potentially degradable(b)and thedegradation rate constant(c)of‘b’ fraction by in sacco method in Small-Tail Han wether Sheep. The intercropping system of alfalfa and corn-rye provided higher forage production performance with net increases of 9.52% and 34.81% inDM yield, 42.13% and16.74% in crude protein(CP)yield,25.94% and 69.99% in degradable DM yield, and16.96% and5.50% in degradable CP yield than rotation and alfalfa sole cropping systems, respectively