PHYSICAL PROPERTIES OF MILK 



81 



Relative Color Production under Special Feeding Conditions 



Cow 



Breed 



Pounds 



Green 



Alfalfa 



Hay 



Green Feed 



(Dry Matter 



Basis) (i) 



Pounds 

 Milk-fat 

 per Day 



Color 



i No. 



Yellow 



Red 



34 



41 



11 



13 



208 



211 



219 



Jersey 



Jersey 



Jersey 



Jersey 



Holstein 



Holstein 



Holstein 



10.0 

 12.0 

 8.0 

 8.0 

 15.0 

 12.0 

 12.0 



42% 



41% 



40% 



45.5% 



35% 



28% 



28% 



1.34 



1.78 

 1.51 

 0.58 

 1.23 

 2.13 

 1.50 



29.0 

 29.0 

 24.0 

 33.0 

 19.0 

 17.0 

 19.0 



1.6 



1.6 

 1.3 

 1.6 

 1.6 

 1.5 

 1.7 



The most interesting feature of the above table is to note that 

 on the basis of the percentage of green dry matter in the ration, 

 the Jersey cows produced the highest-colored fat because they 

 received the highest percentage of green dry matter. By taking 

 into consideration also the difference in fat production, an inter- 

 esting calculation can be made with the figures of average color, 

 fat production, and percentage of green dry matter in the ration, 

 which will cause the relative color production of the two breeds 

 to approach almost unity. 



Holsteins 



Average per cent of green feed in ration 



Average fat production 



Average color of fat (units of yellow) 



30% 



1.6 lb. 

 18.0 



If it be assumed for the moment that there is no breed charac- 

 teristic, we can say that 30 per cent green feed in the ration of the 

 Holsteins produces 18 units of yellow in the fat for the same 

 reason that 42 per cent green feed in the ration of the Jerseys 



1 Per cent of moisture free green feed in total ration. 



nnip 



