116 



Feeds and Feeding. 



IV. The Haecker St.\ndard for Dairy Cows. 



As the result of long years of intimate study with a high- 

 grade working dairy herd at the Minnesota Station,^ Haecker holds 

 that the feed requirements of the dairy cow vary not only accord- 

 ing to her weight and the quantity of milk yielded, but also ac- 

 cording to its quality. 



140, The Haecker standard. — In his standard Haecker first sets 

 down the total digestible nutrients daily required to maintain the 

 1000-lb. cow, independent of the milk she produces, as follows: 

 Crude protein 0.7 lb., carbohydrates 7.0 lbs., and fat 0.1 lb. 



For each 100 lbs. in live weight the cow may exceed or fall 

 below the 1000-lb. standard there is added or subtracted one-tenth 

 of the standard ration. 



To this maintenance provision the further allowance set forth 

 in the table is made. 



The table shows that if a cow is yielding milk containing 3 

 per ct. of butter fat, she should be fed in addition to the main- 

 tenance ration 0.040 lb. crude protein, 0.19 lb. carbohydrates, and 

 0.015 lb. fat, all digestible, for each lb. of milk she gives. If the 

 milk is richer than 3 per ct. the provision must be greater. 



To illustrate the use of the table there is below formulated the 

 nutrient allowance for a 1100-lb. cow producing 25 lbs. of 4 per 

 ct, milk daily : 



' Buls, 35, 67, 71, 79, and information to the author. 



