Feeding strategy NITR. A nitrate source (5Ca(NO3)2∙NH4NO3∙10H2O; 75 % NO3 in DM) was added at 1% of
dietary DM. Table 2 shows feed characteristics of this nitrate source. The effect of nitrate on enteric CH4 production
was based on Van Zijderveld (2011). Stoichiometrically, a reduction in CH4 of 0.258 g/g nitrate is expected.
In vivo, efficiency of CH4 reduction decreases with increased levels of nitrate intake according to Eq. 2.