144 INVESTIGATION IN MILK PRODUCTION. 
It is not expected that by making any one product the 
basis of calculation the exact results from decrease in weight 
of body can be shown, because dairy products have not a 
common energy value, and because all the solids yielded in 
milk are derived either from the nutriment consumed or from 
the substances stored in the body, but it would seem to be 
more in accord with thenatural order of things that nearly all 
the milk solids are the direct product of the nutriment then 
taken, and the maintenance and energy expended are charge- 
able at least in part to oxidation of body tissue. 
Making similar calculations from the records of thecows 
Klondike, Duchess and Leeoma, that were made from the 
records of Trust and Pride, it can be approximately de- 
termined what the nutriment requirements are where no 
material change in weight of body takes places. 
TABLE LXIII.—Showing Total Nutriment Daily, Nutriment Available for Product 
and Nutriment Required to a Pound of Total Product Yielded. 









Nutriment Daily for Lbs. of Net 
Total > Total Nutriment to 
Nutriment Product 
DES SUCRE: Product Daily s eee: 
nance 
Klondike ecnccsacteccedsaness a Haya Wg US} 7.418 7.695 4.788 1.60 
Da ChHESS'a..ccc.cscc.seseasneseees Lal G2 6.451 ayar(a let Seo 1.74 
WWCCOMMA= cress ccevisces couseeasess ala Ysa lis} 6.989 4.189 2.343 1.78 
A Ocal scckexaccsecsesocssecs 38.453 20.858 17.595 10 404 
ASVELAIL Cincvecncccencnsere 12.818 6.953 5.865 3.468 1.69 




From this it is seen that it required from 1.60 to 1.78 
pounds of nutriment to 1 pound of product. Byreferring to 
table LIX it will be seen that the cow Klondike was really 
loosing weight at the rate of about a quarter of a pounda 
day, and this had a noticeable influence on the nutriment 
she used to a pound of product. Her system had the alter- 
native of using the full complement of nutriment required for 
maintenance and shrink in yield of dairy product, or main- 
tain the yield and shrink in body weight, but it chose to give 
full return in dairy product and draw on body tissue to 
make good the shortage in the nutriment supply, showing 
how wonderfully responsive the dairy bred cow is to the de- 
mands of her lacteal functions. 
The record of the cow Duchess gives a furtherillustration 
of the influence of change in body weight upon the return of 
