BASING STANDARDS ON QUALITY OF MILK 



79 



4. That size and weight of the animal influence the 

 food requirements similarly as worked out in 

 the old standards. 



The Haecker Standard is based on two general 

 propositions : First, the maintenance requirements 

 of a cow weighing 1,000 pounds; and, second, an 

 additional and shifting allowance of digestible nutri- 

 ents that is dependent on the per cent of butter fat 

 contained in the milk. The maintenance factor is 

 0.7 pound of protein, 0.7 pound of carbohydrates 

 and o.i pound of fat. For cows weighing more 

 than 1,000 pounds these quantities are proportionately 

 increased, and for cows weighing less than 1,000 pounds 

 they are proportionately decreased. If, for instance, a 

 cow weighs 1,100 pounds, the amounts of each nutri- 

 ent for maintenance would be as follows : Protein, .77 

 pound; carbohydrates, .77 pound; and fat, .11 pound. 

 The additional food requirements are dependent 

 on the quantity and the fat content of the milk as 

 arranged below : 



NUTRIENTS REQUIRED BY THE HAECKER STANDARD 



