J. Anim Sci.
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J. Anim Sci. 1981. 53:1377-1382.
© 1981 American Society of Animal Science
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Ruminal Characteristics as Affected by Monensin, Type of Protein Supplement and Proportions of Whole Wheat and Corn in Forage-free Diets Fed to Fininshing Steers1

R. R. Lyle2, R. R. Johnson3 and W. R. Backus3

The University of Tennessee, Knoxville 37901

Abstract

The effects of monensin, type of protein supplement and dietary proportions of whole wheat and corn on ruminal pH, VFA and ciliate protozoa concentrations were examined in steers fed forage-free diets. In trial 1, four steers were placed in free-standing stalls and used in two successive 4 x 4 Latin square design experiments. Steers were fed whole shelled corn (WSC) diets ad libitum, with and without monensin (300 mg/day), and with either .5 kg/day commercial protein supplement or .5 kg/day soybean meal. Ruminal characteristics were not affected (P<.05) by monensin or protein supplement type. Mean values across all diets for ruminal pH, total VFA concentration (micromoles/milli-liter) and molar proportions of acetate, propionate, butyrate, valerate and isoacids were: 5.99, 127, 45.2, 41.2, 8.4, 4.5 and .5, respectively. Rumens were defaunated by day 19 of the trial. In trials 2 and 3, 47 and 32 steers, respectively, were assigned to four pens and fed ad libitum forage-free diets composed of either WSC or WSC and whole wheat (WW) in various proportions for 50 and 56 days, respectively. Each steer received 300 mg monensin and .5 kg commercial supplement daily during the trials. The level of WW in the diets (0, 20, 40, 60%) did not affect (P<.05) any rumen characteristic measured. In trial 2, 85% of the steers were defaunated by day 50.

Footnotes

1 Supported in part by Domain Industries, New Richmond, Wl, and Tennessee Farmers Cooperative, Lavergne.

2 Present address: Anim. Sci. Dept., Iowa State Univ., Ames 50011.

3 Dept. of Anim. Sci.






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Copyright © 1981 by the American Society of Animal Science.