74 



Coiintinjj: ,i]:roon rye at $2.00 por ton and otbor food- 

 stuffs at ])i'ices before mentioned, we find that tlie cost 

 of food to make one pound of butter was 15.4 cents when 

 cotton seed meal "v\'ns fed and onlv 10.5 cents when cot- 

 ton s<»ed was fed. 



This dilTerence in favor of cotton seed over cotton 

 se(Hl meal as an economical producer of butter is appar- 

 ently too great to be attributed to individual peculiari- 

 ties of the cows of the two lots, which were chosen with 

 reference to their practical equality. 



Direct comparison of green rye as a substitute for 

 either cotton seed hulls or sorghum hay can not be made 

 in this experiment. However the substitution of rye 

 for cotton seed hulls, and also for sorghum hay, reduced, 

 the cost of butter, partly perhaps because the large 

 amount of green rye eaten made it practicable to re- 

 duce the amount of concentrated food. 



Comparing the average daily product during period 

 III with that of the last two weeks of period II, and mak- 

 ing no allowances for the fact that the cows while on rye 

 were further removed from time to time of calving than 

 when receiving sorghum or cotton seed hulls, we find: 



(1) That the substitution of 52 lbs. of green rye for 

 14.9 lbs. of hulls (grain also being reduced when rye 

 was fed thus changing the nutritive ratio from 1 :4 to 

 1:3.7), was accompanied by a shrinkage of 19 per cent, 

 in butter and 9 per rent in milk. 



(2) That the substitution of 54 lbs. of green rye for 

 9.1 pounds of sorghum hay (grain also being reduced 

 when rye was fed, changing the nutritive ratio from 

 1 :6.5 to 1 :7.3) increased the yield of milk hj 18 per cent, 

 and the yield of butter to the extent of 6 per cent. 



The results of feeding rye were highly satisfactory 



