CRV Estrotect™ Heat Detectors with Breeding Patch

Product benefits

Estrotect heat detectors
  • Know when its time to breed with the Breeding Patch
  • Easy to use, self-adhesive
  • Stays in place in rain, snow or heat

Don’t just detect cows for heat

The newly redesigned ESTROTECT™ Breeding Indicator features breeding patch technology that indicates when cows are ready to breed, helps confirm pregnancies and provides pinpoint timing for AI protocols!

They are a 11cm x 4.5cm rectangular patch that is stuck on between the hip and the tail end of the cow. As mounting activity occurs, the ESTROTECT Breeding Indicator’s silver and black surface ink is rubbed off by the friction and will reveal the indicator colour (red/orange, green, blue, yellow or fuchsia).

Estrotect Heat detectors, available in 5 colours

Colours available are: Fuchsia, Red, Yellow, Blue or Green

Increase confirmed pregnancy rates

When activated the precision designed Breeding Patch indicates when cows are in optimal estrus to be bred. Third-party research has shown that when the breeding patch – or equivalent surface area – is rubbed off, confirmed pregnancy rates can be increase by up to three times!

Accurate results

  • Only one patch per cycle is required compared with alternative tail paints and paint sticks, which must be applied or touched up regularly.
  • While other detectors are activated by one mount (sometimes for as little as three seconds) CRV Estrotect™ Heat Detectors work gradually exposing the indicator colour, giving you more accurate results.
  • With the new Breeding Patch it’s very simple to use. Once the patch is 50% rubbed it’s time to breed.

Born from university research

The ESTROTECT™ Breeding Patch technology was born from university research. After testing the Breeding Patch on thousands of cows and heifers, researchers developed a patch scoring system with scores from 1 to 4.

Higher scores equate to higher estrus intensity and therefore, better chances for a successful pregnancy. Research showed that cows with scores 3 and 4, the equivalent of the Breeding Patch or greater, should be bred because they’ve reached peak estrus. In multiple studies from the U.S. and Brazil, pregnancy establishment increased and pregnancy loss decreased when the Breeding Patch was rubbed away.


accurate heat detection

Ultimately, the scoring system shows estrus intensity. The higher the estrus activity the higher are your chances of a successful pregnancy.


Help Confirm Pregnancy Status

Here’s how you can use ESTROTECT Breeding indicators to help confirm pregnancy status in your herd:

After your AB breeding programme or after bulls are removed from the herd, apply ESTROTECT breeding indicators to your cows or heifers.


  • Monitor your cows daily over an 18-to-26-day period (the typical length of an estrous cycle in a cow).
  • If the ESTROTECT Breeding indicator has not been activated, there is a high likelihood the cow or heifer is pregnant. This can be confirmed with another test like ultrasound or milk testing after the end of the mating season.

If the ESTROTECT Breeding Indicator shows at least 50% of the fluorescent signal layer over this time, the cow has been mounted multiple times and is likely to not be pregnant.

Learn more about the science behind Estrotect at

Confirm your herds pregnancy status with Estrotect

Apply in 5 easy steps

1. Warm

Heat activates adhesive. Store at or above human body temperature (37ºC) when about to apply.

2. Site

An ideal location for placement is between the hip and tail end, perpendicular to the spine.

3. Brush

Brush with the grain of the hair to remove dirt, dust and shedding or moulting hair. It’s recommended to only use the Estrotect rubber brush.

4. Clean

Clean the area with an Estrotect cleaning cloth to completely remove any remaining dirt dust or sand.

5. Apply

Place the detector across the spine of the cow, press down firmly and rub into the hair with bare fingers.

CRV Estrotect heat detectors

Estrotect Pricing  
Pack of 50 patches $112.50
Estrotect Brush $9.50
Estrotect Cloth $1.50
Estrotect Chilly bin $8.50

Colours available are: Fushia, Red, Yellow, Blue or Green



Dairy farmer Jeffrey Price has been using CRV Estrotect™ Heat Detectors for the last two mating seasons. He currently milks over 400 cows on his family’s farm in Thames and says they are quick and easy to use.   “Some farmers worry that the patch might come off when the cows are mounted, but they don’t. They stay on the cow and do the job without fuss or mess. In Spring last year, I tried tail paint and CRV Estrotect™ Heat Detectors together to see what would respond and what wouldn’t. Estrotects went off first allowing us to mate the cows at the start of their cycle, giving the insemination the best chance of success.” said Mr Price.
 I don’t touch paint anymore.”

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