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(a) Variance component analysis of the effect of enteric methane emission (EME) yield (g methane/kg DMI) and feed conversion (kg dry matter intake (DMI)/kg milk yield (MY)) on EME intensity (g methane/kg MY), where EME intensity = EME yield × feed conversion, and relationship between (b) EME intensity and milk yield, (c) EME yield and milk yield, and (d) feed conversion and milk yield. RMSE = root-mean-square error. n = number of treatment means (from Table 1).
