Synthetic Steroidal and Nonsteroidal Estrogen Hormone Growth Promotants in Cattle and Sheep^a

TBA

200 mg (heifers)

60–90

5%–12%

TBA + EB

200 mg TBA + 28 mg EB (steers and heifers)

150–200

10%–20%

Transient increase in sexual behavior

Udder development

Vaginal and rectal prolapse

Ventral edema

100 mg TBA + 14 mg EB (steers and heifers)

100–140

10%–20%

Transient increase in sexual behavior

Udder development

Vaginal and rectal prolapse

Ventral edema

150 mg TBA + 21 mg EB (coated implant, steers and heifers grazing pasture)

180–200

10%–20%

200 mg TBA + 28 mg EB (coated implant, steers and heifers)

200

TBA + E

200 mg TBA + 20 mg E (steers and heifers)

80–120

200 mg TBA + 20 mg E (coated implant, heifers)

Initial and delayed release implant that provides hormonal payout for up to 200 days after implantation

200 mg TBA + 20 mg E (coated implant, steers)

Delayed release implant that does not begin hormonal payout until ~70 days after implantation

200 mg TBA + 40 mg E (coated implant, steers)

Initial and delayed release implant that provides hormonal payout for up to 200 days after implantation

120 mg TBA + 24 mg E (steers)

100–140

140 mg TBA + 14 mg E (heifers)

100–140

80 mg TBA + 16 mg E (steers)

100–140

80 mg TBA + 8 mg E (heifers)

100–140

40 mg TBA + 8 mg E (steers and heifers grazing pasture)

100–140

Zeranol

36 mg

70–100

10%–15%

)12 mg

90–120

10%–15%

Melengestrol acetate

0.25–0.50 mg/day (heifers)

For the intended duration

3%–10%

Increased mammary development after long-term administration