Principles of Feeding 69 
Seconp TRIAL Ration ror a 1000-Pounp Horst at Mepium Worx 
Foop Dry-Matrter | Dicestisie Protein, Pounps Baie bck 
Ration as above 22.814 1.327 12.289 
1lb. linseed . . 0.908 0.275 0.789 
. 23.722 1.602 13.078 
Requirement. 1.4 12.40 
This ration is slightly too low in dry-matter and too high in 
digestible protein and energy value, but it serves to illustrate the 
method of calculating a ration by the energy method. It also 
serves to indicate the difference between the two methods, as ac- 
cording to the Wolff-Lehman standard the protein is practically 
correct, whereas according to the Armsby standard the protein 
is slightly too high. 
QUESTIONS 
1. How do plants obtain their nutrients? In what respects do corn 
and wheat differ from clover and alfalfa? How does clover and alfalfa 
enrich the soil ? : 
2. Name the more important elements entering into the composition 
of food. Which come from the air and which from the soil ? 
3. Name the elements entering into the composition of protein. Why 
is protein so essential to animal life? 
4. Why is the animal that masticates its food rapidly subject to diges- 
tive disorders? Which should masticate its food more thoroughly, the 
horse or the cow? Of the five classes of farm animals which can con- 
sume the larger quantities of forage and why ? 
5. How long does it require each class of farm animals to digest grain, 
dry forage, and succulent food? 
6. What amount of the total food consumed goes to maintenance? 
What amount to production? Does this vary with the season of the year? 
7. In computing rations which is the more advantageous, the Wolff- 
Lehman or the Armsby standard? Which the more scientific? Which 
