56 Bulletin 173. 



1:8.19 in the successive periods. Tliey found that '' the proportional 

 fat content of the milk remained nnclianged by the very wide 

 chano-es in the food." 



Klein ^ found that the addition of sunflower cake to the usual 

 ration of four cows was followed by an increased milk yield, while 

 it seemed to have no specific effect on the fat content of the milk. 



Maercker and Morgenf report a series of cooperative experi- 

 ments with farmers in which the effect of watery foods on milk 

 secretion was studied. Beet diffusion residue (beet pulp) was fee! 

 alone and also with potato residue (from starch manufacture) in 

 addition to a basal ration of hay, straw and grain. The amounts of 

 residue fed daily w^ere such as to give quantities of w^ater ranging 

 from 43 to 150 pounds per head. The experimental periods were 

 ten days each. They found that the quantity of milk increased 

 regularly with the increase of watery food up to 116 pounds, and 

 that the increase in watery food was without discernible effect upon 

 the composition of the milk. 



Juretschke :J: has found as a result of the addition of -1 to 5 pounds, 

 per thousand pounds live weight, of cotton seed cake, i*ape cake, 

 and peanut cake to a basal ration consisting of hay, straw, brewers' 

 grains and w^heat bran, that the " milk secretion is not directly Imt 

 only indirectly affected by feeding and that the feeding of large 

 amounts of fat does not increase the amount of butter-fat in the 

 milk.'' 



Backhaus§ found by feeding ten cows on a basal ration of hay, 

 straw, brewers' grains, etc., and alternating in periods of two weeks 

 with peanut cake, palm nut cake and cotton-seed oil cake, that in 

 order to bring about changes in the fat content of milk very little 

 can be accomplished by the kind of food, and that the favorable 

 effect of some concentrated foods which have been found to increase 

 the fat take place only when large quantities are fed. 



Soxhlet II reports some investigations on the production of milk 



* Milch Zeitung 21 (1893), p. 673. 



f Translation in Experiment Station Record, Vol. 3 (1892), p. oo7. 



JMolkerei Zeitung 7 (1893), p. 518. 



§ Journal fiir I.amhvirtschaft 41 (1893), \). 32.S. 



II Translation in Experiment Station Record, Vol. 8 (1897), p. 1016. 



