THE CHEMICAL COMPOSITION OF FARM ANIMALS 29 



things being equal, mature animals usually contain a larger 

 per cent of fat than immature ones. In case of cattle this 

 is clearly shown by Figure 1. 



COMPOSITION OF STEERS 



FROM 100 TO 1200 POUNDS 

 - BODY LESS WASTE BASIS 



100 200 



300 



500 600 



700 



800 900 1000 tlOO 1200 



^ 



FAT 



PROTEIN 



ASH 



WATER 



Fig, 1. — Composition of steers from 100 to 1200 pouncU 

 Experiment Station.) 



(Minnesota 



Protein. — As previously stated, proteinsoccur__as__an 

 essential part of every animal cell, 'and iirih£_-£iiids_sur.r. 



roimding_the_jC£lL They form the chief part of the dry 

 substance of the blood, muscles, nerves, glands, skin, hair, 

 horns, and hoofs of the animal. In amount^ protein usu ally: 

 rRnj^tt npvf fn fgf^ ^Ifhnngh i n j^^ry Jean_Qr hi young animals 



