A Study of Growth IJ 



Thus the percentage increment of the females was considerably 

 higher than that of the males. 



In order to determine individual variation within a set, five 

 males and five females from Sets A and B respectively were 

 selected at random. The individual feeding record, together 

 with that of the weights, was kept. The following table shows 

 the initial weight of each individual with its percentage increment 

 during the period of ten weeks. Average amount of beef per 

 week was 315 mg. 



MALES (table XVIIi) FEMALES (xABLES Xix) 



In.wt. Increment In, wt. 



grams per cent grams 



No. (3) 1 .577 38 .9 No. (2) 1 .237 



No. (5) 1.885 28.8 No. (4) 1.387 



No. (4) 2-509 26.8 No. (5) 1-447 



No. (i) 2.627 28.01 No. (i) 1.927 



No. (2) 2.787 20.1 No. (3) 2.222 



From the above table it may be seen that while the percentage 

 increment of several of the individual males is greater than that 

 of some of the females, in general the percentage in the females 

 is greater. The highest percentage recorded for a female for 

 the period often weeks is 64.8 per cent while that of a male was 

 38 .9 per cent. 



Records of individuals taken from the sets kept under high 

 temperatures are not comparable with those given above, because 

 of differences of temperature and feeding; but within the same set 

 males and females may be compared. In Set D^ (Table XXIII) 

 at high temperature (30° C), the individual records of two males 

 and one female were taken. Each animal was fed 105 mg. of 

 beef at each feeding period about thirty times during the ten weeks. 

 The initial weights together with the percentage increments were 

 as follows : 



MALES (table XXIIi) FEMALE (tABLE XXIIi) 



In. wt. Loss In. wt. Increment 



grams per cent grams per cent 



No. (l) i-Oj? 12-5 No. (2) 1-389 2.4 



No. (3) 1.677 25. 



