CIDR® Devices (Cattle)

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  • Eazi-Breed CIDR® Cattle Devices contain the natural hormone progesterone. Intra-vaginally placed CIDR’s release progesterone at a controlled rate into the blood stream.

  • Breeding programs using the CIDR® Cattle Device can:

    • Tighten oestrus synchronization so animals come into oestrus in a narrow time period
    • Provide an opportunity to induce a fertile oestrus in non-cycling cows
    • Hasten the onset of cyclicity in maiden heifers
    • Treat cystic ovarian disease
    • Prepare donor recipient cattle for embryo transfer programs.

    Using CIDR® Cattle Devices can result in:

    • More pregnancies
    • More compact calving season
    • More even line of calves
    • Less involuntary culling of non-pregnant cows
    • Better use of time and labour during breeding, pregnancy testing and calving
    • Tighter calving intervals, with more calves born during a cow’s lifetime
    • Easier and more accurate heat detection, or the option of no heat detection
    • Enhanced use of artificial insemination (AI) or specialist programs such as ET, with
    • Greater genetic gain and higher value calves
    • Ability to schedule heifers to calve before older cows, so heifers can get extra attention
    • Easier customized matings – including the use of calving-ease sires – because AI is more feasible
    • Confirmed breeding and calving dates – not always possible with natural service
    • A more profitable herd


    1. Synchronization of Oestrus.
      • Insert for 7-12 days with injection of prostaglandin F2α at removal.
      • Animals normally come into oestrus 48-96 hours after removal.
      • A “heat mount detector” or tail paint for detecting oestrus is recommended.
    2. Treatment of Post-Partum Anoestrus.
      • In lactating dairy cows, when lack of ovarian activity is diagnosed, CIDR® is used in conjunction with GnRH and Lutalyse®.
      • In beef cows, when lack of ovarian activity is diagnosed, insert for 5-7 days and inject 1mg oestradiol benzoate 24-48 hours after device removal. Responsive animals will be detected in oestrus during the next 4 days. Re-examine and then retreat unresponsive animals.
    3. Re-synchronization of Oestrus.
      • Insert for 14-17 days after first insemination and remove on the 21st day post insemination. Animals not pregnant to the first service are in oestrus approx. 48-96 hours after device removal.
    4. Veterinary Specialist Use.
      • The veterinarian may use the plasma progesterone elevating properties of the CIDR® Cattle Device in a program specifically designed for the requirements of a particular herd. The device will elevate progesterone blood levels above 1.5ng/mL for at least 12 days. This level will drop below 1.5ng/mL in less than 1 hour after removal.


  • Wear protective gloves when handling the devices.

    • Insertion:
      1. Dip the device applicator in a non-irritating antiseptic solution.
      2. Place one device into the applicator so the wings are folded and only the tips of these wings protrude from the front of the applicator.
      3. Dip the front portion of the loaded applicator into a suitable veterinary obstetrical lubricant.
      4. Lift the tail of the animal and wipe the vulva lips clean with disposable tissue.
      5. With the tail lifted, insert the loaded applicator, sloping slightly upwards, through the vulva and then forward, without forcing, into the forward portion of the vagina.
      6. Release the removal tail, grasp the handle of the plunger and ease back the barrel of the applicator towards the handle.
      7. With the device correctly placed with the wings opened in the front portion of the vagina, only the removal tail should be hanging from the vulva.
      8. Repeat STEP 1 before re-using the applicator.
    • Removal:
      1. Withdraw each device by pulling on the removal tail.
      2. Always remove at least 24 hours before slaughter.


    • Storage:
      Store in a dry place below 30°C (room temperature).
    • Withholding periods:
      • Meat
      • Milk
    • Schedule


    P lastic bags containing 10 devices
    Applicators sold separately.

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