A previous test using sorghum silage (Kans. Agri. Expt.
Sta. Bull. 507:5, 1967) indicated that 3 pounds of grain per
day in silage would supply enough available energy for reasonably
good utilization of nonprotein nitrogen (urea). However,
additional grain apparently increased the utilization
of urea. This is the second test to obtain information on
the minimum amount of readily available energy as grain
necessary for efficient utilization of nonprotein nitrogen
as a substitute for natural protein. During the wintering
phase, the roughage was corn silage with an average of
38.5% dry matter. Grain made up 27% of the dry matter.
Prairie hay replaced the silage in the finishing phase.
Supplemental treatments are shown in the tables giving
the results.
