Values in the same row with different superscripts with differ (Pb0.05); NS=no significant different; *=Pb0.05; SEM=standard error of the mean;
ULTS=urea–lime treated rice straw; R=roughage sources (rice straw vs. ULTS); U=urea level (0% vs. 4% urea); A=animal species (cattle vs. swamp buffalo).