J. Anim Sci.
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Journal of Animal Science, Vol 73, Issue 6 1595-1601, Copyright © 1995 by American Society of Animal Science

CLINICAL TRIAL

Protein supplementation of ammoniated wheat straw: effect on performance and forage utilization of beef cattle

G. D. Fike, D. D. Simms, R. C. Cochran, E. S. Vanzant, G. L. Kuhl and R. T. Brandt Jr
Department of Animal Sciences and Industry, Kansas State University, Manhattan 66506, USA.

We studied the effects of supplement CP concentration on performance and forage use of cattle allowed ad libitum access to ammoniated wheat straw. During two consecutive winters, crossbred beef cows in late gestation (n = 87 in 1990-1991, n = 84 in 1991-1992) were used in a randomized complete block design with three pens per treatment. Cows were stratified by weight, body condition score (BCS), age, and breed and randomly assigned within strata to 1) control (C, no supplement), or 2 kg/d of 2) low-protein (LP) supplement (12% CP), 3) moderate-protein (MP) supplement (20.1% CP), or 4) high-protein (HP) supplement (31.7% CP) (DM basis). The feeding period was 84 d in 1990-1991 and 60 d in 1991-1992. Supplementation (C vs LP, MP, or HP) increased (P < .01) cow weight gains (32.7 vs 60.7, 62.8, and 72.4 kg, respectively) and improved (P < .01) BCS. Calf birth weights, weaning weights, and ADG were not affected by treatment (P > or = .20). Average calving date, percentage of cows cycling at the start of the breeding season and percentage pregnant after a 60-d breeding season were also similar (P > .20) among treatments. Sixteen ruminally fistulated steers (482 kg, four steers per treatment) were blocked by weight and assigned to the same four supplements in a 30-d digestion trial. Supplementation increased (P < .01) digestible DMI and forage DMI (P < or = .04) and tended (P = .09) to increase digestible NDF intake but did not alter (P > or = .15) apparent DM or NDF digestibility.(ABSTRACT TRUNCATED AT 250 WORDS)


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R. D. Wiedmeier, F. D. Provenza, and E. A. Burritt
Exposure to ammoniated wheat straw as suckling calves improves performance of mature beef cows wintered on ammoniated wheat straw
J Anim Sci, September 1, 2002; 80(9): 2340 - 2348.
[Abstract] [Full Text] [PDF]


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Copyright © 1995 by the American Society of Animal Science.