15 



THE RATIO OF CASEINE TO FAT. 



There has been some very interesting work clone by Professors 

 Sanborn, Henry and Roberts, which seems to show that a highly ni- 

 trogenous diet, that is, one with a narrow "nutritive ratio," in- 

 creases the proportion of albuminoids to fat in the dressed pig and 

 sheep ; and their conclusions are that the fat may be relativeh' and 

 materially increased b}' starchy food, while the lean ma}' be made 

 relatively more plentiful by the nitrogenous food. Now, as milk is 

 the product of growth in cows, we might reasonably expect to find 

 a similar effect when we feed widely differing rations. 



EFFECT OF NARROW AND WIDE NUTRITIVE RATIO ON RATIO OF CASEINE 



TO FAT. 



A Shorthorn cow, whose milk was analyzed twice daily, was fed 

 on rations varying from a nutritive ratio of 1 :5.5 to 1 :12.9. The 

 periods were of fourteen da}'S each, but were repeated. In the fol- 

 lowing table a number of periods are averaged together and the re- 

 sults stated : 



No. OF PERIODS 

 AVERAGED. 



4 

 4 

 5 

 3 



RATIO OF CASEINE 

 TO FAT. 



1 :1.180 

 1 :1.175 



1:1.098 

 1 :1.14 



ANOTHER SHORTHORN COW. 



2 

 3 

 1 

 1 



1:5.8 

 ] :5.2 

 1:5.1 

 1:5.1 



1 : 1.135 

 1 : 1 . 1 2 

 1 :1.16 

 1 :1.24 



*Cow at pasture — nutritive value estimated. 



A JERSEY COW. 



From table one the following results are taken 



1:5.4 



1 :8.5 



1 :1.28 



1 :1.18 



