UNIVERSITY OP WISCONSIN STUDIES 



ficient sugar is not oxidized in the cells the sugar hungry 

 <?ells attract fat. Dextrose is converted into milk sugar in 

 the mammary gland and cannot then be burned in the or- 

 ganism; the mammary cell becoming a sugar hungry cell 

 attracts large amounts of fat which is present in the blood. 



TABLE IV 



EFFECT OF UNDERFEEDING ADVANCED LACTATION 

 Jersey Cow No. 2 



The author in connection with Dr. L. S. Palmer has given 

 some attention to the question of the cause of this increase in 

 fat content which accompanies underfeeding. A series 

 of experiments was conducted to test a theory that the in- 

 crease in the fat in the milk is due to an increase 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 calve, blood was drawn from the 

 jugular vein and analyzed for percentage of fat. Blood sam- 

 ples 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- 



