62 
BULLETIN 905, U. S. DEPARTMENTS OF AGRICULTURE. 
for scrub stallions than for scrub males of any other kind of live- 
stock. 
Whether it is advisable for a man who breeds only 1 or 2 mares a 
year to breed always to a stallion of the same pure breed is more 
often questioned. It may seem best to attempt to balance a certain 
defect in a grade Percheron mare by breeding to a Clydesdale stallion. 
The colt is practically a crossbred and should have the vigor of a 
crossbred with at least the general conformation and size of a draft 
horse. There is, however, much more uncertainty in such breeding 
than in consistent grading to a single pure breed. In crossbreeding, 
Fig. 21.— A Percheron stallion. 
Descendant of a long line of impressive ancestors and himself a sire of valuable draft horses. 
one defect on which attention is fixed may be improved, but unex- 
pected ones are likely to appear. In shifting constantly from breed 
to breed there can be no assured progress toward a definite ideal. 
POULTRY. 
The various breeds of standardbred poultry have been selected in 
the past largely according to type and feathers. The heavy breeds 
can be trusted to excel'in meat production, but the situation has not 
