48 AGRICULTURAL EXPERIMENT STATION. [Jan. 



Per Cent, of Fat in Milk on a Basis of Fourteen Per Gent. Solids. 



Wide ration, .... 

 Narrow ration, 



Percentage increase of narrow 

 over wide ration, 



1.18 

 2.09 



4.43 



4.68 



5.64 



4.45 



4.77 



7.19 



4.43 

 4.72 



6.54 



4.43 

 4.73 



6.50 



This experiment would indicate that the increase of protein 

 in the food had somewhat increased the per cent, of fat in 

 the milk. 



The experimenter draws the following conclusion: '*In 

 general, the milk was richer while the cows were fed the 

 ration rich in protein, though with one cow it showed the 

 largest per cent, of solids during the third period, while she 

 was eating the corn-meal ration. 



" In general, the proportion of fat increased throughout the 

 experiment, without regard to what the cows were fed, and 

 no evidence is furnished in support of the notion that by 

 changing the food it is possible to produce more butter fat 

 without an accompanying increased production of other milk 

 solids." 



Armsby * carried out similar experiments with three cows 

 during the years 1885 and 1886. The digestible protein fed 

 during 1885 was from 1.5 to 2 pounds daily and the total 

 digestible organic nutrients 13.5 pounds daily to cows of about 

 850 pounds live weight. These rations were sufficient in 

 quantity. During 1886 1.1 to 1.8 pounds digestible protein 

 and 12.7 pounds of total organic nutrients were fed. The 

 weight of the animals is not given, but probably they were 

 about the same as in the previous experiment. Armsby 



* Wisconsin Experiment Station, reports for 1885 and 1886. 



