MAINTENANCE AND PRODUCTIVE VALUES 



291 



Or 28 per cent (44 per cent of 63 per cent) of the original 

 energy value of timothy hay is available for maintaining 

 the animal, and 60 per cent of the energy of corn is thus 

 available. 



When the animal stores up the energy of these feeds, 

 there is a still further loss. The percentages of the diges- 

 tible material that could be stored up were: 



Timothy hay 33 per cent 



Corn meal 53 per cent 



Or 15 per cent of the energy of timothy was available 

 for storing up in the body and 41 per cent of the energy 

 of corn was thus available. 



These results agree with common experience, that 

 timothy hay is fairly good for maintaining a steer, but is 

 very unsatisfactory for fattening. They may be sum- 

 marized as follows: 



VALUES PER 100 POUNDS CONTAINING 15 PER CENT WATER 



270. Comparison of Concentrates and Roughage. It 

 will be seen, in the above comparison, that the losses in 

 each step are much greater for timothy than for corn 

 meal. It will not do to compare the values of these two 



1 A Therm is a thousand large calories. That is the amount of heat 

 necessary to raise the temperature of 1,000 Kilograms of water ^Cen- 

 tigrade. The unit here need not be considered, as only the comparative 

 figures or percentages are important. 



