4 8 



NUTRITION OF FARM ANIMALS 



the total ash of the entire animal and 83.01 per cent of the ash 

 of the carcass was contained in the bones. Of the total nitro- 

 gen of the carcasses of eight of these animals 18.04 P er cent 

 was contained in the bones. Corresponding data for the entire 

 animal are not recorded. 



81. Bone ash. But while the composition of bone itself 

 is quite variable, that of the bone ash is notably constant even in 

 different species. The predominant ingredient is tri-calcic 

 phosphate but it contains, also, calcium carbonate as well as 

 phosphates and carbonates of magnesium and other bases. 

 The average composition given by Zalesky 1 is as follows : 



TABLE 5. COMPOSITION OF BONE ASH OF DIFFERENT SPECIES 



More detailed analyses by Gabriel 2 yielded the following 

 results : 



TABLE 6. COMPOSITION OF BONE ASH 



1 Neumeister; Lehrbuch der Physiologischen Chemie, 1897, p. 456. 

 2 Ztschr. Physiol. Chem., 18 (1894), 257. 



