54 



NUTRITION OF FARM ANIMALS 



removed as fully as possible by prolonged extraction with 

 ether. The residual fat which cannot be removed in this way 

 was determined by Dornmeyer's digestion method and a cor- 

 responding correction made in the analytical results. The fol- 

 lowing are his averages for the fat- and ash-free substance: 



TABLE 10. COMPOSITION or FAT- AND ASH-FREE LEAN MEAT 



All the samples were tested for glycogen, but only traces 

 were found, except in the horseflesh, for the two samples of 

 which an average of 3.65 per cent was obtained, a result which 

 accounts for the low figure for nitrogen. 



The tissues of alimentation 



89. Definition. Under this heading may be grouped the 

 organs and tissues directly concerned with supplying food to 

 the organism, with its distribution through the body, and with 

 the removal of waste products of cell activity. That is, it in- 

 cludes the organs of digestion, resorption, circulation, respira- 

 tion and excretion, which constitute what are ordinarily spoken 

 of as the entrails of slaughtered animals. So far as most of the 

 familiar internal organs of the animal are concerned they may 

 be considered as made up to a large extent of the classes of tis- 

 sues already considered. In addition, however, the internal 

 organs include a somewhat distinct type of tissue, viz., glandu- 

 lar tissue, which plays an especially important part in the di- 

 gestive processes, while it is also of the highest significance for 

 other bodily functions. 



