286 



NUTRITION OF FARM ANIMALS 



Such an experiment must, of course, be made at a temperature 

 above the critical temperature (354) for the animal, since other- 

 wise the heat produced would be greater than that correspond- 

 ing to the necessary internal work by the additional amount 

 necessary to maintain the body temperature. 



Numerous determinations of the fasting katabolism of man 

 and of the smaller animals, such as the dog, cat, rabbit, guinea 

 pig, etc., are on record, but the only experiments of this sort 

 upon farm animals are those of Meissl, Strohmer and Lorenz 1 

 and of Tangl 2 upon swine. 



Meissl's determinations were made at about 20 C., a tem- 

 perature which, according to TangPs later results, is well above 

 the critical temperature for mature swine. In Tangl's experi- 

 ments the animals spent most of the time lying; in Meissl's 

 paper no statements are made on this point. 



Excluding those of Tangl's experiments which were appar- 

 ently below the critical temperature, the results, computed 

 per 100 pounds in proportion to the two-thirds power of the 

 live weight, were as follows : 



TABLE 44. NET ENERGY FOR MAINTENANCE OF SWINE 



i Ztschr. Biol., 22 (1886), 63. 



2 Biochem. Ztschr., 44 (1912), 252. 



