The study was conducted to investigate the effect of addition of alfalfa saponins in dietary on rumen fer- mentation of growing goats in vitro culture.The addition levels of alfalfa saponins were 0 % (control group),1 %,2 %, 3 % and 4 % of substrate respectively.The results showed:Alfalfa saponins did not affect pH value and the concentration of protozoon protein;Adding alfalfa saponins could increase the concentration of NH3-N in each treatment group,but only the 4 % treatment group was significantly highe...