Pre-culture effect of Agaricus blazei and Valvariella volvac for rice straw on its ruminal degradation

Rice straw was treated with Agaricus blazei and Valvariella volvac in different periods. The in sacco degradation experiment was carried out to study the effect of pre-culture on improving straw degradation quality. The results showed that comparing with V. volvac treated and untreated groups, the DM degradability of A. blazei treated straw increased by about 15.17%(P＜0. 05) and 15.42％(P＜0. 05) respectively; and comparing with V. volvac treated group, the Heel and Cel contents in residue decreased by 8.03% (P＜0.05) and 7.83% (P＜0.05) respectively. The longer time A. blazei was euhured, the higher degradability was obtained. Dynamic of ruminal degradation revealed that the soluble proportion (a) and degradable proportion (b) of A. blazei treatment increased by 12.4％and 16. 8％respectively, and its degradation (c) improved by about 0. 0152. On the contrary, V. volvac treatment indicated no significant improvement in straw ruminal degradation quality (P＞0.05).