pure-bred steer was notably superior to the scrub as regards the 

 energy content of a unit of gain. 



That a unit of gain by the pure-bred steer represented the stor- 

 age of more energy than an equal gain by the scrub steer appears 

 to be due largely to the greater proportion of protein with its large 

 amount of accompanying water which seems to have characterized 



Pure- Bred Steer Feb. 20, 1907. 



Scrub Steer Feb. 20, 1907. 



the gain made by the latter. Both the composition of the gain ob- 

 served in the respiration calorimeter experiments and the results of 

 the nitrogen balance trials show that the scrub steer had a notably 

 greater tendency than the pure-bred steer to gain protein, while 

 the pure-bred, on the other hand, was inclined to store up more fat. 

 This result was confirmed also by chemical analyses of corre- 

 sponding parts of the carcasses of the animals at the close of the 



experiments. 



Conclusions. 



Our general conclusion from the foregoing data, then, is that 

 the two steers did not materially differ as regards digestive power, 

 percentage of feed energy metabolized or percentage availability 

 of the feed energy. The pure-bred steer was superior to the scrub 



18) 



