Synovex H : 100ds

ZOETIS SKU: 107304


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Synovex H from Zoetiz/Pfizer is recommended for use in heifers (H) weighing 400 lbs. or more for increased weight gain and improved feed efficiency. Each dose consists of 8 pellets containing 200 mg testosterone propionate and 20 mg estradiol benzaate. Do not refrigerate. Not for dairy or replacement heifers. No withdrawal. Implant gun must be purchased separately!

Studies show that Synovex H is effective approximately 120 days. Implant complete contents of one cartridge cell per heifer. Approved implantation technique is fully described in the package insert. 
A withdrawal period has not been established for this product in pre-ruminating calves. Do not use in calves to be processed for veal. Caution: Bulling, vaginal and rectal prolapse, udder development, ventral edema and elevated tailheads have been occasionally reported in heifers administered with Synovex H implants.

Synovex H Heifer Implants contain two pure steroid hormones, testosterone propionate and estradiol benzoate. This formulation provides a complementary amount of each hormone for maximal growth stimulation.


This product is approved for use in cattle only. Attempts to use the product in any other a manner violate federal, state, and local laws. By purchasing this product you agree to use this product in the manner for which is intended and in accordance with the label instructions. Failure to follow label instructions are beyond the control of Livestock Concepts and are, therefore, the responsibility of the buyer.


Step 1: Loading the SX-10 gun 

Load the SX10 gun following the directions outlined in the instruction manual accompanying each SX10 gun. 

Step 2: Restraint

The animal must be confined in a restraint mechanism (squeeze chute or head gate). The implant site on the back of the ear should be prepared by scrubbing with a generous-sized piece of cotton that has been soaked in a germicidal solution.
If implanting horned cattle, greater safety is provided when the head is controlled by the use of a bull lead (nose tongs).

Step 3: Implant Site 

Divide the ear into three imaginary sections as illustrated. The implanted pellets should be deposited in the center one-third of the ear as shown. To accomplish this, the SX10 gun needle should be inserted in the outer one-third of the ear as indicated by the “X” in the illustration. Implanting too close to the head may cause abnormal sexual behavior. Care should be taken to avoid severing the major arteries of the ear.

Step 4: Insert Needle 

Just before grasping the ear with one hand, release the safety by striking the butt of the gun. Holding the SX10 gun firmly with the other hand, penetrate the skin at the point shown by the “X”. Thrust the needle under the skin taking care not to penetrate the cartilage. Ease the SX10 gun forward (toward the base of the ear) until the full needle length is beneath the skin.

Step 5: Pellet Implantation 

When the needle is completely inserted, activate the instrument by squeezing the trigger completely. Do not withdraw the needle, but allow the automatic needle retractor to release the pellets. This will allow the pellets to be deposited in a straight line in the path of the retracted needle.

Step 6: Inspection 

Check the implant site. If properly administered, the implants should lie in a straight line under the skin.
Disinfect the SX10 gun needle in a germicidal solution and recock the instrument by rotating the cocking grip left, pull back, rotate right, then push all the way forward. You are now ready to implant the next animal.

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