Feed melengastral acetate (MGA) or spay the heifers. The best option depends on numbers and whether you can manage the separate supplement with MGA for the beef heifers. MGA is approved for use in beef heifers fed in confinement for slaughter at .25 to .5 milligrams per heifer per day. Consult a current feed additive compendium.
Target 0.4 to 0.5 mg per heifer per day from arrival until market. This will need to be in the supplement, then mixed in the total ration. Rumensin and Tylan could both be fed with MGA, or Bovatec can be fed with MGA. Many use Rumesin and Tylan, and feed at approved levels. Rumensin is approved for 50 to 360 mg daily or 5-30 gallons per ton of 90 percent DM feed (target 280 to 300 mg/heifer), and Tylan is approved for 90 mg/heifer/d or 8-10 g/ton of 90 percent DM feed. You can use Bovatec, but again there are specific amounts that are approved and should be followed.
So, feed 0.5 mg of MGA, 280 mg of Rumensin and 90 mg of Tylan. These can all be provided in one supplement. Just be sure that you have consulted a current compendium and that the gallons per ton are approved amounts.
Fed MGA to prevent cycling. As for implants, Revalor-200, Revalor-H, Revalor IH, Synovex-H, Synovex Plus, and Finaplix are all possibilities, but consult your nutritionist of beef specialist for the most-recent information.
