210 MANUAL OF OATTLE-FEEDINa. 



which the work performed per day was the same, while 

 the amount of fodder and its digestibility did not vary 

 essentially during the whole series of experiments. The 

 work performed was measured by a dynamometer con- 

 s|ructed for the purpose, and was as follows : 



Period 1 475,000 kilogramme-metres. * 



'' II 950,000 



"• 111 1,435,000 *' 



" IV 950,000 '' 



" V 475,000 " 



The digestibility of the food was determined directly. 

 The following averages were obtained for the daily excre- 

 tion of nitrogen and the total volume of the urine during 

 the first and second halves and the whole of each period : 





NiTItOGEN IN UeINE. 



Nitrogon 

 of food.t 



Urifib, 



134.41 

 138.33 

 133.73 

 130.40 

 139.41 



YOLUMB OF XJBINE. 



Period. 



Ifit half, 

 arms. 



2(1 half 

 Gims. 



111.0 

 120.5 

 107.7 

 101.9 



Whole 

 Grms, 



99.0 

 109.3 

 110.8 

 110.2 



98.3 



Ist half. 



CO, 



2d half. 



C.C. 



Whole. 



CO. 



I 



II 



III. .... 



IV 



V 



107.0 



113.3 



113.0 



94.7 



* « * • 



6,483 

 7,773 

 9,347 

 9,647 



6,404 

 8,439 

 8,139 

 9,447 



6,730 

 6,473 

 8,100 

 8,080 

 9,548 



These results show that " an increase of the protein con- 

 sumption went hand in hand with the increase of the 

 work ; " but whether the former was a direct result of the 



* A kilogramme-metre is the amount of force required to raise a 

 weight of one kilogramme through the space of one metre, in opposi- 

 tion to gravity, 



fLandw. Jahrbiicher, VIIL, I. Supp., p. 77. 



