STOCK FOOD 201 



tion of the ground substance by means of ether.* The 

 (thee M evaporated, and the fats and oil are weighed. 

 Tin result is usually called crude fat. 



5. The woody matter is determined in a portion of 

 the ground substance by dissolving out all the other 

 compounds by boiling the sample, first with a solution 

 of an acid, and then with an alkali. The woody matter 

 is then wished, dried, weighed, burned, and the weight 

 of ash subtracted. The result is crude fiber. 



6. The per cent of moisture, crude ash, crude pro- 

 tein, erode fat, and crude fiber are all added together 

 and the sum subtracted from 100. The remainder 

 represents what is called nitrogen-free extract. 

 Nitrogen-free extract is so called because it contains 

 no nitrogen compounds. Jt is made iip principally of 

 stanh. sugar, ami guru, hut [nclndea everything in the 



plant except those substances already determined. 



An analysis made in the manner jii>t described is 

 called a PROXIMATE ANALYSIS oi I feeding Muff. It 



ia railed p r oxim ate because all the oompounds in the 



substance are not determined, hut only these necessary 



to decide its value U a cattle food. The Sum of the 

 nutrient- in a proximate anal\>i> mu>t al\\a\> make 

 100. 



Different cattle foods differ great lv in oompceitionj 

 some contain large amounts of protein, others of fat, 

 and still others of starch. Kven the same food, under 

 different conditions, varies in composition. A great 



•Ether la a liquid much used In medicine to produce Insensibility to 

 pain In operaUona. it dlaaolvea fata and olla very easily, and evaporates 

 very quickly. 



