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: 
pure bison bull 
Quinto Porto 
Fertile hybrid bull pure-bred Hereford bull 
| hybrid cow pure bison bull 
| hybrid cow | 
pure-bred Hereford cow 
Fic. 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 cross-bred animals of superior qualities, not because 
of lack of such superior qualities, but because of the difficulties of secur- 
ing F, 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. 
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