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Methane emission per unit of energy-corrected milk of dairy cows treated with 3-nitrooxypropanol (3NOP). Control = 0 mg/kg of 3NOP, Low3NOP = 40 mg/kg of 3NOP, Medium3NOP = 60 mg/kg 3NOP, and High3NOP = 80 mg/kg 3NOP (dietary dry matter basis). Methane emission was measured using the GreenFeed system (C-Lock, Inc.). Data are treatment means and bars represent SE; n = 12 (number of independent data points for each mean value).
