490 



Bulletin 268. 



Comparing the Dry Matter in Mangels with the Dry Matter in Grain, 

 WITH Mangels for Succulence in Full Grain Ration, and Silage for 

 Succulence with Mangels in Place of One-half the Grain 



Dry matter 



in 



mangels 



2562.9 



In studying Tables XXIV, XXVI, and XXVIII, in order to compare 

 the cost of one pound of fat in the different rations, it will be noticed 

 that the average results as shown at the foot of these tables are not 

 just alike. For example, in Table XXIV the average cost of one pound 

 of fat with ration I is .212, while in Table XXVI it is .202; and there 

 are similar differences with rations II and III in the other tables. These 

 variations with the same ration are due to the individual variations 

 of the animals fed on the ration at different times. In the summary 

 below, made from Tables XXIV, XXVI, and XXVIII the averages are 

 arrived at by using the results obtained with all the cows fed each 

 particular ration. While the results do not differ materially from those 

 given at the foot of the tables, this explanation is inserted so that the 

 reader will not be confused by slightly different average results which 

 he might think should be identical. 



Summary Showing Cost of One Pound of Butter Fat with the Different 



Rations 



With 

 ration I 



, 207 



Taking into account the facts given in the above summaries, and 

 those given earlier in the detailed statements regarding the different 

 comparisons of dry matter, it is thought safe to draw the following 

 conclusions as being true under the conditions noted. 



(i) The amount of dry matter required to produce one pound of 

 butter fat, taking' the average of the results of all rations fed in this 

 experiment, was 21.83 pounds. 



(2) Less dry matter was required to produce one pound of butter 

 fat when mangels were fed as a succulent food with a full grain ration 

 than with any other combination. 



(3) The average cost of one pound of butter fat under all conditions 

 was 22.4 cents. 



