J. Anim Sci.
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J. Anim Sci. 1973. 37:1010-1017.
© 1973 American Society of Animal Science
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Waxy Corn and Nitrogen Sources for Finishing Lambs and Steers Fed All-Concentrate Rations

W. L. Braman1, E. E. Hatfield, F. N. Owens and J. D. Rincker

University of Illinois at Urbana-Champaign2, Urbana 61801

Abstract

Two metabolism trials with lambs and two feedlot performance trials with yearling steers were conducted to compare waxy with regular corn and soybean meal with soybean meal plus urea in 14.4% protein all-concentrate rations. Nitrogen metabolism of lambs was not influenced by supplemental nitrogen source. Feeding waxy corn increased plasma urea-nitrogen concentration (P < .01), daily gains (P < .01) and feed efficiency (P < .01) and tended to decrease fecal nitrogen (P < .10) and retention of absorbed nitrogen (P < .10), but corn type had no effect upon percent of nitrogen intake retained. There was a corn by supplemental nitrogen source interaction (P < .01) upon urinary nitrogen excretion with urea-nitrogen output being increased when urea was fed with regular corn and lowered when urea was fed with waxy corn. Plasma threonine, valine, isoleucine and leucine were increased and arginine and aspartic acid decreased with the feeding of waxy corn. Plasma lysine increased when urea replaced part of the supplemental soybean meal.

In feeding trials, an interaction (P < .05) between type of corn and source of supplemental nitrogen upon daily gain was observed in one trial. In the second trial, daily gain was improved (P < .05) when steers were fed waxy corn. Steers fed the diets containing the soybean meal supplement gained faster (P < .01) in the second trial. The soybean meal supplemented waxy corn was the superior combination in both trials. Carcass characteristics were not significantly affected by dietary treatment.

Footnotes

1 Present address: Fort Valley State College, Fort Valley, Georgia.

2 Department of Animal Science.






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