no 



Analysis of Feeding Materials [169, 170 



Moisture ...... 



Soluble albuminoids .... 



Insoluble albuminoids .... 



Digestible fibre ..... 



Woody fibre ..... 



Soluble ash ..... 



Insoluble ash ..... 



♦Chlorophyll amides, &c. (by difference) 



♦Containing nitrogen .... 

 Total nitrogen ..... 



SILAGE 



169. The analysis of this substance is conducted in much the 

 same way as that of hay and grass, using the same quantities of 

 substance as for grass. The only difference is that the acidity 

 is estimated in addition to the constituents given above. 



This is done in the 40 grams weighed out for the estimation 

 of crude fibre. 



170. Acidity. — The liquids from the first three soakings (see 



paragraph 160) are collected and made up to a litre with distilled 



water. Five hundred c.c. are taken, and the total acidity deter- 



N 

 mined with KHO. It is a matter of some difficulty to de- 

 10 



tect the exact point of neutrality owing to the greenish colour of 

 the solution. A dozen drops of phenol-phthalein are placed with 

 a stirring rod on different parts of a glass plate. The alkali is 

 run into the liquid, a few drops at a time. After each addition 

 it is stirred vigorously, and tested by touching one of the drops 

 on the plate with a drop of the liquid on the end of the rod. 

 When the indicator gives a faint pink reaction the quantity of 

 potash added must be read off. 



The remaining 500 c.c. are boiled down in a beaker over a 



