STANDARDS FOR MILCH COWS 177 



The sum of the maintenance and the milk production require-' 

 ments is the amount required. 



Requirement Requirement at«^A.,^A 



for for milk ^*?,"f"rt 



maintenance production requirea 



Pounds of protein 0.595 + 1.182 = 1.777 



Pounds of carbohydrates 5-950 + 5.704 ^^ 11.654 



Pounds of fat 0.085 + 0.414 = 0.499 



As previously stated the standards in the table are on the 

 basis of 1,000 lbs. live weight. Therefore to compute the stand- 

 ard for a cow of this weight (i,ooo lbs.) it is not necessary to 

 figure the maintenance and milk production requirements, as 

 this work has already been done and is included in the table. 



A Eation. — The following ration for a cow weighing i,ooo 

 lbs. producing 25 lbs. of milk daily, testing 4 per cent, butter fat, 

 illustrates how feed stuffs may be compounded to meet the 

 standards as laid down in this table. 



Fat 

 pounds 



2 lbs. linseed meal (new process) 



6 lbs. corn and cob meal 



2^ lbs. dried brewers' grains . . . 



40 lbs. corn silage 



6 lbs. red top hay 



Ration 



Standard 



0.06 

 0.17 

 0.13 

 0.28 

 0.06 



0.70 

 0.50 



The carbohydrates and fat are a little high but the ration 

 approximates the standard close enough for all practical pur- 

 poses. 



A Narrow Nutritive Ratio is Sometimes Economical. — Dairy- 

 men have learned by practical experience that Haecker's stand- 

 ards are too wide (that is there is too high a proportion of 

 carbohydrates and fat to protein) for the most economical pro- 

 duction of milk where protein is cheap and carbohydrates rela- 

 tively expensive. In all probability Haecker's table is suitable 

 for the Northwest and other sections where protein is expen- 

 sive and carbohydrates comparatively cheap. Prof. E. L. Jor- 



