398 MISSOURI AGRICULTURAL EXP. STA., RESEARCH BULLETIN NO. II 



moderate flesh were fed wheat straw alone for sixty days or until the 

 animals had lost as much fat as was considered necessary for the 

 second part of the experiment. The daily ration of cow No. 25 

 was then changed to 9 pounds of yellow corn and 20 pounds of green 

 alfalfa hay, which was rich in carotin and xanthophylls. Cow No. 21 

 was given a daily ration averaging 11.4 pounds of white corn and 

 14 pounds of bleached clover hay, very deficient in carotin and xan- 

 thophylls. Cow No. 25 was slaughtered at the end of 81 days. Her 

 gain in weight during this period was 160 pounds. Cow No. 21 

 was slaughtered at the end of 95 days. She had gained materially 

 in condition during her "fattening" period although the scales showed 

 little gain in weight. This was probably due to a much greater "fill" 

 when receiving wheat straw. Samples of fat from various parts of 

 the body were taken from each cow at slaughtering and used for 

 color readings. The results aire given in Table 3. The colorimetric 

 readings in this and subsequent tables were made on the rendered, 

 melted fat, measured by the Lovibond Tintometer. A complete de- 

 scription of this instrument may be found in the preceding paper of 

 this series. 



TABLE 3. THE RELATION OF FEED TO COLOR OF BODY FAT. 



The results of this experiment are even more striking when 

 the amount of fat on the various parts of the bodies of the two 

 cows is taken into consideration. Aside from the kidney fat and 

 pelvic cavity fat, which were probably not disturbed to any extent 

 during the starvation period, and which furthermore were of equal 

 color in the two animals, the largest proportion of the entire fat 



