140 INVESTIGATION IN MILK PRODUCTION. 
a pound of butter fat and total solids; also the nutriment re- 
quirement for the three cows that were far advanced in lac- 
tation. 
TABLE LX.--Giving Average Weekly Weight of 15 Cows. Average Daily Yield 
of Butter Fat and Average Net Nutriment Required to 1 Pound 
of Butter Fat and 1 Pound of Total Solids. 


Average ButterRat Net Nutriment to 1 Ib. 
Lactation Weeks] Weicht Detike 
S » 












Butter Fat | Total Solids 
1st 966 1.083 3 24. 92 
2nd 917 1-369 3.60 1.13 
3rd 900 1.325 4.24 1.35 
4th S77 1.295 4.71 ahafeyae 
5th 873 1.259 5 38 1.63 
6th 863 1.232 6.07 1.72 
7th 865 1.202 6.18 1.75 
Sth 858 1AtS9 6 24 1.81 
9th 853 1.120 6.25 1.89 
1 Cow 29th to 42nd........... 951 1.129 6.12 2.23 
ACowsoStHLO) (ASE lc cccssnen- S27 .800 6.35 2.45 
jaCowmpleLocheroelo2nd we. 896 584 6.21 2.47 



The cows weighed on an average 966 pounds at the be- 
ginning of lactation and 853 the 9th week being an average 
daily loss per cow of 2 pounds. The first week they return- 
ed a pound of butter fat to 3.24 pounds net nutriment, and 
a pound of milk solids to .92 of a pound, and as the cows 
decreased in weight the nutriment required to a given pro- 
duct yielded increased up to the 9th week when a pound of 
butter fat was returned to 6.25 pounds of nutriment, but 
then the nutriment required to a pound of total solids had 
reached only 1.89 pounds, showing that while an equilibrium 
had been reached between the daily nutriment supply and 
butter fat yielded, such was not the case with reference to 
the nutriment required to a pound of milk solids, for as will 
be seen by comparing it with the amount required by the 
three cows, ranging in lactation from the 29th to the 133rd 
week the normal requirement is 2.4 pounds. 
Again referring to Table LI, to show the product re- 
