98 STORRS AGRICULTURAL EXPERIMENT STATION. 
The fat of the food alone is capable of bringing about a one-sided increase in 
the fat content of the milk; it causes a transmission of the body fat to the milk 
without itself going into the milk The greater the fat content of the food the 
larger the proportion of milk fat which is derived from the body fat—that is, 
tallow; and in the same proportion, as a rule, the lower the content of volatile 
fatty acids in the milk fat the higher its melting point.” 
EXPERIMENTS ON THE EFFECTS OF WIDE AND NARROW RA- 
TIONS, OR SMALL VERSUS LARGE PROPORTIONS 
OF NITROGENOUS NUTRIENTS. 
A large amount of experimenting has been carried on by the 
experiment stations of this country for the purpose of studying 
the effect of different rations on the quantity and quality of 
milk, and upon the financial results obtained from the use of 
different feeding stuffs. An effort is here made by one of the 
writers (C. S. P.), to summarize such of these experiments as 
have been made with widely varying quantities of protein 
(narrow and wide rations) where sufficient data are given to 
make it practicable to estimate the rations, and to study their 
. effect on the quantity and composition of the milk. Several 
of these experiments were conducted for the express purpose 
of studying the effects of wide and narrow rations, and all of 
the conditions other than the one being studied seem to have 
been carefully controlled and made as uniform as possible 
throughout the experiment. In other cases the object in view 
has been simply to study the relative profit from the use of 
feeding stuffs varying widely in composition. In some cases 
analyses of the feeding stuffs were not made, while in the 
majority of cases the digestibility of the ration was calculated 
-from average digestion coefficients. A considerable number of 
such experiments are summarized in table 13, on pages 102, 103. 
Only experiments showing widely varying quantities of pro- 
tein in the rations have been tabulated. In most cases the 
quantity of digestible protein fed daily in the narrow ration 
was about twice that which was fed in the wide ration. 
Lixperiments at the Lowa Experiment Station.**—Perhaps the 
most notable instance of the apparent effect of food on the 
quality of the milk, in the experiments tabulated, is that 
brought out by those made at the Iowa Station. The results 
are summarized by the writers of the Bulletin as follows: 

* Bulletin 14, August, r8or. 

