MANUAL OF CATTLE-FEEDING. 181 



ill other experiments (see pp. 9 and 176), sliowed, in many 

 eabos, a greater gain of fat tlian could be accounted for by 

 tlie protein and fat of the food. 



Later experiments have given similar and even more 

 decided resxdts. An increase of 100 pounds in the live- 

 weight has frequently been obtained with a fodder contain- 

 ing 10 to 16 lbs. of fat and 50 to 70 lbs. of protein. In 

 one case the above gain was made on a fodder containing 

 only 40.8 lbs. of protein and 6.8 lbs, of fat, while the weight 

 of the animals increased from 70.5 lbs. at the beginning of 

 the experiment to 246.5 lbs. at its close. These results 

 appear almost incomprehensible unless we admit a pro- 

 duction of fat from carbhydrates. 



Weiske & Wildt,* in Proskau, have attempted to solve 

 the problem by experiments on the same plan as those of 

 Iletmeberg, Kern & Wattenberg on sheep. Of four six- 

 weeks-old pigs, two were killed at the beginning of the 

 experiment, and the total quantity of flesh and fat in their 

 bodies was determined. Of the other two, one received a 

 fodder rather poor in protein for 184 days. The second, 

 which was to have been fed with a fodder rich in protein, 

 became sick, and was therefore excluded from the experi- 

 ment. 



At the close of the feeding, the sound animal was killed 

 and the flesh and fat present in his body determined, as in 

 the two other animals at the beginning of the experiment. 



On the assumption, now, that the first two pigs had, at 

 the time they were killed, the same composition as the one 

 which was fattened, we have only to subtract the average 

 of the former from the latter to find the amount of flesh 

 and fat produced during the feeding. 



* Zieitschriffc fur Biologic, X , 1. 



