Fig. 3
From: An alternative approach for sustainable sheep meat production: implications for food security
A schematic diagram showing the calculation of methane (CH4) emissions considering 4 scenarios that compares different amounts of dry matter intakes (DMI) for 800,000 ewes and their 1 million lamb progeny at 150% conception rate (i.e., 400,000 carry twins and 400,000 carry singles with 20% loss from gestation to weaning). For all 4 scenarios, the values for ewes were calculated at 3.0 kg or 2.5 kg DMI per day and for their progeny lambs at 1 kg or 2 kg DMI per day, but DM intakes of 11 million lambs were calculated at 2 kg DMI per day for all the 3-week of additional (extended) feeding. Methane emissions calculation was done based on the rate obtained for sheep grazing fresh grass dominated pasture reported by Swainson et al. [12] using 20.9 g CH4/kg DM intake for sheep more than 1 year old and 16.8 g CH4/kg DM intake for sheep less than 1 year old.