INFLUENCE OF STAGE OF LACTATION. 145 
dairy products to food consumed. In her case, as may be 
seen by referring to table LIX, the slight daily loss of less 
than .1 of a pound in weight is reflected in the amount of 
nutriment required to a pound of product. There was 
doubtless a waste of nutriment during the 59th and 70th 
weeks of lactation because of the sudden increase in the 
rations fed during the two weeks. This is indicated by the 
fact that she stands charged in the table referred to, with 
6.35 pounds of nutriment to 1 pound of butter fat yielded, 
while Leeoma required only 6.21. 
Taking into account the changes in the weight of the 
cows referred to, it is quite evident that it requires about 
1.75 pounds of available nutriment to produce 1 pound of 
product; that is, of the available nutriment, 43 per cent is 
en in energy and 57 per cent is returned in the milk 
solids. 
Of the total nutriment consumed daily approximately 
54 per cent was required for maintenance, 19 per cent for 
energy and 27 per cent was returned in the milk solids. 
Again taking the record of Trust during the first ten 
weeks of her period of lactation, showing the decrease in 
weight from week to week, the average daily nutriment 
available for product each week, the butter fat yielded, the 
normal daily yield, and average daily yield in excess, the 
compensatory yield by virtue of a daily loss in weight of 2 
pounds is shown. 
TABLE LXIV.—Showing Decrease in Weight of Trust, Daily Average of Net 
Nutriment, Yield of Butter Fat, Normal Yield and Excess. 






Net Butter Daily | Daily 
Week Weight Nutriment Fat Normal Yield| Excess Yield 
Daily Daily Butter Fat | Butter Fat 
1st 925 3 811 1.452 .609 843 
2nd 875 6.388 1.817 1.022 | “ao 
3rd 825 5.327 1.750 S520 898 
4th 802 §.526 1.708 884 | 824 
5th 797 5.957 1.558 953 605 
6th 795 6.355 1.573 1.017 556 
7th 785 1.722 1.544 1.235 .309 
8th 785 1.722 1.531 1.235 296 
9th 795 8.136 1.487 1.302 .185 
10th 785 8.214 1.610 1.314 296 
Average... 6.516 1.603 1.042 561 




