240 



Agricultural Chemistry. 



assimilation and production of tissue. The last two columns ex- 

 press the energy value of the increase and the comparative pro- 

 ductive value o the different materials, with starch as a unit. 

 We see from this that 56.3 per cent of the digested fat (peanut 

 oil) was stored, and 44.7 per cent of the digested protein (wheat 

 gluten), while but 17.8 per cent of the digested wheat straw was 

 available for useful energy or increase. This gives us a scien- 

 tific explanation of the fact that coarse feeds are not adapted to 

 rapid production. 



From such data Kellner concludes that 1 pound of digested 



Heat Values of Digested Feeds and of the Increase Obtained 

 in a Fattening Ox. 



starch may yield a maximum of 0.23 pound of body fat, the rest 

 being consumed in the transformation processes. Taking 1 pound 

 of digestible starch as his standard, he has formulated the relative 

 values for the digestible nutrients in feeding stuffs, based on the 

 amount of body fat the several pure nutrients would form if fed 

 to the ox. 



Kellner's starch values. These are the values of the nutrients 

 of feeds expressed with starch as a unit of energy. From the 

 quantities of digestible nutrients in 1000 pounds of ordinary feed- 

 ing material, the relative value of feeds for maintenance and 



