This is the fifth experiment in this series conducted to determine the
value of added trace minerals in a typical cattle-fattening ration. The
four previous experiments are reported in Kansas Agricultural Experiment
Station Circulars 279, 308, 335, and 358. No response has been
obtained when trace minerals were added to high roughage rations of
sorghum silage, sorghum grain and a protein concentrate, or to a fattening ration or sorghum grain, prairie hay, and a protein concentrate.
Improved performance has been obtained when trace minerals were added to fattening rations of corn, prairie hay, and a protein concentrate.
Ground limestone has been fed in all the fattening trials to furnish
adequate calcium.
