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Digestibility and Nitrogen Utilization of Rolled and Moist-Heat-Treated Sorghum Grain ¹

Department of Dairy and Poultry Science, Kansas State University, Manhattan

ABSTRACT

Roll cracked and moist-heat treated sorghum grains were compared at two feeding levels in a 5 x 5 Latin-square digestion and nitrogen balance trial, using yearling dairy steers. The roughage ration consisted of alfalfa and prairie hays in one to three ratio. Grains were substituted for hay in quantities calculated to supply 22 and 66% of ration net energy. Crude fiber digestibility of the ration was depressed by the heat-treated grain at the high feeding level. Protein digestibility of the high-grain ration was depressed by heat treatment. Nitrogen balance was not influenced by grain treatment, but a greater proportion of ingested nitrogen was absorbed from the cracked-grain ration at the high-grain level and voided in the urine.

¹ Contribution no 633, Department of Dairy and Poultry Science, Kansas Agricultural Experiment Station, Manhattan.