6l2 



Journal of Agricultural Research 



Vol. X, No. 12 



In the case of maize the metaboHzable energy was estimated at 3.9 

 Calories per gram of digestible organic matter as in the case of other 

 similar concentrates. As shown above, the actual average is about 3.75 

 Calories per gram — that is, lower than that of other concentrates which 

 have been experimented with — so that the tabulated results are somewhat 

 too high. 



In the case of the hominy feed an error was made, we believe, in the 

 other direction by using too low figures for the average digestibility of 

 this material. On the basis of the results here discussed, we submit the 

 following corrections (Table XXII) for the table referred to: 



Table XXII. — Net energy values per 100 pounds (with average water content) for cattle 



Feedstuff. 



As pub- 

 lished. 



Corrected. 



Maize, dent. , 

 Maize, flint. . 

 Maize meal. . 

 Hominy feed 



Therms. 

 89. 16 

 87.50 

 88.75 

 81.31 



Therms. 



85-50 



84. 00 



85. 20 

 88.78 



SUMMARY 



A comparison is reported of the metabolizable energy and of the net 

 energy value of hominy feed as determined in an experiment on a grade 

 Hereford steer with the corresponding values for maize meal ground from 

 the same grain, as determined in a parallel experiment on a full-blood 

 Hereford of about the same age. Data are also reported as to the partition 

 of the ingredients and energy of maize meal among the products of its 

 milling for the production of hominy. 



An increase in the amount of the mixed ration of hay and hominy feed 

 consumed resulted in a slightly decreased digestibility, while a greater 

 increase in the amount of mixed hay and maize meal consumed caused 

 a considerable decrease in digestibility. 



The average percentage losses of energy in the excreta were greater 

 with maize meal than with hominy feed, chiefly on account of the some- 

 what lower digestibility of the former, notably in the heavier ration. 



The metabolizable energy per kilogram of dry matter and per kilogram 

 of digestible organic matter was greater for the hominy feed than for the 

 maize meal, the difference being due to the higher gross energy and smaller 

 losses in the former case. 



The increment of heat production by the animal per kilogram of dry 

 matter consumed was slightly less for the hominy feed than for the maize 

 meal but slightly greater than the average of all experiments on the latter 

 material. 



The net energy value of the hominy feed in this experiment was dis- 

 tinctly greater than that of the maize meal. A computation of the net 



