CHAPTER II 

 FEEDING STUFFS AND THEIR PREPARATION 



How Feeding Stuffs are Analyzed. — In analyzing feed- 

 ing stuffs the chemist determines the percentage of the 

 following substances : water, ash, protein, fat, crude 

 fiber, and nitrogen free extract. All of these are capable 

 of furnishing nourishment to the animal body, hence they 

 are called nutrients. 



To determine the amounts of water and ash the chemist 

 first takes a known weight of the feeding stuff, dries it at a 



WATEE 



PEOTIIN' 



MINEEAI OTHER 



5UBSTAI-ICE SUBSTAWCES 



Fig- 5. — Composition of feeding stuffs. 



temperature of 212° F. for a few hours, reweighs and repeats 

 the drying process. When it finallj' comes to a constant 

 weight the difference between the original and the dry 

 weight is the amount of water driven off. Dividing the 

 weight of water by the weight of the original sample 



