PSV-B-20 Effect of Physically Effective Neutral Detergent Fiber, and Undigested Neutral Detergent Fiber on Eating Behavior, Ruminal pH, Ruminal Motility, and Total Tract Permeability for Finishing Cattle

Abstract This study evaluated the effects of physically effective neutral detergent fiber (peNDF), and undigested (uNDF) on dry matter intake (DMI), eating behavior, ruminal fermentation, total tract permeability for finishing cattle. Simmental heifers (n=6; 667.8±28.4 kg) were used in a replicated 3×3 Latin square (21-d periods) balanced carry-over effects. Barley grain-based diets formulated to provide treatments with: low peNDF uNDF (95% barley supplement, 0% straw; 0FOR); but high (85% 10% pelleted PEL); or with chopped ST). Treatment did not affect DMI (P=0.93). Heifers fed 0FOR spent less (P< 0.01) time vs. ST, where PEL was intermediate. Time ruminating greater (P=0.01) ST than 0FOR, differing. had fewer meals/d meal size 0.01). Feeding reduced (P=0.02) mean pH (5.65 6.07) increased (522 288 min/d, P=0.02) duration that < 5.5 relative being intermediate (5.82 504 respectively). (112.5 59.9 sec, P=0.05) between contractions lesser (61.45 94.58 mmHg′sec, contraction area compared cattle while remained (76.73 sec 73.29 mmHg×sec, Permeability gastrointestinal Cr-EDTA intestine Co-EDTA differ (P≥0.11) among treatments. The data suggest increasing improved function, is needed decrease risk acidosis results further use may useful information over NDF inclusion when evaluating adequacy diets.