SELECTION OF THE INDIVIDUAL COW 127 



pounds of milk for each pound produced by No. 62, the in- 

 ferior cow kept in the same herd. These two cows were bred 

 so they calved one week apart, and were kept under the fol- 

 lowing conditions : 



1. Complete record kept of amount and composition of 

 feeds consumed. 



2. Ration fed the two cows of the same composition at all 

 times, the amount varied to suit the individual. 



3. Cows kept at uniform weight. 



4. Complete records made of milk produced and of its 

 composition. 



5. Cows kept farrow. 



6. Digestion trial conducted when the cows were at their 

 maximum production. 



7. Cows kept on maintenance for four months at the end of 

 the milking period to determine maintenance. Maintenance 

 ration of the same composition as that fed when produc- 

 ing milk to determine maintenance in terms of the ration 

 fed. 



The results were as follows : during the year, No. 27, 

 the better cow, produced 8522 pounds of milk and 469 pounds 

 of fat, while No. 62, the inferior cow, produced only 3188 

 pounds of milk and 169 pounds of fat. 



(1) The maintenance requirement was practically the 

 same for each. 



(2) The coefficient of digestion was almost exactly the 

 same. 



In the following tables are given the feed consumed during 

 the year, the amount of feed required for maintenance, 

 and the amount available for milk production by the two 

 cows. 



