168 Western Live-stock Management 
extremely rigid. The Corriedale is very similar to the 
Lincoln-Merino cross which is so common on our ranges, 
with the addition that they breed reasonably true. Pure- 
bred Corriedale ewes are out of the question for range 
purposes, but if cross-bred ewes are carefully selected 
and mated to good Corriedale rams, the offspring will be 
as profitable as the ordinary half-bred and much of the 
same type. By moderate but careful culling and the 
continued use of Corriedale rams, the type of the ewe 
flock should become well established in a few years. This 
system has not been tried on an extensive scale in this 
country, but it has proven very successful in New Zea- 
land. The great difficulty is in securing Corriedale rams. 
Being a comparatively new breed, rams are not numerous, 
and those available require close culling. 
THE PANAMA 
The Panama breed of sheep was developed in America 
from a cross-bred origin somewhat the same as the Corrie- 
dale. The type of this breed is not well fixed as yet, but 
with years of breeding, involving careful selection and cull- 
ing, it will undoubtedly be a factor in western sheep- 
breeding. 
SYSTEMATIC CROSS-BREEDING 
In view of the relative scarcity of sheep of these new 
breeds that possess the type really desired by the range- 
men, it seems necessary to continue some form of cross- 
breeding. Although cross-breeding always has its faults 
and its difficulties, it has been demonstrated that there 
are better methods than the indiscriminate mixing 
commonly followed on the range. The best system of 
cross-breeding vet devised is illustrated by the diagram 
