behaviour and metabolic status were associated with calf survival.

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Key Findings

The study found several important patterns.

Cows that delivered live calves spent nearly one hour more per day lying down in the week before calving compared with cows whose calves were stillborn or died within 24 hours of birth. Around 5 percent of calves in the monitored group were stillborn or died shortly after calving. In older cows, those associated with stillbirth had higher pre-calving NEFA levels, suggesting greater metabolic stress. This pattern was not seen the same way in heifers.

What this means clinically

This does not prove that more lying time directly causes better calf survival.

But it strongly suggests that cows resting better before calving are often in a better overall physiological state.

That matters because stillbirth risk is rarely about one single factor. It is usually the result of multiple pressures coming together, including:

• poor comfort

• social stress

• metabolic imbalance

• reduced feed intake

• difficult calving

• poor transition management

Rest may be one of the clearest outward signs that these systems are either coping well or starting to fail.

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The Link Between Lying Time and Metabolic Health

One of the most useful parts of this study is the connection between lying behaviour and metabolic status.

NEFA and why it matters

Non-esterified fatty acids rise when cows are mobilising body fat because energy demand is outpacing intake. That means the cow is entering negative energy balance and pulling from body reserves.

A rise in NEFA before calving can be a warning sign for:

• excessive metabolic stress

• reduced immune function

• poorer transition performance

• increased risk of calving and postpartum problems

In practical terms, higher NEFA means the cow is under metabolic pressure.

If that cow is also standing more, resting less, or showing inconsistent lying patterns, it raises concern that she is not coping well in the transition period.

Rest supports core physiological functions

Adequate lying time supports:

• rumination

• blood flow to the udder

• hoof comfort

• muscle recovery

• reduced standing stress

• more stable behaviour

A comfortable cow is more likely to eat, ruminate, and recover properly between bouts of activity.

A restless cow is more likely to be:

• sore

• socially displaced

• heat stressed

• metabolically strained

• uncomfortable on the bedding surface

This is where rest becomes more than a nice extra. It becomes part of the production system.

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Why Older Cows May Be More Affected

The study found that the association between higher NEFA and stillbirth was more apparent in older cows than in heifers.

That makes clinical sense.

Older cows often face greater cumulative strain because they may have:

• more social competition

• greater body weight and joint stress

• previous calving injuries or changes

• a more complex metabolic history

• higher production pressure

They may also be less forgiving of poor housing or overstocking.

Heifers have their own transition challenges, but older cows can be hit harder by compounding metabolic and comfort issues. That means close-up management cannot be one-size-fits-all.

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Why Cow Comfort Before Calving Is So Important

The mistake many farms make is focusing only on disease after calving while underestimating the pre-calving environment.

What happens in the final 2 to 3 weeks before calving influences:

• calving ease

• calf vitality

• fresh cow health

• feed intake after calving

• milk production

• risk of metabolic disease

If the cow cannot rest properly during that time, everything becomes harder.

In practice, poor rest is often driven by management problems such as:

• overcrowding

• hard or wet bedding

• frequent pen moves

• excessive regrouping

• heat stress

• poor stall design

• difficult access to feed and water

You do not need a sick cow to have a compromised cow. Sometimes the early sign is simply that she is not lying well.

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Optimising Lying Behaviour and Bedding Comfort

If you want cows to lie down more, the environment has to make it easy.

Bedding depth and softness

Deep, dry bedding is one of the most powerful tools for improving lying time.

The source material suggests aiming for at least 10 cm of bedding depth, whether using sand, compost, or other suitable bedding systems. Softer surfaces reduce pressure on joints, improve comfort, and encourage longer lying bouts.

What matters most is not just the material, but the outcome:

• is it soft enough

• is it dry enough

• is it clean enough

• is it maintained consistently

Wet or compacted bedding quickly stops being a comfort tool and becomes a disease and welfare problem.

Bedding maintenance

Frequent grooming and refreshment matter.

If bedding becomes:

• hard

• soiled

• slick

• damp

cows will spend less time lying comfortably, even if the stall or yard technically looks acceptable.

