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Ridgway, IL | I believe the efficiency gains from rumensin are quoted between 5-10%. If feed cost is 140/dry matter ton, and you are comparing 7.5:1 to 6.75:1, then the rumensin is dropping cost of gain by 5.25 cents per pound. On a calf fed from 550lb to 1250lb that is worth around 40$ per head.
The lack of implant would be the bigger deal. Several study's showing a rev-xs or similar 2 implant strategy, gains you 75-125lb vs no implant on a 240 day calf fed feeding period. At 1.60/lb = 120-200$ per head. Plus there is some gain in feed efficiency.
Throw in the inconvenience of no antibiotics, and I say it's a break even offer.
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would you feed cattle without Rumensin ?
