80 



MANUAL OF MILK PRODUCTS 



This point of relative color production is also clearly shown 

 when comparing the fat produced by individual members of the 

 breeds. The next table shows the color of the fat from two 

 Jerseys and one Holstein cow under feeding conditions most 

 favorable for the maximum color. These animals were pro- 

 ducing about the same amount of butter-fat, and the roughage 

 of their ration consisted for the most part of freshly-cut soy- 

 beans, very rich in carotin and xanthophylls. 



Relative Color Production by Different Individuals 



Cow No. 



Bbebd 



Feed 



Color 



Yellow 



Red 



Light 



59 



34 



208 



Jersey 

 Jersey 

 Holstein 



Fresh green soybeans 



and grain . 

 Fresh green soybeans 



and grain . 

 Fresh green soybeans 



and grain . 



54.0 

 60.0 

 29.0 



2.5 

 2.5 



1.8 



1.0 

 1.0 

 0.5 



When comparing the color of the fat produced by individual 

 members of the Jersey and Holstein breeds under feeding condi- 

 tions favorable for only a moderate amount of color in the fat, 

 the relative color production of the breeds very nearly approaches 

 unity. This is especially true when the fat production and the 

 actual proportion of the ration furnishing the pigments are 

 taken into account. Such a comparison is shown in the follow- 

 ing table : 



