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Some Factors Affecting the Stability of Certain Milk Properties. II. Effect of Succulent Roughages and of Storage Conditions on Color^*

New Jersey Agricultural Experiment Station, New Brunswick, N. J.

ABSTRACT

The results of this study indicate that:

The feeding of properly ensiled molasses grass silage produces a milk higher in total yellow color than does corn silage or beet pulp; corn silage is somewhat superior to beet pulp in this respect.

There is a small but definite progressive loss of total yellow color of milks in storage. This loss is somewhat accelerated by the pasteurizing process and still more by the presence of soluble copper.

The yellow color of high-colored milks is more stable in stored milks and toward catalytic copper than is that of low-colored milks.

The yellow color of milk produced on molasses grass silage is more stable in storage than is that of milk produced on either beet pulp or corn silage.

Apparently less loss of color occurs in Guernsey than in Holstein stored milk.

An hypothesis is advanced that the loss of yellow color in milk is due to deterioration of xanthophyll and zeaxanthin rather than carotene and that these two carotenoids exhibit antioxidative protection toward carotene in butter fat.

The feeding of molasses grass silage appears to be an excellent means of maintaining a comparatively high level of yellow color in milk during winter months.

^* Journal Series paper of the New Jersey Agricultural Experiment Station, department of dairy husbandry.