148 DESCRIPTION OF FEEDING STUFFS 



Plant Industry, Bulletin 124, 1908. " Experiments on the Digestibility of 

 Prickly Pear by Cattle," Hare, U. S. Bureau of Animal Industry, Bulletin 

 106, 1908. " Spineless Prickly Pears," Griffiths, Bureau of Plant Industry, 

 Bulletin 140, 1909.- " Native Cacti as Emergency Forage Plants," Thornber 

 and Vinson, Arizona Bulletin 07, 1911. "The Thornless Prickly Pears," 

 Griffiths, U. S. Farmers' Bulletin 483, 1913. " Behavior under Cultural 

 Conditions of Species of Cacti Known as Opuntia," Griffiths, U. S. Depart- 

 ment of Agriculture Bulletin 31, 1913. 



QUESTIONS 



1. What root crops are commonly used for stock feeding in this country? 



2. Give the characteristic points in favor of the six most important root 



crops. 



3. What is the relative value of roots and silage to the stock farmer? 



4. Name the farm animals to which potatoes may be fed, and method of 



feeding these. 



5. Describe briefly the value for feeding farm stock the following crops: 



Cabbage, rape, pumpkins, and sweet potatoes. 



6. What is the general value of fruits for feeding farm stock? 



7. Name some of the main range and desert plants and discuss briefly their 



value for stock feeding. 



