66 ILLINOIS STATE DAIRYMEN'S ASSOCIATION 



the animal so we can tell how much is needed for her main- 

 tenance. It is very obvious that a cow yielding a large 

 quantity of milk will require more feed than a cow of the 

 same size yielding a small quantity of milk. It is equally 

 obvious that it will require more feed to produce milk with 

 high butterfat content than it will to produce milk with a 

 low butterfat content. 



First, we must find how much protein, carbohydrates 

 and fat are required for maintenance (see following table) : 







Table. 









Food Required 



for Maintenance. 





Weight 













of Cow 



Protein 







Carbohydrates 



Fat 



800 



0.560 







5:60 



0.08 



900 



.630 







6:30 



.09 



1000 



.700 







7:00 



.10 



1100 



.770 







7:70 



.11 



1200 



.840 







8:40 



.12 



1300 



.910 







9:10 



.13 



1400 



.980 







9:80 



.14 



Second, we must find how much fat, protein and carbo- 

 hydrates are needed to produce the particular quality of 

 milk that this individual animal is giving (see following 

 table) : 



Table. 



Nutrients Required for the Production of Milk with Given Butterfat 







Content. 







Amount 











of Milk 



Percent 









Lbs. 



of Fat 



Protein 



C. H. 



Fat 





3.0 



.047 



.20 



.017 





3.4 



.049 



.22 



.018 





3.8 



.052 



.23 



.020 





4.2 



.055 



.25 



.021 





4.6 



.058 



.27 



.023 





4.8 



-059 



.28 



.024 





5.2 



.062 



.29 



.025 





5.6 



.064 



.31 



.026 



Third, having multiplied the amount of protein, fat 

 and carbohydrates required for one pound of milk by the 

 number of pounds of milk which the cow is giving, we must 

 add the amount of protein, fat and carbohydrates required 

 by this individual for maintenance and the result is that we 



