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Utilization of Rice Hulls in Cattle Finishing Rations

Oklahoma State University and Texas Technological College^,3

Abstract

The practice of finishing beef cattle in feedlots is growing rapidly in many sections of the United States. Difficulties in mechanization and transportation of roughages have caused these to be expensive and has stimulated interest in the use of fattening-type rations containing 90 to 100% concentrates. An important source of roughage in such rations has been cottonseed hulls, which are in short supply. Rice hulls, which are plentiful in supply, have not found ready use in livestock feeding because their use has sometimes caused harmful effects (Browne, 1904; Wahed, 1965; Feiger, Chopping and Tucker, 1947) in cattle fed high-roughage levels. Further work has indicated that ground rice hulls are not injurious to cattle (Rusoff, Frye and Epps, 1956) when the level does not exceed 30% of the diet. Recently, it was discovered that ground rice hulls, when heated in the presence of ammonia and catalysts, would absorb ammonia resulting in a product containing about 1.6% nitrogen.

¹ Department of Animal Sciences and Industry, Oklahoma State University, Stillwater.

² Research Farm, Pantex, Texas, a part of The Texas Technological College, Lubbock.

³ Partial financial support provided by the Riviana Foods, Inc., Houston, Texas.