l<j<3 Maiiitciiaiur Raliuiis and Starch J'JtjtiiraltJit.s 



obtained to be the dynamic portion only of the food, and, reckoning 

 the fodder as hay, allowed more thermic energy for maintenance 

 than was required. A critical examinatidn of the original data upon 

 which the figures were based shows this. 



Daily requirement of metabolisaljle energy for an ox of | ,.,,,,, ■ i 



632 kg. @ 15-2° C. (average of experiments) ) - '•^•■*'" '^''''*- 



Calculated for a 1(X)0 lbs. animal = 10,840 caU. 



On the assumption that 1 gr. starch yields .'S-TG eals. 1 _.. ..rn 



available for maintenance of the animal body / — 0-.5o lbs. m.s.e. 



On the digestibility figures given by Kellncr for medium ] 



meadow hay (100 lbs. hay =43-5 lbs. maintenance ,= 14o lbs. hay. 

 starch equivalent) J ■~~~~^^~ 



containing 12-4 lbs. dry matter, 



■67 lb. dig. crude protein, 

 •08 lb. dig. crude fat, 

 and 5-3 lbs. dig. N-free extract. 



From the above-mentioned maintenance requirement of 10,840 cals. 

 Kcllner gives 6 lbs. s.e. in his appendix. Calculated as above this 

 would represent 138 lbs. hay. Calculated from starch equivalent 

 assuming it to 1k' production starch equivalent (100 Ihs. liay= 23-7 lbs. 

 p. S.E. and '13-5 lbs. m..s.e.) this would represent 25 lbs. hay containing: 



21 lbs. dry matter, 

 •8 lb. dig. protein, 

 •lb lb. dig. fat, 

 and 0^1 lb. dig. N-free extract. 



'J'lie appendix gives 15-21 lbs. dry matter, •(! to -8 protein, ■ I fat, and 

 7-5 to 9-5 lbs. N-free extract. The error Kelliier committed was therefore 

 the reverse of what Murray assumed. 



The earliest investigations with regard to maintenance rations 

 of oxen at rest were due to Henneberg and Stohmann^ who carried 

 out a series of investigations at Weende Experiment Station on two 

 mature draft oxen, weighing 516 and 575 kg. respectively. These 

 animals were fed on various diets containing two or more of the 

 following foods: oat straw, mangels, rape cake, clover hay and rye 

 straw, and sufficient food was given to maintain the animals without 

 change of body weight. In each experimental period, which varied 

 in length from ten days to two months, a collection of faeces and urine 

 was made during the last three weeks of each experiment, and an 

 analysis was conducted on the excreta produced during the last three 

 days in order to arrive at some idea of the digestibility of the foods 



' Kellner, Landw. Versiicht!. Stat. 53, p. 13. 



- Ilemieberg and Ktohmann, Wolff's Farm Foml.i, p. 220; Henneberg and Stohraann. 

 Bcitrcigc zur Bcyrundiiiirj cincr riilionclloi Fiiltcruiig lUr Wiakrkduir, Pait i. pj). 17-188. 



