1084 



EXPERIMENT STATION RECORD. 



The rations were varied at different times so as to furnish different 

 amounts of air-dry food material and different amounts of protein, 

 the decrease in protein being accompanied by an increase of* carbo- 

 hydrates. 



The full data for the experiment are tabulated showing the composi- 

 tion of normal and extracted foods; the amount of food eaten; the 

 composition of the milk, urine, feces, etc., and from these data the 

 amounts of nitrogen aud of fat consumed and extracted are calcu- 

 lated. Incidentally some data are given as to the comparative results 

 of extraction of fat with sulphuric and petroleum ethers and the effect 

 of drying upon the nitrogen content of cows' feces. The results as to 

 the income and outgo of nitrogen and fat are summarized in the 



following tables: 



Income and outgo of nitrogen. 



Nitrogen balance. 



Normal food.s 



Same foods extracted 



E xtracted foods w i th 

 more nitrogen 



Transition period 



Extracted foods with less 

 nitrogen 



Extracted foods, mini- 

 mum ration 



Transition period 



Extracted foods, same as 

 in period 2 



Totals on extracted 

 food 



Income. 



Days I 



in {ie- ! Total Nitr<>- 



riod. nitrogen I gen di- 



in food, i gested. 



Grains. 

 1, 307. 6 

 1, 546. 4 



1,552.4 

 920.2 



1, 158. 4 



1, 905. 9 

 373.2 



8 1, 563. 3 



59 9, 019. 8 



Grams. 



862. 5 

 823. 5 



942.2 



501.3 



523.8 



590.3 

 206.0 



4, 504. 1 



Outgo. 



Nitro- 

 gen in 

 milk. 



drams. 

 325.4 

 360.9 



302. 1 

 208.6 



284.6 



644.3 

 93. 4 



Nitro- 

 gen in 

 urine. 



<;>■<( ins. 

 523.3 

 430.1 



416.0 

 255.1 



267.5 



583.1 



Nitro- 

 gen in 

 feces 



Total 

 outgo of 

 nitro- 

 gen. 



Grams. Grams. 

 445. 1 1, 293. 8 



2,191.8 2,417.5 



722. 'J 



610.2 

 418.9 



634.6 



1,315.6 

 167.2 



646.3 



1,573.9 



1, 348. 3 

 882.6 



1, 186. 7 



2, 543. 

 349.5 



1,301.0 



9, 125. 



Daily 

 gain 

 ( + ) or 

 loss (— ) 

 of ni- 

 trogen. 



Grams. 

 + 2.0 

 + 4.1 



+ 29.2 



+ 7.8 



— 3.5 



—31.8 

 + 7.9 



+32.8 



Income and outgo of fat. 



'The urine contains no fat. 



