The nitrogen excretion rates (voided organic nitro- gen) are now animal specific. They are based on the volatile solid (VS) excretion instead of the American Society of Agricultural Engineers (ASAE) default N excretion rates (ASAE, 2003) only. Animal-specific VS:N ratios were calculated based on ASAE data and applied to the VS excretion estimations. These calcula- tions were done for each commodity and all age-sex categories.