COMPOSITION OF ANIMALS AND OF FEEDING STUFFS 63 



The earliest investigation of this sort was that of Lawes and 

 Gilbert 1 in 1859, already several times referred to, in which 

 analyses were made of both the carcass and the offal parts of 

 ten animals, viz., a fat calf, a half -fat ox, a moderately fat ox, 

 a fat lamb, a store sheep, a half-fat sheep, a fat sheep, a very 

 fat sheep, a store pig and a fat pig. The determinations made 

 included total dry matter, ash, fat and total nitrogen. Several 

 later investigators have also reported analyses of the entire 

 bodies of animals, including cattle, swine and geese. 



Table 16 contains the results of these various investigations 

 up to 1903 arranged chronologically. In all cases where the 

 data given permit, the results have been computed upon the 

 " empty " weight of the animals, that is, upon the live weight 

 minus the contents of the digestive tract. On account of 

 this recalculation, the figures for Lawes and Gilbert's results 

 differ somewhat from those usually cited. In all cases where 

 nitrogen was determined the " protein " equals N X 6.25. In 

 those cases in which nitrogen was not determined the protein 

 is equivalent to fat- and ash-free dry matter. 



Haecker, 2 as the result of analyses of the bodies of sixty well- 

 fed steers, has reported the following average composition at 

 various weights. 



TABLE 17. COMPOSITION OF STEERS AT VARIOUS STAGES EMPTY 



WEIGHT 



J Phil. Trans., Part II, 1859, p. 493. 



2 Amer. Soc. Animal Produc., Proc., 1914, p. 18. 



