ANIMAL I'KolH « TION. 



381 



nutrients ami fuel value, and also the maintenance value and production value on 

 the basis of the results obtained with the respiration calorimeter: 



/•'//, / i a! n, >■, mainU nana values, <<ml production valvn a />< r pound oj & i . ral ft < d\ 



Actual Mainte 



< lomputed 



from 



digestible 



nutrients. 



Absolute values: I 'alories. 



Timothy hay 



Clover hay 901 



Corn meal L.525 



Relative values: 



Timothy hay 1. 00 



Clover hay L03 



< 'urn meal 1.74 



nanc. 

 value. value 



fuel 



777 

 742 



LOO 

 I. 68 



I 



1,016 



1. 00 



2. 1 1 







As will be noticed, both the production and maintenance values are decidedly 

 lower than the values computed Erom digestible nutrients or from fuel value. 



"Coarwe fodders in particular were found to have much lower values, for mainte- 

 nance as well as for fattening, than concentrated feeds, the relative values of the 

 former as compared with the latter being greatly overestimated in the feeding tables 

 in common use." 



The author calls attention to the fact that the results at presenl available are not 

 aumerous and therefore that deductions are suggestive father than final. 



"On the other hand, however, it is belie veil that the distinctions which . . . [the 

 figure obtained] show between the digestible nutrients, the fuel values, the mainte- 

 nance values, ami the production values, as well as the differences between different 

 classes of feeding stuffs, in these respects are significant. In other words, it is 

 believed that the differences are too great to be explained by experimental errors. 



•'When we find, for example, that oh the basis of digestible nutrients 1 74 pounds 

 of timothy hay are the equivalent of LOO pounds of corn meal, while the actual 

 experiment on the animal shows that for maintenance 21 1 pounds and for fattening 

 l'7.'-5 pounds of timothy hay are required to equal LOO pounds of corn meal, we are 

 dealing with differences too large to be accidental and too important to be ignored 

 in the practical computation of rations. 



'• Furthermore, these results show that the only safe basis for a comparison of the 

 values of feeding Stuff S is the actual experiment upon the animal, in which the real 

 gain or loss of flesh and fat is accurately determined. In other words, the only way 



to ascertain the nutritive effect is to actually determine it." 



On the basis of available data, the production value per ion pounds has been com- 

 puted for a number of the common American feeding Btuffs. Some of these values 



are as follows: 



Production values />< r 100 pounds of a numbi r offet ding stall's. 



Feeding -nut". 



Total dry 

 matter. 



< ireen fodder and silage: 



Alfalfa 



Clover, re<l 



Corn fodder 



Corn silage 



Timothy 



Hays: 



'Alfalfa 



Clover, red 



Soy bean 



Timothy 



Pounds. 

 28.20 

 29.20 

 20.70 



38 l" 



91.60 

 84.70 



88 7m 



Total crud< 

 fiber. 



Pounds. 



14.80 

 19 60 



Proteids. 



2.50 

 2.21 



0. II 

 1.21 



i. in 



6.93 

 5. I! 

 7.68 

 2.05 



Carbo 

 hydrates. 



i inls. 



1 1 . -J" 



1 I. 82 

 L2.08 

 L4.56 

 21.22 



38.15 



- 

 13. 72 





hi nils. 



0. II 



0.37 



0.64 



1.38 

 L.81 



1 . 54 



1. i: 



Production 



value. 



I 



10,806 

 14,528 

 LI. 024 



34, US 

 34,748 



