FIRST CENTURY OF DAIRYING IN NEW SOUTH WALES. 



Fats. This group embraces the materials which may be dissolved 

 Irom the foodstinfs by ether. Carbo-hydrates also supply lats under 

 the heading of nitrogen free extract. Hence, since the carbo hydrate.-, 

 and iat serve nearly the same purpose in the animal economy, they 

 may, for convenience, be grouped together. 



Nitrogenous Matter. This is the protein of foods. The term al- 

 buminoids is sometimes used to designate this group. Its function is 

 to supply the waste of the animal body. On the other hand, the woru 

 pn'tein is used. Since then, therefore, the protein on the one hand 

 and the carbo-hydrates and fat on the other, serve, in the main, to 

 lulril the different purposes in the animal economy, it becomes evident 

 that the relative amounts of these nutrients in the food are important. 

 This relation is expressed as the '' nutritive ratio," which means the 

 relation of digestible protein to digestible carbo-hydrates and fat. The 

 nutritive ratio is found by dividing the carbo-hydrates, plus 2! time* 

 the, fat, by the protein. By following out these hints to their logical 

 conclusion, and then by carefully comparing the analysis given by 

 chemists of the amount of digestive substances contained in foodstutt.-, 

 .something definite can be arrived at. 



Professor Brown, who has gone to much trouble to ascertain facts 

 about cow foods, gives a table of feeding values of certain stuffs in 

 use for milch cows in Australia : 



The relation .if f. ...! t o but U-r-fat has been one of the most debated 

 questions connected with the dairy cow and her management. It has 



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