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Four experiments were conducted to compare the feeding value of rice to corn and sorghum grain. A 24-h in situ experiment (Exp. 1) revealed that polished white rice was degraded at a slower rate than corn in the rumen during the early stages but faster at 16 and 24 h, with 41% ruminally undegraded rice protein at 24 h compared with 58% for corn In Exp. 2, the digestibility of 72% corn or polished white rice diets was compared using four Hereford steers per diet. Energy digestibility was similar for the two diets but crude protein digestibility was lower (P<.05) for the rice diet. Six Angus crossbred steers per treatment were used to compare diets containing 100:0, 50:50, and 0:100% of the grain as sorghum grain or rough rice with rice hulls equalized in all diets. Steers fed the latter diet gained faster (P<.05) and had more (P<.05) fat over the 12th rib. Experiment 4 involved 60 steers randomly allotted to five diets in each of 2 yr; 100:0, 75:25, 50:50, 25:75, 0:100% of corn or polished white rice in the grain portion of the diets. Gains were similar for all diets except the 50:50 diet (P<.05), for which there is no explanation except low DMI (P<.05). These results suggest that polished white rice is equivalent to corn for finishing beef cattle. The feeding value of rough rice is reduced by the level of hulls.
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Reviewed by W. J. Clawson and H. W. Essig.
© 1995 American Registry of Professional Animal Scientists. Published by Elsevier Inc. All rights reserved.