458 



Journal of Agricultural Research 



Vol. Ill, No. 6 



Table VII. — Increments of heat production of cattle in standing — Continued 



Feeding stuff and experiment. 



©R.-ilN MIXTURE No. I ADDED TO TIMO- 

 THY HAY — Continued. 

 Experiment 207 — 



Steer A (period 3) 



Steer A (period i) 



Steer A (period 2) 



Steer A (periods 2-3) 



Steer B (period 3) 



Steer B (period i) 



Steer B (period 2) 



Steer B (periods 2-3) 



Alfalfa hay and gr-un mixture 

 No. 2: 



Experiment 208 — 



Steer E (period i) 



Steer E (period 2) 



Steer E (period 3) 



Steer E (periods 1-3) 



Steer C (period 2) 



Steer C (period 3) 



Experiment 209 — 



Steer F (period i^ 



Steer F (period 2^ 



Steer F (period 3) 



Steer F (periods 1-3) 



Mixed hay axd maize meal: 

 Experiment 211 — • 

 Steer G (period 2J 

 Steer G (period 3I 

 Mixed hay and hominy chop: 

 Experiment 211 — 



Steer D (period 2). 

 Steer D (period 3). 



Average live 

 weight. 



Kilograms. 



5°7 

 499 

 5'^9 



374 

 373 

 .^86 



210 

 206 

 197 



269 

 259 



301 



293 

 283 



358 

 398 



432 

 470 



Dry matter 



eaten per 



head. 



Grains. 



"2,974 

 4>93i 

 7,708 



a 2, 798 

 4,159 



5,451 



3,208 

 1,753 

 1,151 



2,184 

 1,539 



4,502 

 2,756 

 1,648 



2,332 

 7,027 



3,511 

 7.859 



Increment of heat pro- 

 duction per 24 hours. 



Per head. 



Calories. 

 2,293 

 2,704 

 5,lS2 



2,467 

 3,165 

 4,659 



1,944 

 1,682 

 1,718 



2,083 

 2,154 



2,442 

 1,834 

 2, 029 



3,158 

 5,840 



3,533 

 3,905 



Per kilogram 

 of increment 



of dry 

 matter eaten. 



Calories, 



•) 210 



I 892 



610 



1 513 



} I, 158 



828 



180 

 -60 



no 

 -no 



■} - 



348 

 -88 



144 



572 



86 



a Basal ration of coarse fodder only. 



A simple inspection of Table VII suffices to show that the increment of 

 heat production in standing can not be due to any large extent to the 

 muscular work of supporting the body, since, in the light of Zuntz and 

 Hagemann's (52) experiments on the horse, it must be assumed that this 

 would be at least approximately proportional to the weight of the animal, 

 while, in fact, in a large majority of cases the difference between the 

 periods is very much greater than the corresponding difference in Uve 

 weight. Even on the extreme assumption that in the periods on mini- 

 mum rations the heat increment in standing was due exclusively to 

 the increased muscular effort, the differences in live weight do not even 

 remotely account for the greater increments in the other periods. 



