Keywords: تولید گاز وابسته; Caecal; Colon; Equine; Faeces; In vitro; A; asymptotic gas production; B; half time of asymptotic gas production; BP; unmolassed sugar beet pulp; FDG; freeze-dried grass; GI; gastrointestinal; GP; gas production; HDG; high-temperature dried grass; IVGPT;