Net Energy Evaluations of Beef Cattle Rations with and without Stilbestrol

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Abstract
Protein utilization and metabolizable energy evaluations of three beef cattle finishing rations with and without stilbestrol additions resulted in a beneficial stilbestrol response upon protein utilization and essentially no metabolizable energy response (Adeyanju, Fowler and Burroughs, 1969). Since metabolizable energy measurements only partially evaluate ration energy utilization and since stilbestrol is known to materially lessen feed requirements per unit of gain (Burroughs et al., 1955), it seemed desirable to make more extensive measurements before concluding that stilbestrol has no influence upon ration energy utilization. Our study attempted to make more precise energy measurements by adapting the California feedlot slaughter technique (Lofgreen and Garrett, 1968a) whereby net energy measurements for different body functions could be made simultaneously on a series of rations fed ad libitum to beef cattle in a feedlot experiment especially designed for statistical interpretation. The procedure consisted of group feeding 12 pens of cattle six finishing rations at two levels of feed intake. Copyright © 1970. American Society of Animal Science . Copyright 1970 by American Society of Animal Science

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