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Journal of Animal Science, Vol 73, Issue 7 1888-1900, Copyright © 1995 by American Society of Animal Science

JOURNAL ARTICLE

Influence of roughage and grain processing in high-concentrate diets on the performance of long-fed Holstein steers

M. J. Traxler, D. G. Fox, T. C. Perry, R. L. Dickerson and D. L. Williams
Department of Animal Science, Cornell University, Ithaca, NY 14853, USA.

The effects of roughage source and timing of inclusion in high-concentrate diets on feedlot performance were evaluated in each of 2 yr with 144 and 120 long-fed Holstein steers, respectively. Roughage, when included in the diet, was delivered in a built-in-roughage (BIR) pellet supplying 15 and 6% roughage (percentage of DM) or hay crop silage (HCS) supplying 7 and 10% roughage (percentage of DM) for the growing and finishing periods, respectively. The six dietary treatments (two pens each) investigated were continuous whole corn and pelleted supplement (no added roughage; WSC-PEL); BIR with cracked corn either in the growing (BIR-G) or finishing (BIR-F) period with whole corn being fed with pelleted supplement when BIR was not part of the diet; BIR and cracked corn fed continuously (BIR-CONT); and two HCS treatments in which the corn was fed either whole (HCS-WSC) or cracked (HCS-CSC) for the entire feeding period. Replicates were slaughtered 4 and 3 wk apart for yr 1 and 2, respectively. Pooled daily gains (yr 1 and 2) for the entire trial (1.39 to 1.45 kg/d) were not different (P > .05). Daily DM and concentrate intakes were lower (P < .001) and gain efficiency was higher (P < .001) for the WSC-PEL than for the other treatments. Carcass characteristics were similar among treatments except for an improved yield grade (P < .02) for the HCS treatments over the BIR treatments. The WSC-PEL treatment was the most profitable (+/steer) and the BIR-CONT diet was the least profitable. The HCS treatments were the most profitable of the roughage treatments. A newly proposed intake prediction equation for feedlot cattle performed similarly to the 1984 NRC equation with long-fed Holstein steer calves.


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D. J. Gibb, F. N. Owens, P. S. Mir, Z. Mir, M. Ivan, and T. A. McAllister
Value of sunflower seed in finishing diets of feedlot cattle
J Anim Sci, September 1, 2004; 82(9): 2679 - 2692.
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Copyright © 1995 by the American Society of Animal Science.