324 SCIENTIFIC FEEDING OF ANIMALS 



was fed in the same way gave 26 Ibs. of milk with 

 3-92% of fat on the first ration, but on the poor one 

 only i8J Ibs. of milk with 3-80% fat. Calculated 

 upon the basis of milk with 12% dry matter and 

 neglecting the natural decrease in yield, there were 

 ioj- and 7J Ibs. less milk respectively on the poorer 

 ration. 



If, on the other hand, the change is made from 

 poor food to richer by several large additions, the 

 yield of milk increases where the ration is rich in 

 protein and the cows are good milkers, in propor- 

 tion to the extra nutriment. 



In an experiment with crushed beans it was 

 found that the addition of 3 Ibs. gave a daily in- 

 crease of 2 Ibs. of milk, and when 6-|- Ibs. of beans were 

 given there were 5J- Ibs. more milk ; with another 

 cow the increase was ij and 2j- Ibs. respectively for 

 the above amounts of beans. In a further experi- 

 ment with malt coombs, where 2 and 4 Ibs. were 

 added, the increase in milk was if Ibs. and 2-J- Ibs. 

 respectively, and in another case -66 and -80 Ib. 

 respectively. In both experiments the cows which 

 gave the highest increase were those which without 

 the added food gave the most milk (26 Ibs. and 26^ Ibs. 

 daily), the cows with the smaller increase for the 

 extra food only giving J.6J- Ibs. and 12 Ibs. The more 

 freely milking a cow then is, the greater, as a rule, 

 is the increase of milk which will follow an extra 

 supply of food. This increase has, of course, a 



