Animal Nutrition. 53 



elev^en montlisi on the same preparatory ration of 2.2 to 3.3 poiinda 

 of barley meal per day, and during the five days preceding the 

 experiment proper, 4.4 pounds of rice meal. At this time the 

 pigs weighed 219, 220 and 213 pounds. One of the pigs was then 

 killed and its body analyzed, while the others were put on a ration 

 of 4.4 pounds of boiled rice, and later on 3.3 pounds of rice, with 

 some meat extract, both of which foods are almost free from 

 fat. One of these animals was killed after 75 days, and the other 

 after 82 days of such feeding, and their bodies analyzed as in the 

 case of the first animal. On the assumption that the composi- 

 tion of the bodies of all the pigs was the same when the first pig 

 was killed, the investigator found the quantity of fat formed in 

 the bodies of the two animals and its source to be as shown below: 



Feeding trial with pigs to show formation of fat from 

 carbohydrates — Soxhlet. 



Pig III. 



Fat formed in body during experiment. 

 Talten up in the food. 



Formed from components not fat in the food. 



Nitrogen in the food. 



Protein production 



Fat formed throughi decomposition of protein.* 

 Fat formed from carbohydrates 



♦Protein consumed X 51.4. (78) 



Four to six times as much fat was consequently formed in the 

 bodies of these animals as could have been derived from the fat 

 and protein of the food. Even if there was some dificrence 

 in the condition of these animals at the end of the prelimin- 

 ary feeding, it could not be large enough to overthrow the 

 conclusion that the carbohydrates were the source of the greater 

 portion of the fat produced during the experiment. 



Meissl and Strohmer, ^ also experimenting on swine, fed two 

 kilograms of rice daUy to a one-year old pig weighing 309 

 pounds. During a part of the time the pig was confined in a 

 Pettenkofer respiration apparatus and the respiration products 

 determined. Of the data obtained the following are reproduced: 



Jahresb. d. Thier Chemie, 13, p. 39. 



