EFFECTS OF INBREEDING ON BODY WEIGHT 



19 



comprising the seventh to the fifteenth generations, as graphs 

 A, B and C cross and recross each other at various points and run 

 as close together as would any set of graphs constructed from 

 the data for different series of individuals. 



Data for the growth in body weight of the -individuals of the 

 B series, arranged in groups of three generations each, are given 

 in table 9. 



Growth in body weight Albino Ratul 

 Series A Females" 





20 40 60 80 100 120 140 160 180 200 220 240 250 280 300 320 340 360 380 400 420 440 460 480 



Fig. 3 Graphs showing the increase in the weight of the body with age for 

 females belonging to various generation groups of the A series of inbreds (data 

 in table 1 and in table 8: lettering as in figure 2). 



From the average body weights at different ages of the males 

 of the B series of inbreds, as given in table 2 and in table 9, the 

 graphs in figure 4 have been constructed. 



In the B series, from the first weighing until the last, there 

 was a marked difference in the body weights of the males in the 

 four generation groups, since all of the graphs in figure 4 are 

 distinctly separated except at one point (365-day period). 

 Graph A runs higher than any of the other graphs from the be- 

 ginning until the end of its course, thus indicating that in this 

 series of inbreds also the males of the seventh to the ninth gener- 

 ation were heavier animals than the males in the later genera- 

 tion groups. Alales in the first six generations of the B series 



