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Six ruminal-cannulated nonlactating Holstein Friesian cows (mean body weight660 ± 42.9 kg) were used to investigate the effect of soybean meal (SBM) supplementation on voluntary rice straw (RS) intake, feed particle size reduction, and passage kinetics in the rumen. They were allocated to two dietary treatments RS alone or RS supplemented with SBM. Voluntary dry matter intake of RS and total tract fiber digestibility was increased by SBM supplementation (p less then 0.05). Supplementation with SBM decreased rumination time per dietary