The highest CO2-e emissions were from scenarios I and VI. These
scenarios produced an average of 42.6 and 33.3 kg CO2-e/kg LWG,
respectively, with fattening periods of 840 and 660 days, respectively.
These scenarios had the lowest DMID with an average value
of 34.37%. Among all the grassland-based cattle farms, production
systems with DMID from 52 to 59% achieved the lowest CO2-e
emissions and highest feed conversion rate. This indicated that they
generated lower CH4 and N2O emissions per production system