48 CIRCULAR 925, U. S. DEPARTMENT OF AGRICULTURE 
MODERATE 
ome == HEAVY 
OCT. NOV. DEC. JAN. FEB. MAR. APR. 
1937-38 
CHANGE IN WEIGHT (POUNDS) 
OCT. NOV. DEC. JAN. FEB. MAR. APR. 
1938-39 
Figure 22.—Changes in weight of 119 ewes in herds A and B, which were wintered 
alternately on moderately and heavily grazed ranges for the grazing seasons of 
1937-38 and 1938-39. 
During the first part of the winter period both herds showed about 
equal weight trends. Apparently there was sufficient forage for the 
flock on the heavily grazed range until sometime in January. Then 
the two herds began to show differences in body weight. Since the 
ewes were bred during December, fetal development undoubtedly in- 
fluenced the body weight of ewes throughout the winter. During the 
midwinter period ewes on moderately grazed range gained in body 
weight. In contrast, the ewes on heavily grazed range continued to 
lose weight until sometime in March. The differences in body weight 
on the moderately and the heavily grazed range were similar in most 
years of the study. 
