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Hormonea
Dosage
Duration of Effect (days)
Growth Response
Potential Adverse Effects
TBA
200 mg (heifers, cull cows)
60–90
5%–12%
TBA + EB
200 mg TBA + 28 mg EB (steers, heifers)
90–120
10%–20%
Transient increase in sexual behavior
100 mg TBA + 14 mg EB (steers)
TBA + E
200 mg TBA + 20 mg E (steers, heifers)
120 mg TBA + 24 mg E (steers)
140 mg TBA + 14 mg E (heifers)
80 mg TBA + 16 mg E (steers)
80 mg TBA + 8 mg E (heifers)
40 mg TBA + 8 mg E (steers and heifers grazing pasture)
200 mg TBA + 40 mg E (steers)
200
Zeranol
36 mg zeranol
10%–15%
12 mg zeranol
MGA
0.25–0.5 mg/day, PO
As long as it is given
3%–10%
Increased mammary development after longterm administration
a TBA = trenbolone acetate; EB = estradiol benzoate; E = estradiol 17β; MGA = melengestrol acetate
Note: All administered as pellet implants except MGA, which is administered in feed.
