Substitution of Roots for Concentrated Foods. 



483 



Table XXV. Dry Matter in Mangels and Grain Compared, when Silage 



WAS Fed as a Succulent Food in Both Periods. 



Gain or loss in fat, as due to feeding mangels 



1 2 1. 3 pounds less dry matter in hay and silage with mangels as grain in all 

 cases considered. 



ration III was fed, 12 1.3 pounds less dry matter was fed in the hay and 

 silage, which, if added to the amount of dry matter in the grain replaced, 

 would make the dry matter in mangels fully equal to the dry matter in 

 the grain. Furthermore, in four of the 16 comparisons ration III was 

 fed one feeding period farther along in the lactation period of each cow, 

 and in four more comparisons it was two periods, or with six weeks 

 intervening, farther along in the lactation period, whereas ration 

 I was never fed more than one period of six weeks farther along in the 

 lactation of the cows in the other eight cases. This fact would favor 

 the mangels. It would seem to be a safe assumption from the data 



