510 



IOWA ACADEMY OF SCIENCE Vol. XXV. 1918 



TABLE IV, Continued. 



It can be seen that the experimental animals grew fairly well 

 until they were al^oiit three months of age but from this time on 

 they did not thrive. They continued to gain slowly in weight 

 for another thirty days after which their live weights decreased 

 gradually until the time of death. The body measurements ap- 

 peared to increase about normally until the time the live weight 

 increase ceased to be rapid and from this time on the measure- 

 ments changed very slightly — in fact they were almost constant. 

 A greater increase in height than is shown by the figures prob- 

 ably did occur but owing to the fact that the animals began to 

 go down on their pasterns about the time the live weight ceased 

 to increase, the true height could not be measured. 



The increases in live weight and body measurements can be 

 more easily appreciated when they are shown as percentages of 

 the original figures. The increases in live weight from birth, to 

 the time of death in the case of the experimental animals, and 

 to the a^e of six months in the case of the herd average, are 

 expressed as percentages of the birth weights while the body 

 m.easurements are compared in the same way from the time the 

 animals were thirty days old. 



TABLE V. 



PERCENTAGE INCREASE IN LIVE WlJIGHT AND BODY 

 MEASUREMENTS. 



During t:)cir lifetimes the exj)erimental animals practically 

 doubled their live weights while during similar len;;ths of thv(i 



