“…(2021), in their studies, observed that the energy content increases the proportion of volatile fatty acids and consequently gas production (Karabulut et al, 2007). The mV for grains and concentrates is higher than that produced by green forages and stubbles (127-238 mL g -1 MO; Calabro et al, 2005) and, the mV of gas for the diets formulated for the intensive fattening of sheep, was similar to that found for grains or diets high in concentrates (Sánchez et al, 2019;Bueno et al, 2005). Table 3, shows the values of the fermentable fractions.…”