In vitro dry matter digestibility of mixtures of rice straw and several feeds

In vitro dry matter digestibility(IVDMD) was used to estimate the quality of Rumex patientia (RP), Astragalus sinicus (AS), Sorghum hybrid Sudangrass (SHS), S.sudanense (SS), Pennisetum purputeum cv.mott (PPM), Medicago sativa (MS), cassoa hay (CH), rice hay (RS), ammoniated rice hay (ARS) and cassava residues(%,DM), and IVDMD was in order: CR(77.6)RP(61.32)MS(55.26)AS(54.91)MS(52.97)SHS(40.24)PPM(38.70)ARS(36.88)SS(34.15)RS(26.63). Except for AS and MS, IVDMD was significant difference (P0.05) among other feeds. Associative effectiveness (AE) was defined as the difference between the measured IVDMD of mixtures and the weight sum of the individual feeds. Six mixtures (60%RS+10%CR+30X1, X1 was RP，AS，SHS，SS，PPM，MS，CH and ARS; 60%ARS+0.1%CR+0.3%X2, X2 was RP，AS，SHS，SS，PPM，MS and CH; 60%ARS+20%SS+20%X3，X3 was RP，AS，SHS，SS，PPM，MS and CH; 50%ARS+20%SS+30%X4，X4 was the same as X3; 60%RS+20%SS+20%X5，X5 was RP，AS，SHS，PPM，MS，CH，ARS and CR; 50%RS+20%SS+30%X6, X6 was the same as X5) were used to measure the associative effect AE. Positive AE were observed for all mixtures (P0.05) and addition of MS was the best. CH was a good supplement because its effectiveness was better than grasses and early equaled to legumes. Supplement for RS was better than that for ARS.