66 UNIVERSITY OF WISCONSIN STUDIES 
ficient sugar is not oxidized in the cells the sugar hungry 
cells attract fat. Dextrose is converted into milk sugar in 
the mammary gland and cannot then be burned in the or- 
ganism; the mammary c¢cll becoming a sugar hungry cell 
attracts large amounts of fat which is present in the blood. 
TABLE IV 
EFFECL OF UNDERFEEDING—ADVANCED LACTATION 
Jersey Cow No, 2 
Date Per cent Pounds Live Energy Energy 
of fat of milk weight supplied required 
'Therms Therms: 
APTA yore essa necaie < 4.8 11.9 870 15.76 9.69 
Died cicesoavennise 4.4 11.3 &70 15.76 9.47 
Oe 4.5 10.9 870 13,53 9.32 
DOngatite@ anes 5.8 11.1 865 10.58 9.36 
eM ye eerie se aie 5.4 10.6 842 9.07 9.05 
Dia rotate 5.5 10.7 840 &.32 9.07 
DR cispeadinettes deo 5.4 10.8 855 9.47 9.20 
ON Se as Bieta 5.0 10.9 860 11.27 9.26 
Uda alas ces sae 4.7 10.7 852 11.98 9.14 
Mays Disccasgs nd tti fs 5.0 13.5 852 15.78 9.79 
D Sati siatsactate sa 5.2 Tel 850 15.75 9.27 
The author in connection with Dr. L. 8. Palmer has given 
some attention to the question of the cause of this increase in 
fat content which accompanies underfceding. <A. series 
of expcriments was conducted to test a theory that the in- 
crease in the fat in the milk is due to an inercase in the fat 
in the blood of the animal during underfeeding, a condition 
known to occur with smaller animals, at least, under condi- 
tions of starvation. 
Two cows, a Shorthorn and an Ayrshire, were selected for 
the test. These animals were fattened to an excessive point 
before parturition in order to make certain that high fat con- 
tent of the milk would result after calving. Ten days before 
the animals were due to ealve, blood was drawn from the 
jugular vein and analyzed for pereentage of fat. Blood sam- 
Ties were again taken after parturition when the conditions of 
underfeeding were strongest and again later when the animals 
were normal. The method of analysis used was the Kama- 
