Department of Animal Science
Federal regulations stipulating an increase from 2 to 7 in the number of days during which cattle are not to be fed diethylstilbestrol (DES) prior to slaughter may require changes in procedures followed for marketing finished cattle.
This has raised several questions concerning withdrawal of DES from cattle diets:
What happens to feedlot performance when DES is removed from the diet?
What would be the effects on performance if the withdrawal period was extended much beyond the required 7 days?
What are the advantages of feeding a supplement without DES in comparison to no supplement during the withdrawal period?
To obtain information related to these questions, the effects of DES withdrawal were studied in connection with experiments terminated recently where the cattle had been fed DES for typical periods in the feedlot.
Diethylstilbestrol, DES withdrawal, finishing cattle
South Dakota Experiment Station, South Dakota State University
Embry, L. B.; Davidson, B. E.; and Fox, D. G., "Effects of DES Withdrawal on Feedlot Performance of Cattle" (1972). Research Bulletins of the South Dakota Agricultural Experiment Station (1887-2011). 603.