MSD Manual

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Natural Steroid Hormone Growth Promotants

Natural Steroid Hormone Growth Promotants

Hormone

Form

Dose

Duration of Effect (days)

Growth Response

Potential Adverse Effects

Estradiol and progesterone

Pellet

20 mg estradiol benzoate + 200 mg progesterone (steers)

100–120

10%–15%

Transient increase in sexual behavior

10 mg estradiol benzoate + 100 mg progesterone (veal calves)

100–120

0%–8%

--

Estradiol and testosterone

Pellet

20 mg estradiol benzoate + 200 mg testosterone propionate (heifers, cull cows)

100–120

5%–15%

Udder development

Estradiol

Silastic rubber

45 mg estradiol (steers)

365

10%–15%

Transient increase in sexual behavior

24 mg estradiol (steers)

200

10%–15%

Transient increase in sexual behavior

Polylactic acid

28 mg estradiol (steers)

365

10%–15%

Transient increase in sexual behavior

Note: Implants must be placed SC between the ear cartilage and skin to comply with label instructions so that consumption of residues may be avoided.