The fermentation duration could be divided into three stages: the initial fermentation stage (0 d–18 d), the mid-fermentation stage (18 d–30 d) and the end-fermentation stage (30 d–40 d)
The fermentation duration could be divided into three stages: the initialfermentation stage (0 d–18 d), the mid-fermentation stage (18 d–30 d)and the end-fermentation stage (30 d–40 d)