236 FARM AND SCHOOL PROBLEMS. 



Adding this to the amount of protein and carbohydrates in 

 the 2 pound mixture, we have the following: 



0.2445 1.467 1:6 



815 of a pound is approximately two-thirds of a pound of bran. 



1190 



Since the amount of protein wanted in the balance of the 

 mixture is 2.09 pounds,* we can divide 2.09 by .2445 and the 

 quotient is 8.2-J- ; therefore we shall require 8.2-|- X 3 or 8.2 

 pounds of ground corn, and 8.2 X i and f pounds of wheat 

 bran which equals 13 2/5 pounds. 



This solution is given to show that we can combine feeds in 

 a ration and have it very approximately balanced. 



8. Mix a feed for a cow weighing 1,200 pounds, that gives 30 pounds 

 of milk testing 4 per cent butter fat. The ration is to be composed of 

 red clover hay, wheat bran and ground corn. 



9. Mix a ration of alfalfa hay 14 pounds, ground corn and New 

 Process linseed meal for a cow that weighs 1,000 pounds, and gives 60 

 pounds of milk testing 5 per cent fat. 



10. Mix a ration of 10 pounds alfalfa hay and 6 pounds of red 

 clover, and cotton seed meal, ground corn and wheat bran for a 1,400 

 pound cow, giving 60 pounds of 4 per cent milk. 



Cow Testing Associations. 



Cow Testing Associations have been organized for the pur- 

 pose of keeping accurate records of the amount of milk and 

 butter-fat produced by every cow included in each herd compris- 

 ing the organization. 



In a cow-testing association in a county in Nebraska, there 

 were 21 herds, numbering in all 435 cows. The man employed 

 by these 21 dairymen to do the testing spent one day each month 

 with each herd belonging to the association. As an expert he 

 gave instructions in feeding and such other information as was 

 necessary to bring about the most economical milk and butter- 

 fat production. 