Flooring and under-surface support

Concrete is durable, but cows do not love it.

Where concrete is present, rubber matting or suitable surface improvement can help reduce discomfort and improve confidence in lying down and rising.

This is particularly important in heavier dry cows and older cows with more joint and hoof stress.

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Space Allowance and Stocking Density

Overcrowding is one of the most reliable ways to reduce lying time.

When cows do not have enough room, you see:

• more standing

• more competition

• more displacement

• more interrupted rest

• less feeding stability

• more stress

The source text recommends allowing at least 100 square feet per dry cow. Whether using that exact figure or adapting it to your system, the principle is clear: close-up cows need space.

The real issue with overcrowding

Overcrowding does not just reduce comfort. It disrupts the whole transition rhythm.

A close-up cow needs reliable access to:

• lying space

• feed space

• water

• low-conflict movement

If she has to compete for those basics, the cost often shows up later in:

• reduced intake

• worse metabolic adaptation

• more calving problems

• poorer calf outcomes

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Grouping and Movement Matter More Than Many Farms Realise

Dry cows are very sensitive to social disruption.

Late pregnancy is not the ideal time to keep moving animals around unless there is a clear reason.

Stable grouping

Keeping dry cows in stable groups helps reduce:

• social stress

• fighting and displacement

• confusion

• reduced rest after regrouping

Avoid excessive pen changes

Frequent regrouping in the late dry period can reduce lying time and increase stress. Every regrouping event changes the social order, and cows often pay for that with less feeding and less rest.

Timing of movement to calving pens

The source notes that where movement is needed, shifting cows to birthing pens 1 to 2 days before calving may be preferable to moving them much earlier.

That is sensible because moving too early can create prolonged disruption, while moving too late can be impractical or unsafe. The exact timing depends on the system, but the broader principle is this:

Make fewer moves, make them calmer, and make them count.

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Low-Stress Handling

You can have excellent bedding and still undermine the whole system with rough handling.

Pre-calving cows benefit from:

• calm movement

• low noise

• predictable routines

• minimal rushing

• gentle stockmanship

The closer a cow gets to calving, the less tolerance she has for unnecessary disturbance.

The farms that do this well often look boring from the outside. That is usually a good sign.

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Monitoring Rest and Metabolic Indicators

You cannot manage what you never measure.

Electronic monitoring

Activity monitors can help detect:

• total lying time

• changes in resting behaviour

• unusual restlessness

• deviations from normal patterns

This can be especially useful in larger herds where visual assessment alone misses subtle changes.

Visual observation

Technology helps, but direct observation still matters.

Watch for cows that:

• stand for long periods without settling

• repeatedly lie down and get up

• isolate or avoid competition

• appear uncomfortable rising or lowering themselves

• spend less time resting than pen-mates

These may be the cows struggling most.

Metabolic monitoring

The source highlights monitoring NEFA 1 to 2 weeks before calving and calcium around 48 hours after calving. High NEFA can indicate energy imbalance before freshening, while calcium helps assess transition adaptation after calving.

This is useful because it links behaviour to physiology.

A cow that is resting poorly and showing metabolic warning signs deserves more attention than a cow who is just having an off day.

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Feeding and Nutrition to Support Rest and Transition Health

Good rest and good nutrition work together.

A cow that is metabolically stable is more likely to rest well.
A cow that rests well is more likely to maintain better transition performance.

Body condition score

The source recommends maintaining a body condition score of around 3.0 to 3.5. Overconditioned and underconditioned cows are both more vulnerable to transition problems.

• Underconditioned cows may lack reserves and resilience

• Overconditioned cows are at greater risk of excessive fat mobilisation and metabolic disease

Avoid excessive negative energy balance

Close-up feeding should aim to support intake and minimise the depth of negative energy balance.

That means:

• balanced energy density

• good palatability

• consistent feed access

• minimal competition

DCAD and anionic salts

The source notes the use of anionic salts and DCAD balancing 2 to 3 weeks before calving to support calcium mobilisation.

