74 STORRS AGRICULTURAL EXPERIMENT STATION. 
his work has made some changes in the feeding standards 
to fit them to the later experience of experimenters and feeders. 
In the standard for milch cows, particularly, he has attempted 
to give numerical expression to a fact which has forced itself 
more and more into view, that the ration should be fitted to the 
amount of milk given by the cows. In thus attempting to cal- 
culate rations for different daily milk yields, Dr. Lehmann has 
increased the protein more than the fuel ingredients, that is to 
say, he has made the ration narrower in proportion as the milk 
yield is larger. This is in accordance with the principle above 
referred to, that a cow needs a liberal amount of protein to 
produce a large amount of milk. 
Really, there are two principles which underlie this view of 
the subject. One is that with the improvement of breeds 
during the last twenty-five years or more there has been a great 
increase in the amount of milk produced by cows. The standard 
for milk production of a cow, if we may use the expression, 
has during this time been constantly rising. Supposing the 
need for maintenance of the cow’s body to remain the same, 
the extra material needed for milk production has been, con- 
sequently, increasing, and hence a larger ration ought to be 
assigned for a high-bred milk-producing cow to-day than for 
the cow of twenty-five years ago. The other is that the food 
for the production of milk over and above that for mainte- 
nance needs to be rich in protein. On these two principles 
rests the theory expressed in the large rations with large 
amounts of protein and narrow nutritive ratios for large milk 
production by cows. 
Just as it is useless to lay down hard and fast rules for feeding, 
or exact figures for standard rations, so it is impossible to make 
categorical statements which shall be true in every particular. 
What has just been said, therefore, about liberal rations, and 
about large amounts of protein and narrow nutritive ratios for 
milch cows, is to be taken just as it is meant, namely, as a gen- 
eral statement of a general principle and nothing more. 
THE EXPERIMENTS OF THE WINTER OF 1895-96. 
The cost of the feeding stuffs, the pecuniary results of the 
experiments, the rations fed, and the physiological effects result- 
ing from their use are briefly discussed in the following pages. 

