The Relation of Food to Milk-Fat. 59 



with pi-eliminary periods ranging from 2 to 16 days in length. The 

 amount of protein in the rations was kept constant while the fat 

 was increased from .297 kilograms to 1.706 kilograms per head daily. 

 They found that the feeding of such large amounts of fat increased 

 the percentage of fat in the milk, but reduced the yield so much as 

 to make such feeding unprofitable. 



Kellner and xlndra""^ compared sugar beets with dried and ensiled 

 beet diffusion residue l)y feeding them alternately to twenty-four 

 cows during four periods of twenty days each. They found that 

 " tlie substitution of 4.4 kg. of dried diffusion residue for 27.5 

 kg. of sugar beets increased the milk yield .953 kg. and the substi- 

 tution of 41.8 kg. of ensiled diffusion residue for the above amount 

 of sugar beets increased the milk yield 1.721 kg. per cow (of 550 kg. 

 live weight) without causing any material change in the quality of 

 the milk." 



Friisf reviews the co-operative cow feeding experiments conducted 

 by the Experiment Station at Copenhagen, Denmark since 1888, 

 with especial reference to the effect of food on the fat content of 

 tlie milk. The summary of 76 series of experiments is given. The 

 rations used were such as could be regarded normal for milch cows, 

 such as are met with in the feeding practice on Danish dairy farms. 

 The question whether abnormal feed mixtures can appreciably 

 change the fat content of milk was not included in the investiga- 

 tion. The autlior says " it was found that different feeding stuffs 

 and food mixtures in a very large measure influence the quantity of 

 milk yielded as well as the health and"general condition of the cows. 

 The feed under practical conditions as found in this country, exerts 

 an entirely insignificant influence on the fat content of the milk. 



Rhodin;}; emulsified linseed oil in a specially constructed machine 

 and fed from 250 to 750 grams of emulsion daily as a drink in water 

 to each of two cows during seven-day periods in addition to a nor- 

 mal mixed ration. During tlie first periods of feeding the oil, the 

 fat content of the milk was increased, but during the third period 



* Landwirtschaftliche Versuchs Stationeu 49 (1898), p. 402. 

 t Translation b\- F. W. Woll in Experiment Station Record Vol. 10 (1898), 

 p. SC. 



t lAIilcli Zeituug 37 (1898), p. 806; p. 323. 