This matters because a cow struggling with calcium dynamics is less likely to transition smoothly, more likely to feel weak or uncomfortable, and more likely to show reduced performance after calving.

Fibre and rumination

Effective fibre, such as suitable hay or straw inclusion depending on the ration design, helps support rumination and transition stability. A well-ruminating cow is generally a more stable cow.

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Decision Checkpoints for Farmers and Managers

These are the kinds of practical questions that matter in the final 3 weeks before calving.

If your close-up cows are standing more than usual, ask why.
Do not assume it is normal.

If cows are repeatedly displaced from resting areas or feed space, you likely have a comfort or stocking issue.

If older cows seem less settled than heifers, manage them accordingly rather than treating all dry cows the same.

If NEFA is running high in pre-calving cows, do not only blame the ration. Look at stress, rest, pen dynamics, and access to resources as well.

If stillbirths are creeping up, review transition cow comfort, not just calving assistance protocols.

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Common Mistakes

1. Treating rest as a luxury instead of a production factor

Rest is not a bonus. It is part of the biological system that supports calf survival and fresh cow performance.

2. Overcrowding close-up pens

This is one of the fastest ways to reduce lying time and increase transition stress.

3. Focusing only on feed and ignoring comfort

A good ration cannot fully compensate for poor bedding, poor space, or poor grouping.

4. Moving cows too often before calving

Too many social disruptions in the late dry period make cows less stable.

5. Ignoring older cows as a higher-risk group

Multiparous cows often show the consequences of poor transition management more clearly.

6. Waiting until after calving to investigate problems

By then, much of the damage has already been done.

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Prevention: What Helps Most

The most effective approach is not one magic fix. It is a better close-up system.

Focus on:

• deep, dry, clean bedding

• enough lying and feed space

• stable group structure

• minimal pen moves

• calm handling

• strong close-up nutrition

• monitoring of metabolic risk

• early attention to cows showing altered behaviour

This is where good transition management earns its keep.

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When Should You Worry More?

Treat this as a bigger concern when you are seeing:

• rising stillbirth rates

• more difficult calvings

• more restless close-up cows

• poor fresh cow appetite

• elevated NEFA in transition groups

• older cows struggling more than the rest of the pen

Any one of those can be manageable. Several together usually mean the system needs review.

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FAQ

Does more lying time cause better calving outcomes?

Not necessarily directly, but it appears to be a strong indicator of better comfort, lower stress, and improved transition health, which all support better outcomes.

How much extra lying time mattered in the study?

Cows delivering live calves rested nearly one hour more per day in the week before calving than cows associated with stillbirth or calf loss within 24 hours.

Are older cows affected differently from heifers?

Yes. In the study, older cows with stillbirth were more likely to have higher NEFA levels before calving, suggesting greater metabolic strain.

Should I monitor NEFA in dry cows?

It can be very useful in high-risk herds or where transition problems are increasing, especially when interpreted alongside behaviour and body condition.

Is bedding really that important?

Yes. Poor bedding reduces lying time, increases discomfort, and contributes to transition stress.

When should cows be moved to calving pens?

Where movement is needed, 1 to 2 days before calving may be more appropriate than shifting much earlier, but this depends on the system and how well cows handle regrouping.

Can activity monitors actually help?

Yes. They can identify changes in behaviour earlier than casual observation alone, especially in larger herds.

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Final Thoughts

The close-up dry period is where a lot of calf and cow outcomes are quietly decided.

If a cow is comfortable, calm, well-fed, and resting properly, she is usually in a better position to calve well and deliver a stronger live calf. If she is standing too much, unsettled, metabolically strained, or constantly competing for space, that pressure often shows up at calving or just after it.

Rest is not the whole story, but it is a very useful window into how well the transition system is functioning.

The farms that get this right are not just giving cows more time to lie down. They are building an environment where cows are able to cope better with one of the most demanding periods of their production cycle.

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If you want help reviewing dry cow comfort, transition management, metabolic monitoring, or stillbirth risk on your farm, ASK A VET™ can help you work through the practical weak points and build a calmer, stronger pre-calving system.