206 



MANUAL OF FAEM ANIMALS 



would require approximately 3 pounds of milk solids, or an actual 

 secretion of one-half pound more solid matter in the milk. Thus 

 the cow yielding the 6 per cent milk would require more food 

 than the cow giving only 3 per cent milk. 



Haecker has conducted many experiments in an endeavor to 

 gain some knowledge of the relation between the percentage of 

 fat in the milk and the food required to produce the same. 

 From these experiments he has calculated the nutrients — 

 protein, carbohydrates, and fat — required for the production 

 of a given amount of fat, and using this as a basis, has con- 

 structed standards for milk production : — 



HAECKER's feeding-standard — MATURE COW ^ 



Table showing food of maintenance per 100 pounds live weight and nutri- 

 ents required for the production of 1 pound of milk testing a given per 

 cent of butter-fat 



For maintenance 



Protein 



0.0700 



Carbohydrate 



0.700 



0.0100 



Milk testing 2.5 

 Milk testing 3.0 

 Milk testing 4.0 

 Milk testing 5.0 

 Milk testing 6.0 

 Milk testing 6.5 



0.0362 

 0.0397 

 0.0467 

 0.0537 

 0.0607 

 0.0642 



0.164 

 0.181 

 0.214 

 0.247 

 0.280 

 0.296 



0.0124 

 0.0136 

 0.0159 

 0.0182 

 0.0206 

 0.0217 



To illustrate the method of using the table to determine the 

 amount of food required in milk production, choose the case of a 

 1000-pound cow yielding 22 pounds of milk daily. Let us as- 

 sume that in one case it contains 3 per cent fat and in a second 

 that it contains 6 per cent. 



' Minnesota Agricultural Experiment Station Bulletin No. 79. 



