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Evaluation Of Beef Cattle Range Supplements Containing Urea And Biuret, Ivan G. Rush, R. R. Johnson, Robert Totusek
Evaluation Of Beef Cattle Range Supplements Containing Urea And Biuret, Ivan G. Rush, R. R. Johnson, Robert Totusek
Panhandle Research and Extension Center
Two winter trials were conducted with 304 lactating range cows on dry grass to evaluate non-protein-nitrogen (NPN) in 30% protein supplements containing biuret (pure and feed grade), urea and extruded grain-urea. The NPN sources contributed one-half of the supplemental nitrogen with natural 15 and 30% protein supplements serving as negative and positive controls.
Winter weight loss of cows was greater (P~.02) on the negative than on the positive control in both trials. The apparent utilization of all NPN sources was low and the utilization of urea and extruded grain-urea was less than pure or feed grade biuret. Rumen biuretolytic activity …