66 



improvement in the soil where even the stubble of cow- 

 peas, vetch, or other leguminous plants have grown. 



Amount of Food per pound of Butter. 



Since the cost of food fluctuates so widelj from year 

 to year, we may with jirofit reduce the data obtained in 

 both the preceding experiments to a more stable basis 

 by calculating the amount of air-dry food re(iuired per 

 pound of butter produced. 



Air drij food per poinid of hatter. 



Hay Uran 



ration. ration. 



Lbs. Lbs. 



1001-2. 



Vetcli hay eaten and wasted 6.82 



^^etch hay or bran consumed (1.43 0.76 



Basal ration . . . .' 10.84 10.67 



Total food consumed 17.27 17.43 



1902-3. 



Cowpea hay eaten and (16 per cent.) 



wasted 6 . 88 



( 'owpea hay or wheat bran cousuuhmI 5 . 74 5 . 95 



Basal ration ( \ concentrated food . . 16. 86 ■ 18 . 19 



rii 



Total food consumed 22 . 60 24 . 14 



l^iv(^ of tlu' co\\'s were used in the exi>eriments of both 

 winters. Each of them required a larger total amount 

 of food for the second A^'inter, chiefly because the basal 

 ration at that time contained a large amount of cotton 

 seed hulls, a nmterial having very low nutritive value. 



