1922.] PUBLIC DOCUMENT — No. .31. 27a 



Annual Nutrition, 



Animal Metabolism. 



Department of Plant and Animal Chemi.strj/. 



Project 1. "A study of the chemistry of butter fat and the 

 effect of food in modifying its chemical and physical character." 

 Professor Holland, Assistant Professor Archibald 



and Mr. Dunbar. 



An exhaustive report has been prepared for publication on the 

 studies relative to the influence of breed, period of lactation, 

 and of the different oils and fats in the ration fed, on the com- 

 position of the resulting butter fat. This report includes: (1) 

 composition of butter fat from mixed herd milk, grade Hol- 

 steins and grade Jerseys, on normal rations; (2) composition 

 of butter fat from the milk of single animals, grade Holsteins 

 and grade Jerseys, relatively fresh in lactation, on normal 

 rations; (3) composition of butter fat from the milk of single 

 animals of breeds stated, fresh, intermediate, and late in 

 lactation, on a normal ration; (4) composition of butter fat 

 from mixed milk, grade Holsteins, on a normal ration and 

 with the addition of different oils and fats; (5) summary of 

 data, together with such general deductions as seem war- 

 ranted. 



Digestibility of Feeding Stuffs. 



Department of Plant and Animal Chemistry. 



Project 2. ''Digestion experiments." 



Professor Lindsey and Assistant Professor Archibald. 



The only investigation made under this definite project for 

 the last calendar year was with feterita, a member of the milo 

 maize group. Digestion work was carried on, however, under 

 Projects 11 and 12 of this department. 



Project 9. "Determining the digestibility and metabolizable 

 energy in feeds for horses." 



Professor Lindsey and Assistant Professor Archibald. 



Work on this project has been completed, and the data ob- 

 tained will shortly be assembled in manuscript form. 



