=o STORRS AGRICULTURAL EXPERIMENT STATION. 
fattening, there must also be a liberal amount of protein if the 
increase of ‘‘flesh,’’ so-called, is to include any considerable 
amount of lean, though in many cases, and especially with 
some breeds of swine, a large amount of fat can be stored in 
the body from fats and even from carbohydrates in the food. 
For muscular work, the ratio of protein to fuel ingredients may 
vary with the amount and intensity of the work, but it appears 
from the results of the latest and most reliable experimenting 
that for the intenser forms of muscular work considerable pro- 
tein is necessary, although the fats and carbohydrates are the 
chief sources of fuel for the animal machine, and more of them 
is needed in proportion as more of the muscular work is done. 
For the production of milk, the need of a liberal proportion 
of protein in the food is becoming more and more apparent as 
accurate experiments and observations accumulate. Just why so 
much protein is necessary, physiology is not yet able to explain 
clearly and in detail. But it is not easy to see how any 
one can look through the evidence which has accumulated,- 
during the last twenty years, without being impressed by 
the importance which the protein of food plays in milk 
production. In the Reports and Bulletins of this ‘Station 
the need of protein in the feed of milch cows has been con- 
stantly insisted upon. In the previous accounts of the experi- 
ments of the series here discussed this principle has been 
brought out very clearly. In general the best milk production 
has been found where the most protein has been fed, and in 
several instances where the farmers have been feeding rather 
wide rations and afterwards changed to narrower rations by 
increasing the protein, an improvement in the milk production 
was manifest. Naturally there have been some apparent excep- 
tions, as is always to be expected where the periods of obser- 
vation are so short as this. But asa rule liberal rations with 
abundant protein and narrow nutritive ratios and large amounts 
of milk, and milk rich in fat as well as protein, have gone 
together. So true is this that we feel justified in speaking 
even more emphatically than we did at the outset of the value 
of nitrogenous feeding stuffs in the dairy. 
Just what weights of different food constituents are best for 
a given herd or for a given cow on a given farm cannot be told 
with certainty. As we have frequently insisted, it is impos- 
sible to lay down hard and fast rules for feeding. 

