!84 



ILLINOIS STATE DAIRYMEN'S ASSOCIATION 



fat more per day than each cow in Lot i, 5.9 pounds more for 

 the entire lot for the week. 



At the close of the first week of the test there was a differ- 

 ence of 4.69 pounds of fat in favor of Lot 1, making the differ- 

 ence from that of the previous week in production of the two 

 lots, 10.59 pounds. The average difference per week was 19.18 

 pounds. 



The total difference in production of fat between the two 

 lots for the 131 days was 359.56 pounds. This is equivalent to 

 2j4 times the average production of the cows in Lot 1 ; that is, 

 six and one-half cows on the balanced ration produced as much 



Table 2. — Amount of Butter Fat Produced by Each Lot Per Week, 

 Difference Per Week, and Difference Per Cow Per Day. 



Week 



Pounds 



butter fat per 



week 



Pounds differ- 

 ence per cow 





Lot 1 



Lot 2 



Difference 



per day 



Preliminary 



77.58 



83.48 



—5.90 



—.09 



1 



76.47 



71.78 



4.69 



.07 



2 



65.15 



59.21 



5.94 



.09 



3 



68.81 



56.24 



12.57 



.20 



4 



71.66 



54.87 



16.79 



.27 



5 



70.76 



48.30 



22.46 



.36 



6 



71.10 



50.31 



20.79 



.33 



7 



70.67 



46.52 



24.15 



.38 



8 



70.21 



46.22 



23.99 



.38 



9 



70.30 



46.47 



23.83 



.38 



10 



70.37 



46.85 



23.52 



.37 



11 



66.52 



44.46 



22.06 



.35 



12 



66.02 



46.08 



19.94 



.32 



13 



65.55 



42.75 



22.80 



.36 



14 



63.55 



44.33 



19.22 



.31 



15 



63.58 



41.67 



21.91 



.35 



16 



62.71 



41.83 



20.88 



.33 



17 



62.57 



41.80 



20.77 



.33 



18 



59.62 



39.98 



19.64 



.31 



5 days 



41.67 



28.06 



13.61 



.30 



Total 



1257.29 



897.73 



359.56 



.305+ 



fat as the nine cows on the unbalanced ration. This 359 

 pounds of butter fat at 25 cents per pound would be worth 

 $89.75. The loss on nine cows would be practically $10 per cow, 

 besides the loss of skim milk, the injury to the cows, and the 



