DAIRY FARMING DAIRYING. 



587 



feeding gave the reaction after a time (about 30 minutes) under certain 

 conditions of temperature, strength of reagents, etc. T bis delayed 

 reaction is believed to be due to a decomposition of the furfurol, as the 

 reaction appeared sooner when large quantities of furfurol were present 

 and when the butter was heated with the reagent. This was also borne 

 out by experiments made with hydrochloric acid alone. 



These facts in regard to the reaction explain, the author believes, the 

 finding of sesame-oil reaction in butter by other investigators when 

 sesame cake was fed. Providing the reaction is made according to the 

 prescribed method of the Imperial Health Office, the experiments 

 indicate that no reaction due to the sesame-cake feeding will be found. 



The sesame-oil reaction in natural butter, Vieth {Milch Ztg.,27 

 (1898), N~o. 36, pp. ^6\3, 564). — The author cites a number of instances, 

 among others, some in his own laboratory, in which natural butter from 

 cows which had been fed sesame cake gave the sesame-oil reaction. 

 He considers, for this reason, that the determination of the adulteration 

 of butter with margarin by the "latent coloring" of the latter with 

 sesame oil can not be regarded as an easy and reliable means. 



Experiments on the effect on milk production of feeding sugar 

 beets and dried and ensiled diffusion residue, O. Kellner and 

 G. Andra (Landw. Vers. Stat., 49 {1898), No. 6, pp. 402-418).— This 

 experiment was made with 24 cows on a private estate, but was under 

 the immediate supervision of the Mockern Station. The time of the 

 experiment was divided into 4 periods of 20 days each, the first 8 days 

 of each period being regarded as preparatory. The cows were all fed 

 alike, receiving the same basal ration throughout and practically the 

 same amounts of digestible nutrients in the different periods. The 

 basal ration consisted of hay, straw, linseed meal, cotton-seed meal, 

 peanut meal, and wheat bran, to which was added, per 1,000 kg. live 

 weight, 50 kg. of sugar beets in the first and fourth periods, 8 kg. of 

 dried diffusion residue from a sugar-beet factory in the second period, 

 and 76 kg. of ensiled diffusion residue in the third period. The silo 

 used was merely a hole in the ground, not walled up or plastered; the 

 loss was 33 per cent in weight. 



The cows were milked three times daily and the weight of milk, spe- 

 cific gravity, and fat content (the latter by the Gerber method) were 

 determined. The total solids were calculated by Fleischmann's for- 

 mula. The results are given below : 



Results of feeding sugar beets and diffusion residue to cows. 



