34 GIBBS AND AGCAOILI. 



of starvation, will deposit a body fat showing some characteristics of the 

 fat in the ration. 



Eosenfeld x has expressed the opinion that, with natural rations, the 

 properties of the fats of carniverous animals depend for the greater part 

 upon the character of the fat eaten, while this is less so for the her- 

 biverous animals, since the latter are better adapted for building their 

 body fats from carbohydrates. The "omnivorous" hog is, for economic 

 reasons, fattened upon carbohydrates. The fat of a grown animal in 

 normal condition is not affected by the character of the fat in the ration, 

 provided the same normal conditions are maintained. 2 For the purpose 

 of investigating these points, corn, palm, cotton seed, linseed, and rape 

 oils or cakes, some fatty acids, butter, and mutton fats have been 

 employed. 



On the other hand, it has been shown that milk fat is, to some extent, 

 affected by the character of the fat in a normal ration. The influence 

 of coconut oil, in this regard, has been investigated to a considerable 

 extent. 



Morse 3 found that coconut oil fed to cows changed the iodine number of the 

 butter fat from 31.6 to 24.2. 



Siegfeld 4 observed that coconut-oil cake exerted no apparent influence upon 

 the Reichert-Meissel, while the saponification and iodine numbers were influenced 

 to a marked extent. 



Knieriem and Buschmann '" found that the constants of the butter fat were 

 materially affected by feeding cows on rations of coconut cake, linseed' cake, rape 

 seed cake, etc. 



Tancre 6 states that palm-nut cake is an excellent feeding stuff for milch cows 

 when fed not to exceed 4 pounds daily and that coconut oil gives similar results. 



The effects of coconut oil upon the fat of the hog have not been investi- 

 gated, to our knowledge. Wheat bran as a hog feed, makes a yellow, 

 liquid lard and is not suitable. Pish meal makes the lard taste fishy. 

 Some lards give the Becchi and Halphen reactions when the hogs have 

 been fed on cotton seed cake. 



It has also been shown that the habit and environment will affect 

 the fat secreted. For example, the fat of the wild goose has an iodine 

 number of 99.6, while that of the bird in captivity is 67. 7 Lewkowitsch 



1 Magnus, Levy and Meyer, Handbucb d. Bio-ehem. d. Mensch. u. d. Tiere 

 (1909), 11, 453. 



1 Reviews of the literature are given by Magnus, Levy and Meyer, loc cit., 

 445, and Emmet and Grindley, Journ. Am. Ghem. Soc. (1905). 27, 263. 



'Exp. Sta. Record J h (1892-3), 662; N. E. Sta. Bui. 16, (1892), 20. 



'Exp. Sta. Record, 18, (1906-7), 172. 



'Ghem. Ztg. Rep. (1907), 31, 287. 



'Exp. Sta. Record 11, (1899-1900), 1084. 



r Voigtlander, Ztschr. f. ang. Ghem. (1898), 859. 



