Heat Detection: Catch More Heats, Get More Cows in Calf
Missing heats costs time, money, and months of progress. Whether you’re running a compact spring-calving suckler herd or managing a busy dairy yard, the goal is the same: spot heats accurately, serve at the right time, and keep cows moving forward.
This guide focuses on practical, low-hassle heat detection that works in real Irish conditions, plus a few simple tools that make the job easier.
Why heat detection is still the biggest fertility “lever”
Even with good bulls, good AI, and good nutrition, fertility performance often comes down to two things:
-
Are cows cycling? (post-calving recovery, body condition, minerals, health)
-
Are heats being picked up and acted on? (observation, timing, records)
If heats are missed or served at the wrong time, conception rates suffer and calving intervals drift.
Heat detection basics (without the textbook)
A cow in standing heat will typically:
-
Stand to be mounted (the clearest sign)
-
Mount other cows
-
Have rubbed tail heads / dirty flanks
-
Show clear mucus
-
Be restless, bellowing, sniffing
-
Spend less time eating and lying
The timing that matters
A simple rule of thumb many farmers use:
-
Serve about 12 hours after first standing heat (or follow your AI tech’s guidance)
If you’re not seeing standing heats consistently, that’s where tail paint and mount detector patches earn their keep.
Tail paint: the simple system that saves time
Tail paint is popular because it’s:
-
Quick to apply
-
Easy to read at a glance
-
A strong “visual cue” for staff and family helping out
How to use tail paint properly
-
Apply a strip on the tail head (not too wide)
-
Check it daily (twice daily in peak breeding)
-
Look for paint rubbed off / smeared as a sign of mounting activity
-
Reapply as needed
Products to consider
-
Flexmark Tail Paint (paint)
-
Flexmark Tail Paint Aerosol (spray)
-
Tell Tail Tail Paint (paint)
-
Tell Tail Tail Paint Aerosol (spray)
If you want the fastest routine: many herds use paint for the main application and aerosol for quick touch-ups.
Mount detector patches: great when labour is tight
If you’ve limited time for observation (or cows aren’t showing strong heats), mount detector patches can help.
Heat Seekers mount detector patches
These patches change appearance when the cow is mounted, giving a clear “yes/no” signal.
-
Heat Seekers product page: https://www.agridirect.ie/product/heat-seekers-mount-detector-patches/
-
Heat Seekers search page: https://www.agridirect.ie/?s=heat+seekers&post_type=product
Dairy vs suckler: what changes in practice?
The tools are the same, but the management focus can differ.
Dairy herds
-
More cows cycling at once, more pressure on labour
-
Missed heats add up quickly
-
A simple system (tail paint + patches on problem cows) can reduce “guessing”
Suckler herds
Heat detection is important, but fertility is often won or lost before breeding starts.
-
Post-calving recovery matters: cows need time and energy to cycle again
-
Body condition score (BCS) is key: too thin or too fat can delay cycling
-
Mineral status can influence performance (work with your vet/advisor)
If you’re seeing quiet heats or long gaps post-calving, it’s worth looking at nutrition, BCS, and health alongside heat detection.
A simple routine that works (and is easy to stick to)
-
Pick a system: tail paint for all cows, plus patches for repeats/quiet cows
-
Apply consistently (same place, same amount)
-
Check at set times daily
-
Record heats and services (even a notebook beats “memory”)
-
Review outcomes: repeats, empty cows, late calvers
Common mistakes (and quick fixes)
-
Paint applied too low / too wide → apply a neat strip on the tail head
-
Not checking often enough → set a daily routine (and stick to it)
-
Assuming every rubbed tail = heat → confirm with behaviour and timing
-
No records → you can’t improve what you don’t track
Shop heat detection essentials
If you want a straightforward setup that improves accuracy without adding hassle:
-
Tail paint options: Flexmark and Tell Tail (paint + aerosol)
-
Heat Seekers mount detector patches
Browse Heat Seekers here:
Quick note on advice
This article is general guidance. Always follow label instructions and work with your vet/AI technician/advisor for herd-specific fertility decisions.
