98 



into two lots as nearly equal as possible, and while those of one lot 

 received equal parts of corn and cob meal and bran, those of the other 

 received ecjual parts of cotton-seed meal and bran. The coarse fodder 

 was the same for both lots in each experiment and consisted variously 

 of hay and pasturage, silage, or silage, pasturage and sorghum. The 

 amounts of food given and the duration of the experiments are not 

 stated. The milk for each lot was mixed and set by itself After the 

 feeding had been continued for 12 days, samples of the whole milk 

 and skim milk were taken for analysis. The fat in the whole milk was 

 determined by the Patrick milk test, and that in the skim milk by the 

 Adams gravimetric method. The results of these analyses, and the 

 percentage of the total fat which was left in the skim milk, are tabu- 

 lated for each lot in each experiment. The averages of these results 

 are given below : 



Milk set in cans at 70- J^*. 



Withnnt cotton-seed meal. 



Nnmber 

 of days { 

 since Inst 

 calving. 



Fat in 

 whole 

 milk. 



Per cent 

 Fat in of total 

 Hkini I fat left 

 milk. I in skim 

 milk. 



With cotton-seed me.il. 



Fat in 

 wliole 

 milk. 



Per cent 



Fat in of total 



Hkini fat left 



milk. I in skim 



milk. 



First experiment 104-124 



Seconil exjiiTiment 8«-93 



Third experiment 49-51 



Perct. 

 5.22 

 4.08 

 4.40 



Per ct. 

 1.63 



1.28 

 0.64 



Peret. 

 30.9 

 31.8 

 14.9 



Per St. 



5. H9 

 3.98 

 4.18 



Peret. 

 1.10 

 91 

 0.47 



Per ct. 

 18.4 



As will be seen, the separation of the fat by setting at 70° F. was 

 more complete from the milk of the cows receiving cottonseed meal 

 than from that of those receiving corn and-cob meal. "That the ettect 

 is m no sen.se due to individual peculiarity of cows, is proven, we think, 

 satisfactorily by the fact that different sets of cows were used in the 

 tests represented by each separate table, as above given, the food con- 

 dition showing itself uniformly the same with ditferent sets." 



Three other trials were made, in which the milk was set in cans at 46° 

 F., this temperature being maintained by the use of ice costing 1 cent 

 ]>er pound. In the first two trials the same 10 cows were u.sed, the milk 

 being skimmed in one exi)eriment after 12 hours and in the other after 2-4 

 hours' setting. The third experiment was with 8 cows nearly fresh in 

 milk, and the skimming took place after 24 hour.s' setting. In each 

 experiment the cows were divided into two lots, one lot receiving equal 

 parts of corn meal and bran, while the other received etpial parts of 

 cotton-seed meal and bran. The coarse fodder consisted in all cases of 

 silage and pasturage. 



The averages of the results stated are as follows: 



