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Journal of Animal Science, Vol 71, Issue 5 1326-1334, Copyright © 1993 by American Society of Animal Science

JOURNAL ARTICLE

Comparison of corn and barley with and without ruminal buffer in supplements fed in wheat straw-based diets to beef steers

W. K. Reynolds, C. W. Hunt, T. Moen and J. A. Loesche
Department of Animal and Veterinary Science, University of Idaho, Moscow 83843.

Ruminal fiber digestion is often decreased by supplementation of readily fermentable carbohydrates. Five ruminally cannulated beef steers were used in a 5 x 5 Latin square design to evaluate the effects of grain type (corn vs barley) and ruminal buffer (Na sesquicarbonate; 0 vs 1.2% of dietary DM) on ruminal digestion and fermentation in wheat straw-based diets. Grain supplements were 30% of the dietary DM. The 2 x 2 + 1 factorial arrangement of treatments included a control supplement that consisted primarily of soybean meal. Diets were fed once daily and were formulated to be 10% CP (DM basis). In situ DM (ISDMD) and NDF (ISNDFD) disappearance of wheat straw was measured at 0, 8, 16, 24, 32, 40, and 96 h incubation. To examine the effects of time after supplementation, 8-h incubations were performed at 0 to 8, 4 to 12, 8 to 16, 12 to 20, and 16 to 24 h after supplementation. Corn diets resulted in lower (P < .05) ISDMD for the 12- to 20- and 16- to 24-h periods than did barley diets. Averaged across 8-h intervals, the control treatment had greater ISDMD (P < .01) and ISNDFD (P < .05) than the grain treatments. Treatment differences were not observed for ISDMD and ISNDFD after 8 h of incubation. Ruminal fluid pH for barley diets was greater at 0, 16, and 20 h and less at 4 h after feeding than for corn diets (treatment x hour; P < .01). Propionate concentration was greater (P < .05) for corn than for barley diets.(ABSTRACT TRUNCATED AT 250 WORDS)


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Copyright © 1993 by the American Society of Animal Science.