I 



120 



Journal of Agricultural Research 



Vol. XXII. No. 3 



In calculating average results, obtained by both methods, four periods 

 in which there were losses in live weight were omitted. The results for 

 those periods were low, and we were uncertain as to whether the result 

 was approximately correct or whether it was due to an incorrect assump- 

 tion as to the energy value of the loss in weight. Most of the dry matter 

 of the loss was probably fat, and if so, our calculation of its energy value 

 was too low and so made our calculation of the maintenance requirement 

 too low. 



One steer, No. 585, had a navel infection during the first period, 

 accompanied by a very high maintenance requirement. This period also 

 was discarded in calculating averages. 



INFLUENCE OF NUTRITIONAL PLANE 



There is a close parallel between the intake of net energy and the 

 maintenance requirement of the animal. The record of steer 574 illus- 

 trates that tendency. For the first period the average daily intake of 

 net energy was 3.884 therms per 1,000 pounds, based on the 5/8 power 

 of the live weight; and the maintenance requirement was 3.818 therms. 

 For the second period the energy intake was increased to 5.783 therms, 

 and the maintenance requirement increased to 5.1 19 therms. In the 

 third period the energy intake was 5.253 therms, and the maintenance 

 requirement was 4.836 therms. 



Table VI. — Dailymaintenance requirements of cattle — Net energy 



RESPIRATION EXPERIMENTS 



LIVE-WEIGHT EXPERIMENTS 



Armsbv ' . . 



do'. ... 



Haecker * . . 

 Eward ^ . . . 

 Eckles^ .. 

 Shirky 2. . . 

 ... .do. . .. 

 Our results . 

 ....do. ... 

 ....do. ... 



Thin 



do. . . 



Medium... 



do.... 



do.... 



do3.. 



Thin*.... 

 Group I . . . 

 Group II.. 

 Group III. 



7.044 

 6.039 

 5.676 

 7.850 

 7.079 



5- OQ59 

 7.380 

 5- 724 

 5- 217 



6. 136 



4- 713 

 4. 662 

 6.450 

 5.841 



4-953 

 4-915 

 3.809 

 3.276 



50s 

 423 

 021 

 180 

 173 

 732 

 0245 



777 



5 

 5 



4. 869 

 4. 408 



' Armsby, Henry Prentiss, op. cit., p. 291. 



2 Shirkey, S. B. extent to which growth retarded during the early life of the beef animal 

 CAN BE LATER REGAINED. Univ. of Mo. thesis, 1919. (Unpublished ) animal 



' Corresponds to group I of this experiment. 

 * Corresponds to group 11 of this experiment. 



