This experiment was conducted to study the dynamic variation rule of crude protein content of 15 mulberry varieties for feed use in different growth periods in Chongqing Region. A total of 15 different varieties of two-year-old mulberry for feed use were used as experimental materials, and the crude protein content in their leaves in three different growth stages, including germination period, vigorous growth period and slow growth period were determined, respectively. The results showed that in the germina...