Abstract
ABSTRACT The objective of this experiment was to determine the effect of varying the dietary degradable protein balance (DPB) on finishing cattle performance. Crossbred yearling steers (n = 300; BW = 460 ± 26 kg) were allotted to 12 pens (25 steers/pen) and fed barley grain-based finishing diets with negative DPB (− 12 g/kg of DM), neutral DPB (0 g/ kg of DM), or positive DPB (14 g/kg of DM). The diet with negative DPB contained 88.3% barley grain and 4.7% barley silage. For the neutral and positive DPB diets, 11 and 22% of dietary barley grain, respectively, was replaced by wheat-based dried distillers grains with solubles. Increasing DPB in the diet increased the concentration of most nutrients linearly (P 0.05) starch (88.3 ± 1.36%), whereas protein supply in the small intestine (78.8 to 91.2 g/kg of DM) increased (P 0.05) among treatments. In conclusion, when diets were formulated to meet or exceed nutrient requirements for targeted performance, changing dietary DPB from − 12 to 14 g/kg had no major effect on animal performance and carcass characteristics.
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