Graduate Thesis Or Dissertation
 

The effect of varying levels of readily available carbohydrates on urea utilization

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  • The object of this research was to study the effect of readily available carbohydrates (RAC) upon the utilization of urea in fattening rations and to determine the effect upon carcass characteristics that determine quality and yield grades. A 2 x 2 latin square designed feedlot trial comparing urea at 0.5% and 1.5% and molasses at 2.5% and 7.5% of the ration resulted in a significant interaction (p < .01) for rumen ammonia, acetic, valeric, and isovaleric acids, total VFA, and butyric acid (p < .05) concentrations. Urea and molasses additions significantly (p < .01) increased acetic and propionic acid levels but molasses decreased (p < .05) the molar % of acetic acid. Carcass characteristics were not affected by the urea or molasses treatments. Individual VFA concentrations had a low correlation to carcass characteristics, accounting for less than 20% of the total variability. In a standard metabolism trial comparing fattening rations containing 0% or 1.5% urea and varying levels of RAC from 42% to 53%, the apparent digestibility of the feed components was not significantly (p > .1) affected by substituting 1.5% urea for natural protein. The percent of absorbed N retained increased 0.90% for each 1% increase in RAC, yielding a regression equation, y = 64.98 + 0.8134 (X-47). The percent N retained increased 0.82% for each 1% increase in RAC and can be expressed by the regression equation, Y = 46.82 + . 7471 (X-47). This would suggest as the RAC level of the ration increased urea is more efficiently incorporated into protein.
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