J. Anim Sci.
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Journal of Animal Science, Vol 72, Issue 3 774-782, Copyright © 1994 by American Society of Animal Science

JOURNAL ARTICLE

Growth efficiency and digestibility of heated protein fed to growing ruminants

T. Nakamura, T. J. Klopfenstein, D. J. Gibb and R. A. Britton
Department of Animal Science, University of Nebraska, Lincoln 68583-0908.

Four trials were conducted to evaluate digestibility and growth efficiency caused by feeding heat-damaged protein. In Trial 1, 60 lambs (18.6 kg) were fed diets containing corn gluten meal (CGM) at five levels either of control (CGM-C) or heat-damaged (CGM-H), along with urea as the main supplemental N source. Efficiency of protein used for growth was determined by the slope-ratio technique. The heat damage to CGM decreased (P < .001) protein efficiency by 46%. In Trial 2, diets with the three highest CGM levels from Trial 1 were fed to 18 of the same lambs in a digestion trial. True N digestibility (TND) was 108% for CGM-C and was decreased (P < .05) 22% by heat damage. In Trial 3, 90 growing cattle (219 kg) were individually fed one of three protein supplements for 56 d. The protein supplement contained either a control source of dried distillers grains (DDG-C) or a heat-damaged source (DDG-H) at five levels, and a urea treatment was used as a negative control. Protein efficiency of DDG protein determined by the slope-ratio technique was decreased (P < .05) 34% by heat damage. In Trial 4, four yearling heifers (265 kg) were used in a 4 x 4 Latin square design to determine N digestibility of three diets used in Trial 3 (plus a diet not reported herein). True N digestibility averaged 98% for DDG-C and was decreased 7% by heat damage. These data suggest that some of the N in heat-damaged protein was absorbed postruminally but was not used for growth by growing ruminants.


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D. H. Kleinschmit, D. J. Schingoethe, K. F. Kalscheur, and A. R. Hippen
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[Abstract] [Full Text] [PDF]


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Copyright © 1994 by the American Society of Animal Science.