Milk Response from Feeding Diethylstilbestrol to Identical-Twin Cows during Complete Lactations

Effects on milk production of feeding low levels of diethylstilbestrol (DES) to five pairs of identical-twin cows were studied. Each cow fed DES produced more 4% FCM than the control, but in one pair the difference was not significant at the 5% level. Except in one pair, cows fed DES gained less weight than the controls and were about 6% more efficient producers of 4% ~C~I. Editor.