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Feed Intake and Digestion by Beef Cows Fed Prairie Hay with Different Levels of Soybean Meal and Receiving Postruminal Administration of Antibiotics¹

University of Arkansas, Fayetteville 72701

Abstract

Six cannulated beef cows (one Angus, two Hereford and three Angus x Hereford; 405 kg) were used in a 6 x 6 latin square experiment with a 2 x 3 factorial arrangement of treatments. Prairie hay (.77% N, 73% neutral detergent fiber [NDF] and 7% acid detergent lignin) was fed ad libitum from d 1 through 14 and at 90% of ad libitum intake from d 15 through 21 during digesta collection. Periods lasted 21 d. Soybean meal (SBM) was offered at 0 (control, C), .12 (low, L) or .24% of body weight (high, H; dry matter basis). Cows received daily doses of an antibiotic mixture (1 g neomycin and .125 g bacitracin) or saline in the duodenum. Prairie hay dry matter (DM) intake increased (P < .05) linearly with SBM supplementation, being 25 and 40% greater for L and H than for C, respectively. Ruminal fluid concentrations of NH₃-N and total volatile fatty acids increased (P < .05) linearly as SBM was added to the diet. Ruminal fluid dilution rate increased linearly and particulate passage rate increased (P < .05) quadratically with increasing SBM. True ruminal digestibilities of organic matter, NDF and N increased (P < .10) quadratically with increasing SBM (organic matter; 50.3, 57.9 and 58.3%; NDF: 54.7, 60.4 and 59.8%; N: 17.5, 45.1 and 51.4% for C, L and H, respectively). Main effects of antibiotic administration were not significant. Increases in DM intake when SBM was given were large compared with the small elevations in ruminal digestion, implying that metabolic regulation was modifying intake of low-quality forage.

¹ Published with the approval of the Director of the Arkansas Agric. Exp. Sta.

² Present address: Div. of Anim. and Vet. Sci., West Virginia Univ., Morgantown 26506.

³ Dept. of Anim. Sci.

⁴ Present address: P. O. Box 129, Ogelthorpe, GA 31068.

⁵ Present address: P. O. Box 55, Happy, TX 79042-0055.

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