Vol. 13, No. 7 
Page 3 
Rabbits kept in pens consumed an average of 304 kcal per day for July 7“13, 
and 302 kcal per day for July 13-19, and hence assimilated an estimated 191 kcal 
per day for July 7-13, and l9l kcal per day for July 13-19* (All experimental 
periods began in the afternoon.) Caged rabbits consumed an average of 246 kcal 
per day for July 7-13 and 202 kcal per day for July 13-19, and assimilated 154 
kcal per day and 127 kcal per day, respectively, for the two periods. 
These data show a continuation of the decreasing trend in energy utilization 
by the caged rabbits, which has existed since the study began in February, and 
an apparent decreasing trend by the penned animals, which began in Nay. This 
trend accords with the expected reduction in energy requirements by these animals, 
which require more energy for thermoregulation at winter temperatures than at 
summer temperatures. 
