DISEASE AND RELATED PHENOMENA IN ANIMAL BREEDING 535 



grades are sometimes fertile. The bull Quinto Porto which is shown in 

 Fig. 209 has proven fertile with Hereford cows. His pedigree is as 

 follows: 



Quinto Porto 

 Fertile hybrid bull 



pure bison bull 



. hybrid cow 



pure-bred Hereford bull 



f pure bison bull 



hybrid cow 



( pure-bred Hereford cow 

 FIG. 210. Ancestry of a fertile hybrid cattalo bull. 



By long-continued selection it would be possible apparently to transfer 

 many of the excellent qualities of the bison such as superior coat, greater 

 hardiness, resistance to tick and insect infestation, and superior beef 

 qualities to domestic cattle. There is no possibility of utilizing it like 

 the zebu for securing croos-bred animals of superior qualities, not because 

 of lack of such superior qualities, but because of the difficulties of secur- 

 ing FI hybrids. For range conditions it might be possible to establish 

 a breed of cattalo which would have many advantages. Here again the 

 need of continuous attention and encouragement such as might be given 

 by experiment station supervision would be a valuable aid toward such 

 a goal. 



