HEREDITY: MEANING AND INFLUENCE 



25 



shire and the Tamworth breeds of hogs are famous for the 

 large litters farrowed by the sows, while of the lard-type 

 breeds the Duroc-Jersey is prominent in this respect. 



(4) Temperament. As a rule, animals of a heavy, fleshy 

 type are more phlegmatic and less nervous than those of 

 more muscular build. Draft horses, beef cattle, mutton 

 sheep, and lard hogs all show to a certain extent this relation- 

 ship of form to temperament. 



(5) Speed is a striking feature of the horse of light and 

 muscular conformation. A study of the pedigrees of run- 

 ning horses prominent to-day will in many cases show lines 



Figure 6. Holstein Friesian cow Prilly 40082 at 13 years old, on the left, and 

 her three daughters Beauty Pietertje, Cleopatra Gelsches, and Eliza 

 Pietertje, all great producers. Photograph from their owner, H. A. Moyer. 



of descent from the Darley Arabian, with long lists of cele- 

 brated racers in between, covering the period of over a 

 century. In the same way, the record of inherited speed of 

 the American trotter may be traced in a most interesting 

 way from the present back to about 1822, when Bellfo under, 

 the sire of the dam of Hambletonian 10, by many regarded 

 as the most noted speed sire in the history of America, 

 was imported to this country from England. 



