Substitution of Roots for CoNcentr.\ted Foods. 481 



of butter fat per 100 pounds of dry matter. The cost of feed per 100 

 pounds of milk was $0,687 with silage and $1,055 with grain. The cost 

 of butter fat per pound was $0,131 with silage and $0,221 with grain. 

 The average net profit per month per cow was $5,864 with silage and 

 $2,465 with grain. Comparing the average daily product of each cow for 

 the entire test with her average daily product for the month before, 

 the cows fed silage decreased 2.84% in milk production and gained 

 1.89% in butter fat production. The cows fed the grain ration decreased 

 9.11% in milk and 14. 18% in butter fat production. The silage fed cows 

 gained in weight during the test an average of 47 pounds per head, while 

 the grain- fed cows gained an average of 57 pounds per head. These 

 results would indicate that silage can be made to take the place of a 

 considerable part of the grain ration. 



The Danish experiment.'^ The object of this experiment was to com- 

 pare the value of the dry matter in roots with a mixture of cereal grains. 

 Four groups of 10 or 12 cows each were chosen on six dairy farms. These 

 groups were fed similar rations during a preparatory feeding period 

 of 40 to 50 days. When the experimental period proper began on each 

 farm, Group A received seven pounds of grain (barley, rye and oats 

 mixed) ; Group B, four pounds of grain and four and one-half pounds of 

 cottonseed-meal; Group C, four pounds of grain and one and one-half 

 pounds of cottonseed-meal, and Group D, one pound of grain and four 

 and one-half pounds of cottonseed-meal. In addition. Groups A and 

 B were fed four and one-half pounds of dry matter in the form of mangels, 

 and Groups C and D seven and one-half pounds. Each group also 

 received daily six and one-half pounds of hay and 10 pounds of straw. 

 The nutritive ratios of the rations fed Groups A and C were between 

 1 :8 and 1 19, and of the rations fed to Groups B and D, between i :5 

 and 1:5.5. The average daily yield of milk per head for the different 

 groups was as follows: 



Group A 22.4 pounds. 

 B 23.7 

 C 22.5 

 « D 24.2 « 



The average fat in the milk produced by the different groups during 

 the experimental period proper was as follows: 



Group A 3.11% butter fat. 

 B 3.16% " « 

 C 3.11% « « 



D 3- 10% " " 



* Experiment Station Rgcord, Vol. 16. Page 801. 

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