GROWTH 



389 



From these figures it appears that in the low protein periods 

 the estimated capacity of the animals for growth was fully uti- 

 lized with a surplus of digestible true protein over the maintenance 

 requirement equal to or even less than that actually recovered 

 in the growth, while a much larger supply of protein failed to 

 secure any additional growth but simply forced up the protein 

 katabolism. In other words, if the estimate for the maintenance 

 requirement is approximately correct, the utilization of the 

 digestible protein in the low protein periods must have ap- 

 proached 100 per cent. Indeed, in at least two cases it is neces- 

 sary to admit either that the estimate for maintenance is too 

 high or that non-protein was used for maintenance. 



TABLE 88. COMPUTED UTILIZATION OF PROTEIN BY LAMBS 



1 Substituted for No. II. 



