140 



PRINCIPLES OF FEEDING FARM ANIMALS 



man, whose standards have been discussed, Haecker, Savage, 

 Woll and Humphrey, and Eckles. 



The Haecker standard for dairy cows has been developed 

 by Haecker of the Minnesota Experiment Station ^ during 

 many years of experimentation. He holds that the feed 

 requirements of the dairy cow vary not only according to 

 her weight and the quantity of the milk yield, but also ac- 

 cording to the quahty of the milk. 



According to Haecker, a 1000-pound cow requires for 

 maintenance 0.7 lb. of digestible crude protein, 7.0 lb. of 

 digestible carbohydrates, and 0.1 lb. of digestible fat. For 

 each pound of 4 per cent milk the Haecker standard requires 

 the addition of 0.054 lb. of digestible crude protein, 0.24 

 lb. of digestible carbohydrates, and 0.021 lb. of digestible 

 fat in addition to the maintenance requirement. If the 

 milk contains less than 4.0 per cent of fat, smaller amounts 

 of nutrients are prescribed, while if the milk contains more 

 than 4.0 per cent fat, larger amounts of nutrients are pre- 

 scribed. The amounts of digestible nutrients to produce 

 one pound of milk containing various percentages of butter 

 fat are given in Table 16. 



Table 16. — Haecker's Standard for Milk Production 



1 Bui. 130, 140. 



