E. T. Halnan 1(59 



630-3 kg. live weight at 15-5° C. requires 15,167-5 cals. per day for 

 maintenance, i.e. a 1000 kg. beast requires 24,000 cals. per 24 hours. 

 This figure was obtained by averaging Kiihn's oxen (II, V, VI, and XX) 

 with ox A, ox B not being included for reasons already given above. 

 Calculating this average on the basis of Rubner's surface law, the figure 

 per 1000 lbs. live weight = 12,200 cals. 



Further experiments with three oxen previously fed on a fattening 

 ration led Kellneri to conclude that an 800 kg. animal in a fattening 

 condition required rather more for maintenance per day than an 

 animal of similar weight in store condition, namely 24,900 cals. per 

 1000 kg. per day. The advent of Rubner's surface law, and considera- 

 tion of the fact that the energy calculated from an addition of flesh 

 or fat represented roughly only 60 per cent, of the metabolisable energy 

 of the food digested, caused Kellner^ to recalculate on this basis the 

 maintenance requirements of an ox at rest. From the results thus 

 obtained Kellner constructed the following table: 



Maintenance Eat ion. 

 Observed. Average of experiments : 



Live weight 

 G32 kg. 



Calculated from surface law: 



450 k-g. 



500 



550 



COO 



650 



700 



7.50 



800 



This represented an energy requirement of about 10,840 cals. per 

 day per 1000 lb. ox, i.e. a maintenance starch ecjuivalent of 6-35 lbs. 

 a day. It is this figure that Wood and Yule read off their graph, and 

 it is from this table that Kellner calculated the figures from which 

 Wood and Yule's graph is derived. This estimate is, however, incon- 

 sistent with the figure given in the appendix* to Cloodwin's translation, 

 since the ration there suggested represents an energy requirement of 



I KeUncr, Landw. Versuclis. Stat. 1898, 50, 245. 

 - Kellner, Landw. Versuchs. St^t. 1900, 53, 1^74. 

 ' Kellner, Scientific Feedirig of Animals, p. 392. 



