68 Animal Husbandry 
pounds) of water one degree C. 
To illustrate the method of cal- 
culating a ration according to the 
energy value of the food, we will 
use the same materials as in the 
Wolff-Lehman illustration. From 
the discussion of energy require- 
ments for the horse, p. 71, we 
learn that the requirement for a 
1000-pound horse at medium work 
Fie. 35.—-Suff..kk mre. is as follows: — 
Kinp oF WorK DicestipLteE Protein, Pounps Eneray VALuse, THERMS 
| 
: — | 
Medium work . 1.4 | 12.40 
By choosing the same trial ration as in the Wolff-Lehman il- 
lustration and using Table 5 of the Appendix for the dry-matter, 
digestible protein and energy value, we get the following : — 
First Trrau Ration ror a 1000-pounp Horse at MEpIuM WorRK 
Foop Dry-Martter | DicEsTIBLE PROTEIN, Pounps |Bweecy y VALUE, THERMS 
eS | 
14 lbs. timothy 12.152 0.287 4.698 
10 lbs. oats . | 8.900 0.836 6.627 
2 lbs. bran . | 1.762 0.204 0.964 
First trial ration 22.814 1.327 12.289 
Requirement | 1.4 12.40 
This trial ration falls considerably below the requirement. 
Now, by adding one pound old-process linseed meal we get the 
following : — 
