CHAPTER XXV. 



STATION TESTS WITH FEEDING STUFFS FOE DAIET COWS. 



I. Concentrated Feeds. 



633. Whole corn compared with corn and cob meal. — In a feed- 

 ing trial with seven cows at the Ohio Station, ^ corn and cob meal 

 fed with hay was compared with ear corn. The average yield 



per cow during a fourteen-day period was: 



Daily milk Per cent, fat 



yield. in milk. 



When fed com and cob meal 16.2 pounds. 3.57 



When fed whole ear com 15.7 pounds. 3.76 



It will be seen that during the corn and cob meal period the 

 yield of milk was one-half pound more daily for each cow. This 

 has little significance, however, when it is remembered that the 

 period of lactation was advanced two weeks during the second 

 trial. (158, 382, 539) 



634. Waste in feeding whole ear corn. — At the Wisconsin Sta- 

 tion, WoU, 2 observing unbroken grains of corn in the excrement 

 of cows fed dry ear corn and also those getting ear com in silage, 

 ascertained the amount of grain passed by the cows during twenty- 

 four hours. The droppings were washed and the grains of corn 

 collected. The figures in the table give the weight of the corn 

 calculated to the same water content as when fed: 



Amount of cornfoimd in excrement of cows — Wisconsin Station. 



Weight of corn as fed, pounds 



Weight of droijpings for twenty-four hours, 



pounds 



Undigested kernels of com, quarts 



Weight of kernels, pounds 



Per cent, of corn appearing in droppings , 



' Kept. 1883. ' Kept. 1892. 



