CHAPTER II 



THE CHEMICAL COMPOSITION OF FARM 

 ANIMALS 



The animal body is the product of the feed which the 

 animal consumes. Thus, having discussed briefly the dif- 

 ferent classes of compounds which are found in feedingstuffs, 

 it is of importance to consider the composition of the animal 

 body which is formed from them. 



Although the chemical analysis of an entire animal is very 

 much more difficult than the analysis of a feedingstuff, still 

 considerable work has been done upon cattle, sheep, and 

 hogs of different ages and degrees of fatness. Lawes and 

 Gilbert, of the Rothamsted (England) Experiment Station,^ 

 carried on the first and most elaborate investigations upon 

 the chemical composition of farm animals. They analyzed a 

 fat calf, a half-fat steer, a fat steer, a fat lamb, a thin sheep, 

 a half-fat sheep, an extra fat sheep, a thin hog, and a fat 

 hog. Jordan, at the Maine Experiment Station,^ analyzed 

 two thin and two fat steers. Trowbridge, at the Missouri 

 Experiment Station,^ analyzed six thin steers. Emmett and 

 Grindley, at the Illinois Experiment Station,'* analyzed two 

 thin pigs and five fat hogs. Haecker,^ at the Minnesota 

 Station, analyzed two new-born calves and forty-five steers 



1 Philosophical Transactions of Royal Society of London, 1859. 



2 Annual Report, 1895. 



3 Proceedings of the American Society for Animal Nutrition, 1910. 

 ^ Unpublished data. 



6 Proceedings of the American Society for Animal Production, 1914, 

 and unpublished data. 



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