Print page content Print
Increase text size Decrease text size
Text Size


Helps boost average daily gain in suckling beef calves.


For suckling steers and heifers, SYNOVEX® C can help pack on pounds before weaning while delivering a strong return on investment. Calves implanted with SYNOVEX C:

  • Weaned an average of 19 pounds heavier than nonimplanted calves1
  • Delivered a 20:1 return on investment under most cattle pricing situations*,2
  • Approved for use in a feedlot re-implant program with SYNOVEX S after 70 days
Collapse All
  • A formulation tailored to suckling calves

    • Contains 100 mg of progesterone and 10 mg of estradiol benzoate
    • Works as a growth-promoting implant for cow/calf operations

    A flexible and convenient implant

    • Administered with the fixed-needle SYNOVEX® Revolver featuring a calf adapter to shorten needle penetration
    • Can be stored at room temperature until the package is opened

    Part of a broad portfolio of implants for every production stage

    • SYNOVEX S — An implant for steers weighing more than 400 lb.
    • SYNOVEX H — An implant for heifers weighing 400 lb. or more
    • SYNOVEX CHOICE® — An implant for feedlot steers and heifers
    • SYNOVEX PLUS® — The most potent implant available for feedlot steers and heifers

    Backed by the service and support you trust from Zoetis

    • The Implant Quality (IQ) program includes training and tools to maximize implant investment
    • The Zoetis Technical Services Team includes beef cattle nutritionists, veterinarians and meat scientists
    • Your local Zoetis representative can help determine how to incorporate SYNOVEX C into your cow/calf operation

    All SYNOVEX formulations are compatible with both the SX10 Precision Applicator and metal Revolver applicators.

  • SYNOVEX® C is approved for:

    • Increased rate of weight gain in suckling steer or heifer calves (including potential replacement heifers*) 45 days or older, up to 400 lb.
    • Increased weight gain in feedlot steers over 400 lb.; SYNOVEX C can be used as an initial implant, followed by implantation with SYNOVEX S approximately 70 days later.

    One implant (four pellets) is administered to each calf by subcutaneous implantation in the middle third of the ear.

    Do not use in veal calves.

  • synovex-fixed-needle-revolver

    SYNOVEX® C is easy to administer with the fixed-needle SYNOVEX Revolver, featuring a calf adapter to shorten needle penetration.

    To administer SYNOVEX C with the Revolver, follow the instructions in the package insert.

    English and Spanish training videos are conveniently available online to help educate employees on implanting techniques, sanitation and use of the Revolver.

    All SYNOVEX formulations are compatible with both the SX10 Precision Applicator and metal Revolver applicators.

  • The Implant Quality (IQ) program from Zoetis helps you get the most out of your SYNOVEX® C implant. It provides:

    • Establishment of implanting goals
    • Development of a customized quality assurance (QA) program to fit the operation’s goals
    • Training of crew members in correct sanitation and implanting techniques
    • Monitoring and analysis of results

    The program includes several useful tools:

    • Sanitation gear, including a disinfecting tray, sponge and ear brush, to help clean the ear prior to implanting
    • Service reports to assess implanting techniques of the processing crew and to check animals for implant retention three to four weeks later (available in paper or electronic formats)
    • Certificates of completion for all members of the processing crew

    Ask your local Zoetis representative how to get started with the IQ program.

  • *Based on average daily gain and feed efficiency demonstrated in Herschler study referenced below and May 30, 2014, CattleFax market and feed prices

    1 Data on file, 159-trial summary evaluating SYNOVEX use in more than 24,000 head of grazing cattle, Zoetis Inc.

    2 Herschler RC, Olmstead AW, Edwards AJ, et al. Production Responses to Variable Doses and Ratios of Estradiol Benzoate and Trenbolone Acetate Implants in Steers and Heifers. J Anim Sci. 1995; 73(10):2873-2881.

IMPORTANT SAFTEY INFORMATION: Do not use SYNOVEX products in veal calves. Refer to label for complete directions for use, precautions, and warnings.



My Video

Synovex implants how


My Video

Manufacturing Facility



We are Mon–Fri, 8:30am–8:00pm ET

This site is intended for U.S. Animal Healthcare Professionals. The product information provided in this site is intended only for residents of the United States. The products discussed herein may not have marketing authorization or may have different product labeling in different countries. The animal health information contained herein is provided for educational purposes only and is not intended to replace discussions with an animal healthcare professional. All decisions regarding the care of a veterinary patient must be made with an animal healthcare professional, considering the unique characteristics of the patient.

All trademarks are the property of Zoetis Services LLC or a related company or a licensor unless otherwise noted. ©2020 Zoetis Services LLC. All rights reserved.