
PROTEIN REQUIRED FOR DAIRY COWS. 159 
are taken into account. But this increase of production may 
be attributed either to the additional protein in the rations,.or 
to the additional grain, or to both. 
‘“Recommended Rations.’’—‘‘ In the winter’s work of 1893-4, 
three herds which had been observed for a period of twelve days 
were fed ona ration suggested by the Station as being better 
than the ones which had been used. ‘The owners gradually 
changed the food to the ration thus proposed, and after an 
interval of four weeks from the close of the first test another 
twelve days’ test was made of the same herd. A comparison 
was thus made of the yields of milk and butter fat with the two 
different rations.’ ~ : 
‘‘ During the winter of 1894-5, four herds were fed a ‘ recom- 
mended’ ration after the observation test, in the same manner 
as the three other herds studied the previous year, except that 
there was only a two weeks’ interval between the two tests of the 
same herd.’’ 3 | 
‘During the fourth winter, 1895-6, two herds were studied 
in a similar way, except that in one case a ration with a much 
larger quantity of protein was used. Nine days elapsed between 
the two tests, and the change from one ration to the other was 
made under the supervision of the person in charge of that 
experiment. In one case, the first ration had a much larger 
amount of protein than we have commonly found on dairy farms 
in this State. In both cases the amount of protein increased | 
in the second ration.”’ 
“Tn the work of the fifth winter, 1896-7, studies of four 
herds were made according to the methods of the two previous 
years. ‘Two weeks were allowed for changing the feeds between 
the tests of the same herd. In the rations fed to one of the 
herds, the nutritive ration in the first test was as narrow as in 
“the standard tentatively suggested by the Station, but in this 
case as in the others the second ration was made still narrower.”’ 
The tests for 1897-8 have not been published. 
“Tn 1899-1900 four herds were studied. .In the second test 
the ration was proposed by the Station, and was determined for 
each herd by the production of butter fat by the cows in the 
herd. ‘The cows were arranged in groups according to the 
average daily amount of butter fat produced by each cow during 
the first test, and all the cows in a group were fed uniformly. 
