32 ELEMENTS OF DAIRY TYPE 



able to consume a quantity much greater than maintenance or 

 not. This may be illustrated by Figure 9 below. 



Let the top line represent a cow of moderate feed-taking 

 powers and her total consumption by the length of the line A C 

 and her feed cost of maintenance by that part of the line repre- 

 sented by A B. Since A B amount is burned up daily to keep 

 the animal warm and in strength it necessarily follows that only 

 that quantity of feed represented by the short line B C can 

 possibly be used for milk formation, whereas in the case of the 

 second animal, assumed to weigh the same, therefore requiring 

 approximately the same amount of feed for daily upkeep, 

 namely, amount shown by line D E, being able to consume a 

 quantity represented by D F and having a surplus shown by 

 E F which is twice as great as amount B C, must, of necessity, 



A B C 



\ 



o £ r 



Fig. 9. —Illustrating need of capacity in cows. 



after supporting herself, have left in her system twice as much 

 nutriment for the formation of milk a-s the first cow. She has 

 not consumed twice as much feed by any means, yet the surplus 

 is twice as great. 



This may be illustrated by two men. Smith earns $1 a 

 day, or $6 a week. Jones earns $2 a day, or $12 a week. If it 

 costs each $5 a week to live, Smith has left, at the end of the 

 week, only $1, whereas Jones has $7. Jones took in only two 

 times as much as Smith, yet has seven times as much surplus 

 with which to do outside work. 



The capacity of a cow is produced partially from the neces- 

 sity of consuming liberal quantities of succulent roughage while 

 in her young, growing condition, but to even a greater extent is 

 produced after she starts milking. We must not look upon a 

 cow as a machine into which we may stuff so much feed and 



