326 



ELEMENTS OF AGRICULTURE 



Still, the breed ranks above the other beef breeds in 

 milk-production. The desirability of having hornless 

 cattle led to the development of the Polled Durham 

 breed in the United States. Some of these were secured 

 by collecting and breeding hornless Shorthorns that 



Fio. 165 The beef type. A famous Shorthorn bull 



appeared from time to time as sports. Those that were 

 developed in this way are called "double standard/' 

 because they are eligible to record in both the Shorthorn 

 and the Polled Durham herdbooks. Others were developed 

 by crossing Shorthorns with native polled cattle. These 

 are single standard, not being eligible to record in the Short- 

 horn herdbook. Shorthorn cattle are more variable in 

 color than any other breed. They may be pure red, pure 

 white, mixed red and white, or roan. 



