

FEEDING OF ANIMALS. 303 



calculated on the assumption that only 90 per cent of the 

 nitrogenous substance, and 90 per cent of the fatty matter, of 

 the food would be digested, it is seen that — for 100 increase 

 in live-weight 6.8 parts, for 100 total fat in the increase 10.8 

 parts, or for 100 newly-formed fat 13.9 parts, must have been 

 derived from carbohydrates. 



Lastly, in regard to experiment 1, reckoning only 80 per 

 cent of the nitrogenous substance and fat of the food to have 

 been digested and available, the result would be that 13.5 of 

 the 63.1 parts of fat in 100 of increase must have had some 

 other source than fat and nitrogenous substance of the food; 

 or reckoned for 100 total fat in the increase, 21.4 parts, or for 

 100 newly formed fat 26.7 parts, must have been derived from 

 carbohydrates. 



In regard to the alternative assumptions that only 90 or Portion of 

 only 80 per cent of the nitrogenous and fatty matters of the attdfau 113 

 food were digested, it may be stated that in Wolff's tables, matters 

 published in Mentzel und v. Zengerke's landwirthschaftlicher digested. 

 Kalender for 1890, he reckons 88 per cent of the nitrogenous 

 substance of beans, 89.9 per cent of that of lentils, 77.9 per 

 cent of that of bran, 79.2 per cent of that of maize, and 77 

 per cent of that of barley, to be on the average digested ; and 

 of the fatty matter of these foods, he reckons 87.5 per cent of 

 that of beans, 84.6 per cent of that of lentils, 70.6 per cent of 

 that of bran, 85.1 per cent of that of maize, but the whole, or 

 100 per cent, of that of barley to be digestible. So far, there- 

 fore, as experiment 1 is concerned, according to Wolff's factors 

 the truth would lie somewhere between the results supposing 

 90 and those supposing 80 per cent digested. 



Even in this experiment, then (No. 1), there is clear evi- Clear evi- 

 dence of the formation of fat from the carbohydrates, when f^X^ 

 deduction is made for indigestible nitrogenous and fatty mat- drates 

 ters consumed, and when it is reckoned that only 51.4 parts M™^ 

 of fat may be produced from 100 albuminoid substance. 

 Obviously, if only 42 parts of fat, as assumed by some, can 

 be formed from 100 albumin the evidence is clearer still. 



Turning now to experiment 4, in which the food was maize- 

 meal alone, given ad libitum, and the relation of non-nitro- 

 genous to 1 of nitrogenous substance was much higher than 

 in experiment 1, and much more appropriate for the rapid 

 fattening of the pig, the results are much more decisive. They still more 

 were indeed quite conclusive as originally calculated, without decislve ' 

 the emendations now adopted. 



The results, even as given in the first of the three columns, 

 in the calculation of which it is assumed that the whole of the 

 nitrogenous substance and fat of the food were digested and 

 available, show that — for 100 increase in live-weight 26.2 



